Re: [PATCH 0/9] ftrace: updates for tip

Steven Rostedt
2009-01-13T16:54:29Z

On Tue, 13 Jan 2009, Steven Rostedt wrote:

>
>
> On Tue, 13 Jan 2009, Steven Rostedt wrote:
>
> >
> > The following patches are in:
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git
> >
> > branch: tip/devel
>
> Ingo,
>
> Don't pull any of this yet please. I'm going to rebase some of the patches
> to fix the change logs (typos). I'll let you know when that's finished.
>

OK, I rebased in changing the change logs. Here's what I did:

s/destinct/distinct/
s/K?nig/Koenig/

Here's the changes:

The following patches are in:

git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git

branch: tip/devel

Frederic Weisbecker (2):
tracing/ftrace: separate events tracing and stats tracing engine
tracing: add a new workqueue tracer

Shaohua Li (6):
ftrace, ia64: make recordmcount distinct module compile
ftrace, ia64: explictly ignore a file in recordmcount.pl
ftrace, ia64: Add macro for ftrace_caller
ftrace, ia64: Add recordmcount for ia64
ftrace, ia64: IA64 static ftrace support
ftrace, ia64: IA64 dynamic ftrace support

Uwe Kleine-Koenig (1):
ftrace, trivial: fix typo "resgister" -> "register"

----
arch/ia64/Kconfig | 3 +
arch/ia64/include/asm/ftrace.h | 28 ++++
arch/ia64/kernel/Makefile | 5 +
arch/ia64/kernel/entry.S | 100 ++++++++++++++
arch/ia64/kernel/ftrace.c | 206 ++++++++++++++++++++++++++++
arch/ia64/kernel/ia64_ksyms.c | 6 +
include/linux/ftrace.h | 4 +
include/trace/workqueue.h | 25 ++++
kernel/trace/Kconfig | 11 ++
kernel/trace/Makefile | 1 +
kernel/trace/ftrace.c | 14 +--
kernel/trace/trace.c | 2 -
kernel/trace/trace.h | 20 ---
kernel/trace/trace_branch.c | 108 +++++++++-------
kernel/trace/trace_stat.c | 191 +++++++++++---------------
kernel/trace/trace_stat.h | 31 +++++
kernel/trace/trace_workqueue.c | 287 ++++++++++++++++++++++++++++++++++++++++
kernel/workqueue.c | 16 ++-
scripts/Makefile.build | 13 +-
scripts/recordmcount.pl | 18 ++-
20 files changed, 888 insertions(+), 201 deletions(-)
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 3d31636..e20c1d4 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -21,6 +21,9 @@ config IA64
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
+ select HAVE_FTRACE_MCOUNT_RECORD
+ select HAVE_DYNAMIC_FTRACE if (!ITANIUM)
+ select HAVE_FUNCTION_TRACER
select HAVE_DMA_ATTRS
select HAVE_KVM
select HAVE_ARCH_TRACEHOOK
diff --git a/arch/ia64/include/asm/ftrace.h b/arch/ia64/include/asm/ftrace.h
new file mode 100644
index 0000000..d20db3c
--- /dev/null
+++ b/arch/ia64/include/asm/ftrace.h
@@ -0,0 +1,28 @@
+#ifndef _ASM_IA64_FTRACE_H
+#define _ASM_IA64_FTRACE_H
+
+#ifdef CONFIG_FUNCTION_TRACER
+#define MCOUNT_INSN_SIZE 32 /* sizeof mcount call */
+
+#ifndef __ASSEMBLY__
+extern void _mcount(unsigned long pfs, unsigned long r1, unsigned long b0, unsigned long r0);
+#define mcount _mcount
+
+#include <asm/kprobes.h>
+/* In IA64, MCOUNT_ADDR is set in link time, so it's not a constant at compile time */
+#define MCOUNT_ADDR (((struct fnptr *)mcount)->ip)
+#define FTRACE_ADDR (((struct fnptr *)ftrace_caller)->ip)
+
+static inline unsigned long ftrace_call_adjust(unsigned long addr)
+{
+ /* second bundle, insn 2 */
+ return addr - 0x12;
+}
+
+struct dyn_arch_ftrace {
+};
+#endif
+
+#endif /* CONFIG_FUNCTION_TRACER */
+
+#endif /* _ASM_IA64_FTRACE_H */
diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile
index f2778f2..dc62df0 100644
--- a/arch/ia64/kernel/Makefile
+++ b/arch/ia64/kernel/Makefile
@@ -2,6 +2,10 @@
# Makefile for the linux kernel.
#

+ifdef CONFIG_DYNAMIC_FTRACE
+CFLAGS_REMOVE_ftrace.o = -pg
+endif
+
extra-y := head.o init_task.o vmlinux.lds

obj-y := acpi.o entry.o efi.o efi_stub.o gate-data.o fsys.o ia64_ksyms.o irq.o irq_ia64.o \
@@ -28,6 +32,7 @@ obj-$(CONFIG_IA64_CYCLONE) += cyclone.o
obj-$(CONFIG_CPU_FREQ) += cpufreq/
obj-$(CONFIG_IA64_MCA_RECOVERY) += mca_recovery.o
obj-$(CONFIG_KPROBES) += kprobes.o jprobes.o
+obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o
obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o crash.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR) += uncached.o
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index d435f4a..e0be92a 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -47,6 +47,7 @@
#include <asm/processor.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
+#include <asm/ftrace.h>

#include "minstate.h"

@@ -1404,6 +1405,105 @@ GLOBAL_ENTRY(unw_init_running)
br.ret.sptk.many rp
END(unw_init_running)

