From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751916Ab2GVMPl (ORCPT ); Sun, 22 Jul 2012 08:15:41 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20401 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751451Ab2GVMPa (ORCPT ); Sun, 22 Jul 2012 08:15:30 -0400 From: Jiri Olsa To: acme@redhat.com, a.p.zijlstra@chello.nl, mingo@elte.hu, paulus@samba.org, cjashfor@linux.vnet.ibm.com, fweisbec@gmail.com Cc: eranian@google.com, gorcunov@openvz.org, tzanussi@gmail.com, mhiramat@redhat.com, robert.richter@amd.com, fche@redhat.com, linux-kernel@vger.kernel.org, masami.hiramatsu.pt@hitachi.com, drepper@gmail.com, asharma@fb.com, benjamin.redelings@nescent.org, Jiri Olsa Subject: [PATCH 07/17] perf: Add attribute to filter out callchains Date: Sun, 22 Jul 2012 14:14:30 +0200 Message-Id: <1342959280-5361-8-git-send-email-jolsa@redhat.com> In-Reply-To: <1342959280-5361-1-git-send-email-jolsa@redhat.com> References: <1342959280-5361-1-git-send-email-jolsa@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Frederic Weisbecker Introducing following bits to the the perf_event_attr struct: - exclude_callchain_kernel to filter out kernel callchain from the sample dump - exclude_callchain_user to filter out user callchain from the sample dump We need to be able to disable standard user callchain dump when we use the dwarf cfi callchain mode, because frame pointer based user callchains are useless in this mode. Implementing also exclude_callchain_kernel to have complete set of options. Signed-off-by: Frederic Weisbecker [ Added kernel callchains filtering ] Signed-off-by: Jiri Olsa --- include/linux/perf_event.h | 5 ++++- kernel/events/callchain.c | 25 +++++++++++++++---------- kernel/events/core.c | 5 ++++- kernel/events/internal.h | 3 ++- 4 files changed, 25 insertions(+), 13 deletions(-) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index b4663b3..91c2de2 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -259,7 +259,10 @@ struct perf_event_attr { exclude_host : 1, /* don't count in host */ exclude_guest : 1, /* don't count in guest */ - __reserved_1 : 43; + exclude_callchain_kernel : 1, /* exclude kernel callchains */ + exclude_callchain_user : 1, /* exclude user callchains */ + + __reserved_1 : 41; union { __u32 wakeup_events; /* wakeup every n events */ diff --git a/kernel/events/callchain.c b/kernel/events/callchain.c index 6581a04..905ffb2 100644 --- a/kernel/events/callchain.c +++ b/kernel/events/callchain.c @@ -153,12 +153,12 @@ put_callchain_entry(int rctx) put_recursion_context(__get_cpu_var(callchain_recursion), rctx); } -struct perf_callchain_entry *perf_callchain(struct pt_regs *regs) +struct perf_callchain_entry *perf_callchain(struct pt_regs *regs, + int kernel, int user) { int rctx; struct perf_callchain_entry *entry; - entry = get_callchain_entry(&rctx); if (rctx == -1) return NULL; @@ -168,18 +168,23 @@ struct perf_callchain_entry *perf_callchain(struct pt_regs *regs) entry->nr = 0; - if (!user_mode(regs)) { + if (kernel && !user_mode(regs)) { perf_callchain_store(entry, PERF_CONTEXT_KERNEL); perf_callchain_kernel(entry, regs); - if (current->mm) - regs = task_pt_regs(current); - else - regs = NULL; } - if (regs) { - perf_callchain_store(entry, PERF_CONTEXT_USER); - perf_callchain_user(entry, regs); + if (user) { + if (!user_mode(regs)) { + if (current->mm) + regs = task_pt_regs(current); + else + regs = NULL; + } + + if (regs) { + perf_callchain_store(entry, PERF_CONTEXT_USER); + perf_callchain_user(entry, regs); + } } exit_put: diff --git a/kernel/events/core.c b/kernel/events/core.c index 8a9cf80..78f405e 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4126,8 +4126,11 @@ void perf_prepare_sample(struct perf_event_header *header, if (sample_type & PERF_SAMPLE_CALLCHAIN) { int size = 1; + int kernel = !event->attr.exclude_callchain_kernel; + int user = !event->attr.exclude_callchain_user; - data->callchain = perf_callchain(regs); + if (kernel || user) + data->callchain = perf_callchain(regs, kernel, user); if (data->callchain) size += data->callchain->nr; diff --git a/kernel/events/internal.h b/kernel/events/internal.h index be1ef29..abcc03d 100644 --- a/kernel/events/internal.h +++ b/kernel/events/internal.h @@ -125,7 +125,8 @@ DEFINE_OUTPUT_COPY(__output_skip, MEMCPY_SKIP) DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user) /* Callchain handling */ -extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs); +extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs, + int kernel, int user); extern int get_callchain_buffers(void); extern void put_callchain_buffers(void); -- 1.7.7.6