+#ifdef CONFIG_FUNCTION_TRACER
+#ifdef CONFIG_DYNAMIC_FTRACE
+GLOBAL_ENTRY(_mcount)
+ br ftrace_stub
+END(_mcount)
+
+.here:
+ br.ret.sptk.many b0
+
+GLOBAL_ENTRY(ftrace_caller)
+ alloc out0 = ar.pfs, 8, 0, 4, 0
+ mov out3 = r0
+ ;;
+ mov out2 = b0
+ add r3 = 0x20, r3
+ mov out1 = r1;
+ br.call.sptk.many b0 = ftrace_patch_gp
+ //this might be called from module, so we must patch gp
+ftrace_patch_gp:
+ movl gp=__gp
+ mov b0 = r3
+ ;;
+.global ftrace_call;
+ftrace_call:
+{
+ .mlx
+ nop.m 0x0
+ movl r3 = .here;;
+}
+ alloc loc0 = ar.pfs, 4, 4, 2, 0
+ ;;
+ mov loc1 = b0
+ mov out0 = b0
+ mov loc2 = r8
+ mov loc3 = r15
+ ;;
+ adds out0 = -MCOUNT_INSN_SIZE, out0
+ mov out1 = in2
+ mov b6 = r3
+
+ br.call.sptk.many b0 = b6
+ ;;
+ mov ar.pfs = loc0
+ mov b0 = loc1
+ mov r8 = loc2
+ mov r15 = loc3
+ br ftrace_stub
+ ;;
+END(ftrace_caller)
+
+#else
+GLOBAL_ENTRY(_mcount)
+ movl r2 = ftrace_stub
+ movl r3 = ftrace_trace_function;;
+ ld8 r3 = [r3];;
+ ld8 r3 = [r3];;
+ cmp.eq p7,p0 = r2, r3
+(p7) br.sptk.many ftrace_stub
+ ;;
+
+ alloc loc0 = ar.pfs, 4, 4, 2, 0
+ ;;
+ mov loc1 = b0
+ mov out0 = b0
+ mov loc2 = r8
+ mov loc3 = r15
+ ;;
+ adds out0 = -MCOUNT_INSN_SIZE, out0
+ mov out1 = in2
+ mov b6 = r3
+
+ br.call.sptk.many b0 = b6
+ ;;
+ mov ar.pfs = loc0
+ mov b0 = loc1
+ mov r8 = loc2
+ mov r15 = loc3
+ br ftrace_stub
+ ;;
+END(_mcount)
+#endif
+
+GLOBAL_ENTRY(ftrace_stub)
+ mov r3 = b0
+ movl r2 = _mcount_ret_helper
+ ;;
+ mov b6 = r2
+ mov b7 = r3
+ br.ret.sptk.many b6
+
+_mcount_ret_helper:
+ mov b0 = r42
+ mov r1 = r41
+ mov ar.pfs = r40
+ br b7
+END(ftrace_stub)
+
+#endif /* CONFIG_FUNCTION_TRACER */
+
.rodata
.align 8
.globl sys_call_table
diff --git a/arch/ia64/kernel/ftrace.c b/arch/ia64/kernel/ftrace.c
new file mode 100644
index 0000000..7fc8c96
--- /dev/null
+++ b/arch/ia64/kernel/ftrace.c
@@ -0,0 +1,206 @@
+/*
+ * Dynamic function tracing support.
+ *
+ * Copyright (C) 2008 Shaohua Li <shaohua.li@intel.com>
+ *
+ * For licencing details, see COPYING.
+ *
+ * Defines low-level handling of mcount calls when the kernel
+ * is compiled with the -pg flag. When using dynamic ftrace, the
+ * mcount call-sites get patched lazily with NOP till they are
+ * enabled. All code mutation routines here take effect atomically.
+ */
+
+#include <linux/uaccess.h>
+#include <linux/ftrace.h>
+
+#include <asm/cacheflush.h>
+#include <asm/patch.h>
+
+/* In IA64, each function will be added below two bundles with -pg option */
+static unsigned char __attribute__((aligned(8)))
+ftrace_orig_code[MCOUNT_INSN_SIZE] = {
+ 0x02, 0x40, 0x31, 0x10, 0x80, 0x05, /* alloc r40=ar.pfs,12,8,0 */
+ 0xb0, 0x02, 0x00, 0x00, 0x42, 0x40, /* mov r43=r0;; */
+ 0x05, 0x00, 0xc4, 0x00, /* mov r42=b0 */
+ 0x11, 0x48, 0x01, 0x02, 0x00, 0x21, /* mov r41=r1 */
+ 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, /* nop.i 0x0 */
+ 0x08, 0x00, 0x00, 0x50 /* br.call.sptk.many b0 = _mcount;; */
+};
+
+struct ftrace_orig_insn {
+ u64 dummy1, dummy2, dummy3;
+ u64 dummy4:64-41+13;
+ u64 imm20:20;
+ u64 dummy5:3;
+ u64 sign:1;
+ u64 dummy6:4;
+};
+
+/* mcount stub will be converted below for nop */
+static unsigned char ftrace_nop_code[MCOUNT_INSN_SIZE] = {
+ 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MII] nop.m 0x0 */
+ 0x30, 0x00, 0x00, 0x60, 0x00, 0x00, /* mov r3=ip */
+ 0x00, 0x00, 0x04, 0x00, /* nop.i 0x0 */
+ 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0x0 */
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* nop.x 0x0;; */
+ 0x00, 0x00, 0x04, 0x00
+};
+
+static unsigned char *ftrace_nop_replace(void)
+{
+ return ftrace_nop_code;
+}
+
+/*
+ * mcount stub will be converted below for call
+ * Note: Just the last instruction is changed against nop
+ * */
+static unsigned char __attribute__((aligned(8)))
+ftrace_call_code[MCOUNT_INSN_SIZE] = {
+ 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MII] nop.m 0x0 */
+ 0x30, 0x00, 0x00, 0x60, 0x00, 0x00, /* mov r3=ip */
+ 0x00, 0x00, 0x04, 0x00, /* nop.i 0x0 */
+ 0x05, 0x00, 0x00, 0x00, 0x01, 0x00, /* [MLX] nop.m 0x0 */
+ 0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, /* brl.many .;;*/
+ 0xf8, 0xff, 0xff, 0xc8
+};
+
+struct ftrace_call_insn {
+ u64 dummy1, dummy2;
+ u64 dummy3:48;
+ u64 imm39_l:16;
+ u64 imm39_h:23;
+ u64 dummy4:13;
+ u64 imm20:20;
+ u64 dummy5:3;
+ u64 i:1;
+ u64 dummy6:4;
+};
+
+static unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)
+{
+ struct ftrace_call_insn *code = (void *)ftrace_call_code;
+ unsigned long offset = addr - (ip + 0x10);
+
+ code->imm39_l = offset >> 24;
+ code->imm39_h = offset >> 40;
+ code->imm20 = offset >> 4;
+ code->i = offset >> 63;
+ return ftrace_call_code;
+}
+
+static int
+ftrace_modify_code(unsigned long ip, unsigned char *old_code,
+ unsigned char *new_code, int do_check)
+{
+ unsigned char replaced[MCOUNT_INSN_SIZE];
+
+ /*
+ * Note: Due to modules and __init, code can
+ * disappear and change, we need to protect against faulting
+ * as well as code changing. We do this by using the
+ * probe_kernel_* functions.
+ *
+ * No real locking needed, this code is run through
+ * kstop_machine, or before SMP starts.
+ */
+
+ if (!do_check)
+ goto skip_check;
+
+ /* read the text we want to modify */
+ if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+ return -EFAULT;
+
+ /* Make sure it is what we expect it to be */
+ if (memcmp(replaced, old_code, MCOUNT_INSN_SIZE) != 0)
+ return -EINVAL;
+
+skip_check:
+ /* replace the text with the new text */
+ if (probe_kernel_write(((void *)ip), new_code, MCOUNT_INSN_SIZE))
+ return -EPERM;
+ flush_icache_range(ip, ip + MCOUNT_INSN_SIZE);
+
+ return 0;
+}
+
+static int ftrace_make_nop_check(struct dyn_ftrace *rec, unsigned long addr)
+{
+ unsigned char __attribute__((aligned(8))) replaced[MCOUNT_INSN_SIZE];
+ unsigned long ip = rec->ip;
+
+ if (probe_kernel_read(replaced, (void *)ip, MCOUNT_INSN_SIZE))
+ return -EFAULT;
+ if (rec->flags & FTRACE_FL_CONVERTED) {
+ struct ftrace_call_insn *call_insn, *tmp_call;
+
+ call_insn = (void *)ftrace_call_code;
+ tmp_call = (void *)replaced;
+ call_insn->imm39_l = tmp_call->imm39_l;
+ call_insn->imm39_h = tmp_call->imm39_h;
+ call_insn->imm20 = tmp_call->imm20;
+ call_insn->i = tmp_call->i;
+ if (memcmp(replaced, ftrace_call_code, MCOUNT_INSN_SIZE) != 0)
+ return -EINVAL;
+ return 0;
+ } else {
+ struct ftrace_orig_insn *call_insn, *tmp_call;
+
+ call_insn = (void *)ftrace_orig_code;
+ tmp_call = (void *)replaced;
+ call_insn->sign = tmp_call->sign;
+ call_insn->imm20 = tmp_call->imm20;
+ if (memcmp(replaced, ftrace_orig_code, MCOUNT_INSN_SIZE) != 0)
+ return -EINVAL;
+ return 0;
+ }
+}
+
+int ftrace_make_nop(struct module *mod,
+ struct dyn_ftrace *rec, unsigned long addr)
+{
+ int ret;
+ char *new;
+
+ ret = ftrace_make_nop_check(rec, addr);
+ if (ret)
+ return ret;
+ new = ftrace_nop_replace();
+ return ftrace_modify_code(rec->ip, NULL, new, 0);
+}
+
+int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+{
+ unsigned long ip = rec->ip;
+ unsigned char *old, *new;
+
+ old= ftrace_nop_replace();
+ new = ftrace_call_replace(ip, addr);
+ return ftrace_modify_code(ip, old, new, 1);
+}
+
+/* in IA64, _mcount can't directly call ftrace_stub. Only jump is ok */
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+ unsigned long ip;
+ unsigned long addr = ((struct fnptr *)ftrace_call)->ip;
+
+ if (func == ftrace_stub)
+ return 0;
+ ip = ((struct fnptr *)func)->ip;
+
+ ia64_patch_imm64(addr + 2, ip);
+
+ flush_icache_range(addr, addr + 16);
+ return 0;
+}
+
+/* run from kstop_machine */
+int __init ftrace_dyn_arch_init(void *data)
+{
+ *(unsigned long *)data = 0;
+
+ return 0;
+}
diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c
index 6da1f20..2d31186 100644
--- a/arch/ia64/kernel/ia64_ksyms.c
+++ b/arch/ia64/kernel/ia64_ksyms.c
@@ -112,3 +112,9 @@ EXPORT_SYMBOL_GPL(esi_call_phys);
#endif
extern char ia64_ivt[];
EXPORT_SYMBOL(ia64_ivt);
+
+#include <asm/ftrace.h>
+#ifdef CONFIG_FUNCTION_TRACER
+/* mcount is defined in assembly */
+EXPORT_SYMBOL(_mcount);
+#endif
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 677432b..0547214 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -126,6 +126,10 @@ extern int ftrace_update_ftrace_func(ftrace_func_t func);
extern void ftrace_caller(void);
extern void ftrace_call(void);
extern void mcount_call(void);
+
+#ifndef FTRACE_ADDR
+#define FTRACE_ADDR ((unsigned long)ftrace_caller)
+#endif
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
extern void ftrace_graph_caller(void);
extern int ftrace_enable_ftrace_graph_caller(void);
diff --git a/include/trace/workqueue.h b/include/trace/workqueue.h
new file mode 100644
index 0000000..867829d
--- /dev/null
+++ b/include/trace/workqueue.h
@@ -0,0 +1,25 @@
+#ifndef __TRACE_WORKQUEUE_H
+#define __TRACE_WORKQUEUE_H
+
+#include <linux/tracepoint.h>
+#include <linux/workqueue.h>
+#include <linux/sched.h>
+
+DECLARE_TRACE(workqueue_insertion,
+ TPPROTO(struct task_struct *wq_thread, struct work_struct *work),
+ TPARGS(wq_thread, work));
+
+DECLARE_TRACE(workqueue_execution,
+ TPPROTO(struct task_struct *wq_thread, struct work_struct *work),
+ TPARGS(wq_thread, work));
+
+/* Trace the creation of one workqueue thread on a cpu */
+DECLARE_TRACE(workqueue_creation,
+ TPPROTO(struct task_struct *wq_thread, int cpu),
+ TPARGS(wq_thread, cpu));
+
+DECLARE_TRACE(workqueue_destruction,
+ TPPROTO(struct task_struct *wq_thread),
+ TPARGS(wq_thread));
+
+#endif /* __TRACE_WORKQUEUE_H */
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 9442392..dde1d46 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -284,6 +284,17 @@ config KMEMTRACE

If unsure, say N.

+config WORKQUEUE_TRACER
+ bool "Trace workqueues"
+ select TRACING
+ help
+ The workqueue tracer provides some statistical informations
+ about each cpu workqueue thread such as the number of the
+ works inserted and executed since their creation. It can help
+ to evaluate the amount of work each of them have to perform.
+ For example it can help a developer to decide whether he should
+ choose a per cpu workqueue instead of a singlethreaded one.
+

config DYNAMIC_FTRACE
bool "enable/disable ftrace tracepoints dynamically"
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 05c9182..f76d48f 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -36,5 +36,6 @@ obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
obj-$(CONFIG_POWER_TRACER) += trace_power.o
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
+obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o

libftrace-y := ftrace.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 9e54a6c..8c1c9c0 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -263,14 +263,6 @@ static void ftrace_update_pid_func(void)
# error Dynamic ftrace depends on MCOUNT_RECORD
#endif

-/*
- * Since MCOUNT_ADDR may point to mcount itself, we do not want
- * to get it confused by reading a reference in the code as we
- * are parsing on objcopy output of text. Use a variable for
- * it instead.
- */
-static unsigned long mcount_addr = MCOUNT_ADDR;
-
enum {
FTRACE_ENABLE_CALLS = (1 << 0),
FTRACE_DISABLE_CALLS = (1 << 1),
@@ -463,7 +455,7 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
unsigned long ip, fl;
unsigned long ftrace_addr;

- ftrace_addr = (unsigned long)ftrace_caller;
+ ftrace_addr = (unsigned long)FTRACE_ADDR;

ip = rec->ip;

@@ -575,7 +567,7 @@ ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)

ip = rec->ip;

- ret = ftrace_make_nop(mod, rec, mcount_addr);
+ ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
if (ret) {
ftrace_bug(ret, ip);
rec->flags |= FTRACE_FL_FAILED;
@@ -1902,7 +1894,7 @@ int register_ftrace_function(struct ftrace_ops *ops)
}

/**
- * unregister_ftrace_function - unresgister a function for profiling.
+ * unregister_ftrace_function - unregister a function for profiling.
* @ops - ops structure that holds the function to unregister
*
* Unregister a function that was added to be called by ftrace profiling.
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0418fc3..40217fb 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2353,7 +2353,6 @@ static int tracing_set_tracer(char *buf)
if (ret)
goto out;
}
- init_tracer_stat(t);

trace_branch_enable(tr);
out:
@@ -3218,7 +3217,6 @@ __init static int tracer_alloc_buffers(void)
#else
current_trace = &nop_trace;
#endif
- init_tracer_stat(current_trace);
/* All seems OK, enable tracing */
tracing_disabled = 0;

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index b3f9ad1..79c8721 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -334,24 +334,6 @@ struct tracer_flags {
/* Makes more easy to define a tracer opt */
#define TRACER_OPT(s, b) .name = #s, .bit = b

-/*
- * If you want to provide a stat file (one-shot statistics), fill
- * an iterator with stat_start/stat_next and a stat_show callbacks.
- * The others callbacks are optional.
- */
-struct tracer_stat {
- /* The name of your stat file */
- const char *name;
- /* Iteration over statistic entries */
- void *(*stat_start)(void);
- void *(*stat_next)(void *prev, int idx);
- /* Compare two entries for sorting (optional) for stats */
- int (*stat_cmp)(void *p1, void *p2);
- /* Print a stat entry */
- int (*stat_show)(struct seq_file *s, void *p);
- /* Print the headers of your stat entries */
- int (*stat_headers)(struct seq_file *s);
-};

/*
* A specific tracer, represented by methods that operate on a trace array:
@@ -466,8 +448,6 @@ void tracing_start_sched_switch_record(void);
int register_tracer(struct tracer *type);
void unregister_tracer(struct tracer *type);

-void init_tracer_stat(struct tracer *trace);
-
extern unsigned long nsecs_to_usecs(unsigned long nsecs);

extern unsigned long tracing_max_latency;
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index da5cf3e..ca017e0 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -16,12 +16,12 @@
#include <asm/local.h>

#include "trace.h"
+#include "trace_stat.h"
#include "trace_output.h"

-static struct tracer branch_trace;
-
#ifdef CONFIG_BRANCH_TRACER

+static struct tracer branch_trace;
static int branch_tracing_enabled __read_mostly;
static DEFINE_MUTEX(branch_tracing_mutex);

@@ -191,6 +191,30 @@ static struct trace_event trace_branch_event = {
.binary = trace_nop_print,
};

+static struct tracer branch_trace __read_mostly =
+{
+ .name = "branch",
+ .init = branch_trace_init,
+ .reset = branch_trace_reset,
+#ifdef CONFIG_FTRACE_SELFTEST
+ .selftest = trace_selftest_startup_branch,
+#endif /* CONFIG_FTRACE_SELFTEST */
+};
+
+__init static int init_branch_tracer(void)
+{
+ int ret;
+
+ ret = register_ftrace_event(&trace_branch_event);
+ if (!ret) {
+ printk(KERN_WARNING "Warning: could not register "
+ "branch events\n");
+ return 1;
+ }
+ return register_tracer(&branch_trace);
+}
+device_initcall(init_branch_tracer);
+
#else
static inline
void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
@@ -305,6 +329,29 @@ static int annotated_branch_stat_cmp(void *p1, void *p2)
return 0;
}

+static struct tracer_stat annotated_branch_stats = {
+ .name = "branch_annotated",
+ .stat_start = annotated_branch_stat_start,
+ .stat_next = annotated_branch_stat_next,
+ .stat_cmp = annotated_branch_stat_cmp,
+ .stat_headers = annotated_branch_stat_headers,
+ .stat_show = branch_stat_show
+};
+
+__init static int init_annotated_branch_stats(void)
+{
+ int ret;
+
+ ret = register_stat_tracer(&annotated_branch_stats);
+ if (!ret) {
+ printk(KERN_WARNING "Warning: could not register "
+ "annotated branches stats\n");
+ return 1;
+ }
+ return 0;
+}
+fs_initcall(init_annotated_branch_stats);
+
#ifdef CONFIG_PROFILE_ALL_BRANCHES

extern unsigned long __start_branch_profile[];
@@ -339,60 +386,25 @@ all_branch_stat_next(void *v, int idx)
return p;
}

-static struct tracer_stat branch_stats[] = {
- {.name = "annotated",
- .stat_start = annotated_branch_stat_start,
- .stat_next = annotated_branch_stat_next,
- .stat_cmp = annotated_branch_stat_cmp,
- .stat_headers = annotated_branch_stat_headers,
- .stat_show = branch_stat_show},
-
- {.name = "all",
+static struct tracer_stat all_branch_stats = {
+ .name = "branch_all",
.stat_start = all_branch_stat_start,
.stat_next = all_branch_stat_next,
.stat_headers = all_branch_stat_headers,
- .stat_show = branch_stat_show},
-
- { }
-};
-#else
-static struct tracer_stat branch_stats[] = {
- {.name = "annotated",
- .stat_start = annotated_branch_stat_start,
- .stat_next = annotated_branch_stat_next,
- .stat_cmp = annotated_branch_stat_cmp,
- .stat_headers = annotated_branch_stat_headers,
- .stat_show = branch_stat_show},
-
- { }
+ .stat_show = branch_stat_show
};
-#endif /* CONFIG_PROFILE_ALL_BRANCHES */

-
-static struct tracer branch_trace __read_mostly =
+__init static int all_annotated_branch_stats(void)
{
- .name = "branch",
-#ifdef CONFIG_BRANCH_TRACER
- .init = branch_trace_init,
- .reset = branch_trace_reset,
-#ifdef CONFIG_FTRACE_SELFTEST
- .selftest = trace_selftest_startup_branch,
-#endif /* CONFIG_FTRACE_SELFTEST */
-#endif
- .stats = branch_stats
-};
-
-__init static int init_branch_trace(void)
-{
-#ifdef CONFIG_BRANCH_TRACER
int ret;
- ret = register_ftrace_event(&trace_branch_event);
+
+ ret = register_stat_tracer(&all_branch_stats);
if (!ret) {
- printk(KERN_WARNING "Warning: could not register branch events\n");
+ printk(KERN_WARNING "Warning: could not register "
+ "all branches stats\n");
return 1;
}
-#endif
-
- return register_tracer(&branch_trace);
+ return 0;
}
-device_initcall(init_branch_trace);
+fs_initcall(all_annotated_branch_stats);
+#endif /* CONFIG_PROFILE_ALL_BRANCHES */
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 1515f9e..cb29282 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -10,28 +10,32 @@

#include <linux/list.h>
-#include <linux/seq_file.h>
#include <linux/debugfs.h>
+#include "trace_stat.h"
#include "trace.h"

/* List of stat entries from a tracer */
struct trace_stat_list {
- struct list_head list;
- void *stat;
+ struct list_head list;
+ void *stat;
};

/* A stat session is the stats output in one file */
struct tracer_stat_session {
- struct tracer_stat *ts;
- struct list_head stat_list;
- struct mutex stat_mutex;
+ struct list_head session_list;
+ struct tracer_stat *ts;
+ struct list_head stat_list;
+ struct mutex stat_mutex;
+ struct dentry *file;
};

/* All of the sessions currently in use. Each stat file embeed one session */
-static struct tracer_stat_session **all_stat_sessions;
-static int nb_sessions;
-static struct dentry *stat_dir, **stat_files;
+static LIST_HEAD(all_stat_sessions);
+static DEFINE_MUTEX(all_stat_sessions_mutex);
+
+/* The root directory for all stat files */
+static struct dentry *stat_dir;

static void reset_stat_session(struct tracer_stat_session *session)
@@ -44,66 +48,77 @@ static void reset_stat_session(struct tracer_stat_session *session)
INIT_LIST_HEAD(&session->stat_list);
}

-/* Called when a tracer is initialized */
-static int init_all_sessions(int nb, struct tracer_stat *ts)
+static void destroy_session(struct tracer_stat_session *session)
{
- int i, j;
- struct tracer_stat_session *session;
+ debugfs_remove(session->file);
+ reset_stat_session(session);
+ mutex_destroy(&session->stat_mutex);
+ kfree(session);
+}

- nb_sessions = 0;

- if (all_stat_sessions) {
- for (i = 0; i < nb_sessions; i++) {
- session = all_stat_sessions[i];
- reset_stat_session(session);
- mutex_destroy(&session->stat_mutex);
- kfree(session);
- }
- }
- all_stat_sessions = kmalloc(sizeof(struct tracer_stat_session *) * nb,
- GFP_KERNEL);
- if (!all_stat_sessions)
- return -ENOMEM;
+static int init_stat_file(struct tracer_stat_session *session);

- for (i = 0; i < nb; i++) {
- session = kmalloc(sizeof(struct tracer_stat_session) * nb,
- GFP_KERNEL);
- if (!session)
- goto free_sessions;
+int register_stat_tracer(struct tracer_stat *trace)
+{
+ struct tracer_stat_session *session, *node, *tmp;
+ int ret;
+
+ if (!trace)
+ return -EINVAL;
+
+ if (!trace->stat_start || !trace->stat_next || !trace->stat_show)
+ return -EINVAL;

- INIT_LIST_HEAD(&session->stat_list);
- mutex_init(&session->stat_mutex);
- session->ts = &ts[i];
- all_stat_sessions[i] = session;
+ /* Already registered? */
+ mutex_lock(&all_stat_sessions_mutex);
+ list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+ if (node->ts == trace)
+ return -EINVAL;
}
- nb_sessions = nb;
- return 0;
+ mutex_unlock(&all_stat_sessions_mutex);
+
+ /* Init the session */
+ session = kmalloc(sizeof(struct tracer_stat_session), GFP_KERNEL);
+ if (!session)
+ return -ENOMEM;

-free_sessions:
+ session->ts = trace;
+ INIT_LIST_HEAD(&session->session_list);
+ INIT_LIST_HEAD(&session->stat_list);
+ mutex_init(&session->stat_mutex);
+ session->file = NULL;

- for (j = 0; j < i; j++)
- kfree(all_stat_sessions[i]);
+ ret = init_stat_file(session);
+ if (ret) {
+ destroy_session(session);
+ return ret;
+ }

- kfree(all_stat_sessions);
- all_stat_sessions = NULL;
+ /* Register */
+ mutex_lock(&all_stat_sessions_mutex);
+ list_add_tail(&session->session_list, &all_stat_sessions);
+ mutex_unlock(&all_stat_sessions_mutex);

- return -ENOMEM;
+ return 0;
}

-static int basic_tracer_stat_checks(struct tracer_stat *ts)
+void unregister_stat_tracer(struct tracer_stat *trace)
{
- int i;
+ struct tracer_stat_session *node, *tmp;

- if (!ts)
- return 0;
-
- for (i = 0; ts[i].name; i++) {
- if (!ts[i].stat_start || !ts[i].stat_next || !ts[i].stat_show)
- return -EBUSY;
+ mutex_lock(&all_stat_sessions_mutex);
+ list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+ if (node->ts == trace) {
+ list_del(&node->session_list);
+ destroy_session(node);
+ break;
+ }
}
- return i;
+ mutex_unlock(&all_stat_sessions_mutex);
}

+
/*
* For tracers that don't provide a stat_cmp callback.
* This one will force an immediate insertion on tail of
@@ -280,63 +295,7 @@ static const struct file_operations tracing_stat_fops = {
.release = tracing_stat_release
};

-
-static void destroy_trace_stat_files(void)
-{
- int i;
-
- if (stat_files) {
- for (i = 0; i < nb_sessions; i++)
- debugfs_remove(stat_files[i]);
- kfree(stat_files);
- stat_files = NULL;
- }
-}
-
-static void init_trace_stat_files(void)
-{
- int i;
-
- if (!stat_dir || !nb_sessions)
- return;
-
- stat_files = kmalloc(sizeof(struct dentry *) * nb_sessions, GFP_KERNEL);
-
- if (!stat_files) {
- pr_warning("trace stat: not enough memory\n");
- return;
- }
-
- for (i = 0; i < nb_sessions; i++) {
- struct tracer_stat_session *session = all_stat_sessions[i];
- stat_files[i] = debugfs_create_file(session->ts->name, 0644,
- stat_dir,
- session, &tracing_stat_fops);
- if (!stat_files[i])
- pr_warning("cannot create %s entry\n",
- session->ts->name);
- }
-}
-
-void init_tracer_stat(struct tracer *trace)
-{
- int nb = basic_tracer_stat_checks(trace->stats);
-
- destroy_trace_stat_files();
-
- if (nb < 0) {
- pr_warning("stat tracing: missing stat callback on %s\n",
- trace->name);
- return;
- }
- if (!nb)
- return;
-
- init_all_sessions(nb, trace->stats);
- init_trace_stat_files();
-}
-
-static int __init tracing_stat_init(void)
+static int tracing_stat_init(void)
{
struct dentry *d_tracing;

@@ -348,4 +307,16 @@ static int __init tracing_stat_init(void)
"'trace_stat' entry\n");
return 0;
}
-fs_initcall(tracing_stat_init);
+
+static int init_stat_file(struct tracer_stat_session *session)
+{
+ if (!stat_dir && tracing_stat_init())
+ return -ENODEV;
+
+ session->file = debugfs_create_file(session->ts->name, 0644,
+ stat_dir,
+ session, &tracing_stat_fops);
+ if (!session->file)
+ return -ENOMEM;
+ return 0;
+}
diff --git a/kernel/trace/trace_stat.h b/kernel/trace/trace_stat.h
new file mode 100644
index 0000000..202274c
--- /dev/null
+++ b/kernel/trace/trace_stat.h
@@ -0,0 +1,31 @@
+#ifndef __TRACE_STAT_H
+#define __TRACE_STAT_H
+
+#include <linux/seq_file.h>
+
+/*
+ * If you want to provide a stat file (one-shot statistics), fill
+ * an iterator with stat_start/stat_next and a stat_show callbacks.
+ * The others callbacks are optional.
+ */
+struct tracer_stat {
+ /* The name of your stat file */
+ const char *name;
+ /* Iteration over statistic entries */
+ void *(*stat_start)(void);
+ void *(*stat_next)(void *prev, int idx);
+ /* Compare two entries for stats sorting */
+ int (*stat_cmp)(void *p1, void *p2);
+ /* Print a stat entry */
+ int (*stat_show)(struct seq_file *s, void *p);
+ /* Print the headers of your stat entries */
+ int (*stat_headers)(struct seq_file *s);
+};
+
+/*
+ * Destroy or create a stat file
+ */
+extern int register_stat_tracer(struct tracer_stat *trace);
+extern void unregister_stat_tracer(struct tracer_stat *trace);
+
+#endif /* __TRACE_STAT_H */
diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
new file mode 100644
index 0000000..f8118d3
--- /dev/null
+++ b/kernel/trace/trace_workqueue.c
@@ -0,0 +1,287 @@
+/*
+ * Workqueue statistical tracer.
+ *
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ */
+
+
+#include <trace/workqueue.h>
+#include <linux/list.h>
+#include "trace_stat.h"
+#include "trace.h"
+
+
+/* A cpu workqueue thread */
+struct cpu_workqueue_stats {
+ struct list_head list;
+/* Useful to know if we print the cpu headers */
+ bool first_entry;
+ int cpu;
+ pid_t pid;
+/* Can be inserted from interrupt or user context, need to be atomic */
+ atomic_t inserted;
+/*
+ * Don't need to be atomic, works are serialized in a single workqueue thread
+ * on a single CPU.
+ */
+ unsigned int executed;
+};
+
+/* List of workqueue threads on one cpu */
+struct workqueue_global_stats {
+ struct list_head list;
+ spinlock_t lock;
+};
+
+/* Don't need a global lock because allocated before the workqueues, and
+ * never freed.
+ */
+static struct workqueue_global_stats *all_workqueue_stat;
+
+/* Insertion of a work */
+static void
+probe_workqueue_insertion(struct task_struct *wq_thread,
+ struct work_struct *work)
+{
+ int cpu = cpumask_first(&wq_thread->cpus_allowed);
+ struct cpu_workqueue_stats *node, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+ list_for_each_entry_safe(node, next, &all_workqueue_stat[cpu].list,
+ list) {
+ if (node->pid == wq_thread->pid) {
+ atomic_inc(&node->inserted);
+ goto found;
+ }
+ }
+ pr_debug("trace_workqueue: entry not found\n");
+found:
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+}
+
+/* Execution of a work */
+static void
+probe_workqueue_execution(struct task_struct *wq_thread,
+ struct work_struct *work)
+{
+ int cpu = cpumask_first(&wq_thread->cpus_allowed);
+ struct cpu_workqueue_stats *node, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+ list_for_each_entry_safe(node, next, &all_workqueue_stat[cpu].list,
+ list) {
+ if (node->pid == wq_thread->pid) {
+ node->executed++;
+ goto found;
+ }
+ }
+ pr_debug("trace_workqueue: entry not found\n");
+found:
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+}
+
+/* Creation of a cpu workqueue thread */
+static void probe_workqueue_creation(struct task_struct *wq_thread, int cpu)
+{
+ struct cpu_workqueue_stats *cws;
+ unsigned long flags;
+
+ WARN_ON(cpu < 0 || cpu >= num_possible_cpus());
+
+ /* Workqueues are sometimes created in atomic context */
+ cws = kzalloc(sizeof(struct cpu_workqueue_stats), GFP_ATOMIC);
+ if (!cws) {
+ pr_warning("trace_workqueue: not enough memory\n");
+ return;
+ }
+ tracing_record_cmdline(wq_thread);
+
+ INIT_LIST_HEAD(&cws->list);
+ cws->cpu = cpu;
+
+ cws->pid = wq_thread->pid;
+
+ spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+ if (list_empty(&all_workqueue_stat[cpu].list))
+ cws->first_entry = true;
+ list_add_tail(&cws->list, &all_workqueue_stat[cpu].list);
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+}
+
+/* Destruction of a cpu workqueue thread */
+static void probe_workqueue_destruction(struct task_struct *wq_thread)
+{
+ /* Workqueue only execute on one cpu */
+ int cpu = cpumask_first(&wq_thread->cpus_allowed);
+ struct cpu_workqueue_stats *node, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+ list_for_each_entry_safe(node, next, &all_workqueue_stat[cpu].list,
+ list) {
+ if (node->pid == wq_thread->pid) {
+ list_del(&node->list);
+ kfree(node);
+ goto found;
+ }
+ }
+
+ pr_debug("trace_workqueue: don't find workqueue to destroy\n");
+found:
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+
+}
+
+static struct cpu_workqueue_stats *workqueue_stat_start_cpu(int cpu)
+{
+ unsigned long flags;
+ struct cpu_workqueue_stats *ret = NULL;
+
+
+ spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+
+ if (!list_empty(&all_workqueue_stat[cpu].list))
+ ret = list_entry(all_workqueue_stat[cpu].list.next,
+ struct cpu_workqueue_stats, list);
+
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+
+ return ret;
+}
+
+static void *workqueue_stat_start(void)
+{
+ int cpu;
+ void *ret = NULL;
+
+ for_each_possible_cpu(cpu) {
+ ret = workqueue_stat_start_cpu(cpu);
+ if (ret)
+ return ret;
+ }
+ return NULL;
+}
+
+static void *workqueue_stat_next(void *prev, int idx)
+{
+ struct cpu_workqueue_stats *prev_cws = prev;
+ int cpu = prev_cws->cpu;
+ unsigned long flags;
+ void *ret = NULL;
+
+ spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+ if (list_is_last(&prev_cws->list, &all_workqueue_stat[cpu].list)) {
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+ for (++cpu ; cpu < num_possible_cpus(); cpu++) {
+ ret = workqueue_stat_start_cpu(cpu);
+ if (ret)
+ return ret;
+ }
+ return NULL;
+ }
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+
+ return list_entry(prev_cws->list.next, struct cpu_workqueue_stats,
+ list);
+}
+
+static int workqueue_stat_show(struct seq_file *s, void *p)
+{
+ struct cpu_workqueue_stats *cws = p;
+ unsigned long flags;
+ int cpu = cws->cpu;
+
+ seq_printf(s, "%3d %6d %6u %s\n", cws->cpu,
+ atomic_read(&cws->inserted),
+ cws->executed,
+ trace_find_cmdline(cws->pid));
+
+ spin_lock_irqsave(&all_workqueue_stat[cpu].lock, flags);
+ if (&cws->list == all_workqueue_stat[cpu].list.next)
+ seq_printf(s, "\n");
+ spin_unlock_irqrestore(&all_workqueue_stat[cpu].lock, flags);
+
+ return 0;
+}
+
+static int workqueue_stat_headers(struct seq_file *s)
+{
+ seq_printf(s, "# CPU INSERTED EXECUTED NAME\n");
+ seq_printf(s, "# | | | |\n\n");
+ return 0;
+}
+
+struct tracer_stat workqueue_stats __read_mostly = {
+ .name = "workqueues",
+ .stat_start = workqueue_stat_start,
+ .stat_next = workqueue_stat_next,
+ .stat_show = workqueue_stat_show,
+ .stat_headers = workqueue_stat_headers
+};
+
+
+int __init stat_workqueue_init(void)
+{
+ if (register_stat_tracer(&workqueue_stats)) {
+ pr_warning("Unable to register workqueue stat tracer\n");
+ return 1;
+ }
+
+ return 0;
+}
+fs_initcall(stat_workqueue_init);
+
+/*
+ * Workqueues are created very early, just after pre-smp initcalls.
+ * So we must register our tracepoints at this stage.
+ */
+int __init trace_workqueue_early_init(void)
+{
+ int ret, cpu;
+
+ ret = register_trace_workqueue_insertion(probe_workqueue_insertion);
+ if (ret)
+ goto out;
+
+ ret = register_trace_workqueue_execution(probe_workqueue_execution);
+ if (ret)
+ goto no_insertion;
+
+ ret = register_trace_workqueue_creation(probe_workqueue_creation);
+ if (ret)
+ goto no_execution;
+
+ ret = register_trace_workqueue_destruction(probe_workqueue_destruction);
+ if (ret)
+ goto no_creation;
+
+ all_workqueue_stat = kmalloc(sizeof(struct workqueue_global_stats)
+ * num_possible_cpus(), GFP_KERNEL);
+
+ if (!all_workqueue_stat) {
+ pr_warning("trace_workqueue: not enough memory\n");
+ goto no_creation;
+ }
+
+ for_each_possible_cpu(cpu) {
+ spin_lock_init(&all_workqueue_stat[cpu].lock);
+ INIT_LIST_HEAD(&all_workqueue_stat[cpu].list);
+ }
+
+ return 0;
+
+no_creation:
+ unregister_trace_workqueue_creation(probe_workqueue_creation);
+no_execution:
+ unregister_trace_workqueue_execution(probe_workqueue_execution);
+no_insertion:
+ unregister_trace_workqueue_insertion(probe_workqueue_insertion);
+out:
+ pr_warning("trace_workqueue: unable to trace workqueues\n");
+
+ return 1;
+}
+early_initcall(trace_workqueue_early_init);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 2f44583..1fc2bc2 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,6 +33,7 @@
#include <linux/kallsyms.h>
#include <linux/debug_locks.h>
#include <linux/lockdep.h>
+#include <trace/workqueue.h>

/*
* The per-CPU workqueue (if single thread, we always use the first
@@ -125,9 +126,13 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
}

+DEFINE_TRACE(workqueue_insertion);
+
static void insert_work(struct cpu_workqueue_struct *cwq,
struct work_struct *work, struct list_head *head)
{
+ trace_workqueue_insertion(cwq->thread, work);
+
set_wq_data(work, cwq);
/*
* Ensure that we get the right work->data if we see the
@@ -259,6 +264,8 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
}
EXPORT_SYMBOL_GPL(queue_delayed_work_on);

+DEFINE_TRACE(workqueue_execution);
+
static void run_workqueue(struct cpu_workqueue_struct *cwq)
{
spin_lock_irq(&cwq->lock);
@@ -284,7 +291,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
*/
struct lockdep_map lockdep_map = work->lockdep_map;
#endif
-
+ trace_workqueue_execution(cwq->thread, work);
cwq->current_work = work;
list_del_init(cwq->worklist.next);
spin_unlock_irq(&cwq->lock);
@@ -765,6 +772,8 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
return cwq;
}

+DEFINE_TRACE(workqueue_creation);
+
static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
@@ -787,6 +796,8 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
cwq->thread = p;

+ trace_workqueue_creation(cwq->thread, cpu);
+
return 0;
}

@@ -868,6 +879,8 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
}
EXPORT_SYMBOL_GPL(__create_workqueue_key);

+DEFINE_TRACE(workqueue_destruction);
+
static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
{
/*
@@ -891,6 +904,7 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
* checks list_empty(), and a "normal" queue_work() can't use
* a dead CPU.
*/
+ trace_workqueue_destruction(cwq->thread);
kthread_stop(cwq->thread);
cwq->thread = NULL;
}
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 5d90030..b5efa98 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -112,13 +112,13 @@ endif
# ---------------------------------------------------------------------------

# Default is built-in, unless we know otherwise
-modkern_cflags := $(CFLAGS_KERNEL)
+modkern_cflags = $(if $(part-of-module), $(CFLAGS_MODULE), $(CFLAGS_KERNEL))
quiet_modtag := $(empty) $(empty)

-$(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
-$(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
-$(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
-$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
+$(real-objs-m) : part-of-module := y
+$(real-objs-m:.o=.i) : part-of-module := y
+$(real-objs-m:.o=.s) : part-of-module := y
+$(real-objs-m:.o=.lst): part-of-module := y

$(real-objs-m) : quiet_modtag := [M]
$(real-objs-m:.o=.i) : quiet_modtag := [M]
@@ -215,7 +215,8 @@ endif
ifdef CONFIG_FTRACE_MCOUNT_RECORD
cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
"$(if $(CONFIG_64BIT),64,32)" \
- "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" "$(@)";
+ "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
+ "$(if $(part-of-module),1,0)" "$(@)";
endif

define rule_cc_o_c
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index fe83141..2ded5c8 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -100,14 +100,19 @@ $P =~ s@.*/@@g;

my $V = '0.1';

-if ($#ARGV < 6) {
- print "usage: $P arch objdump objcopy cc ld nm rm mv inputfile\n";
+if ($#ARGV < 7) {
+ print "usage: $P arch objdump objcopy cc ld nm rm mv is_module inputfile\n";
print "version: $V\n";
exit(1);
}

my ($arch, $bits, $objdump, $objcopy, $cc,
- $ld, $nm, $rm, $mv, $inputfile) = @ARGV;
+ $ld, $nm, $rm, $mv, $is_module, $inputfile) = @ARGV;
+
+# This file refers to mcount and shouldn't be ftraced, so lets' ignore it
+if ($inputfile eq "kernel/trace/ftrace.o") {
+ exit(0);
+}

# Acceptable sections to record.
my %text_sections = (
@@ -201,6 +206,13 @@ if ($arch eq "x86_64") {
$alignment = 2;
$section_type = '%progbits';

+} elsif ($arch eq "ia64") {
+ $mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
+ $type = "data8";
+
+ if ($is_module eq "0") {
+ $cc .= " -mconstant-gp";
+ }
} else {
die "Arch $arch is not supported with CONFIG_FTRACE_MCOUNT_RECORD";
}