From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Jin Yao <yao.jin@linux.intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Andi Kleen <ak@linux.intel.com>, Jiri Olsa <jolsa@kernel.org>,
Kan Liang <kan.liang@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 05/27] perf report: Fix a wrong offset issue when using /proc/kcore
Date: Wed, 10 Jan 2018 18:28:22 -0300 [thread overview]
Message-ID: <20180110212844.12441-6-acme@kernel.org> (raw)
In-Reply-To: <20180110212844.12441-1-acme@kernel.org>
From: Jin Yao <yao.jin@linux.intel.com>
When a valid vmlinux is not found, 'perf report' falls back to look at
/proc/kcore. In this case, it will report the impossible large offset.
For example:
# perf record -b -e cycles:k find /etc/ > /dev/null
# perf report --stdio --branch-history
22.77% _vm_normal_page+18446603336221188162
|
---page_remove_rmap +18446603336221188324
page_remove_rmap +18446603336221188487 (cycles:5)
unlock_page_memcg +18446603336221188096
page_remove_rmap +18446603336221188327 (cycles:1)
The issue is the value which is passed to parameter 'addr' in
__get_srcline() is the objdump address. It's not correct if we calculate
the offset by using 'addr - sym->start'.
This patch creates a new parameter 'ip' in __get_srcline(). It is not
converted to objdump address.
With this patch, the perf report output is:
22.77% _vm_normal_page+66
|
---page_remove_rmap +228
page_remove_rmap +391 (cycles:5)
unlock_page_memcg +0
page_remove_rmap +231 (cycles:1)
page_remove_rmap +236
Committer testing:
Make sure you get any valid vmlinux out of the way, using '-v' on the
'perf report' case and deleting it from places where perf searches them,
like your kernel build dir and the build-id cache, in ~/.debug/.
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1514564812-17344-1-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/annotate.c | 3 ++-
tools/perf/util/machine.c | 2 +-
tools/perf/util/map.c | 2 +-
tools/perf/util/sort.c | 16 ++++++++++------
tools/perf/util/srcline.c | 9 +++++----
tools/perf/util/srcline.h | 5 +++--
6 files changed, 22 insertions(+), 15 deletions(-)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 68e687d1bf99..28b233c3dcbe 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1960,7 +1960,8 @@ static void annotation__calc_lines(struct annotation *notes, struct map *map,
if (percent_max <= 0.5)
continue;
- al->path = get_srcline(map->dso, start + al->offset, NULL, false, true);
+ al->path = get_srcline(map->dso, start + al->offset, NULL,
+ false, true, start + al->offset);
insert_source_line(&tmp_root, al);
}
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 64d255f6a537..b05a67464c03 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1726,7 +1726,7 @@ static char *callchain_srcline(struct map *map, struct symbol *sym, u64 ip)
bool show_addr = callchain_param.key == CCKEY_ADDRESS;
srcline = get_srcline(map->dso, map__rip_2objdump(map, ip),
- sym, show_sym, show_addr);
+ sym, show_sym, show_addr, ip);
srcline__tree_insert(&map->dso->srclines, ip, srcline);
}
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 6d40efd74402..8fe57031e1a8 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -419,7 +419,7 @@ int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,
if (map && map->dso) {
srcline = get_srcline(map->dso,
map__rip_2objdump(map, addr), NULL,
- true, true);
+ true, true, addr);
if (srcline != SRCLINE_UNKNOWN)
ret = fprintf(fp, "%s%s", prefix, srcline);
free_srcline(srcline);
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index a00eacdf02ed..211e7f326b9f 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -336,7 +336,7 @@ char *hist_entry__get_srcline(struct hist_entry *he)
return SRCLINE_UNKNOWN;
return get_srcline(map->dso, map__rip_2objdump(map, he->ip),
- he->ms.sym, true, true);
+ he->ms.sym, true, true, he->ip);
}
static int64_t
@@ -380,7 +380,8 @@ sort__srcline_from_cmp(struct hist_entry *left, struct hist_entry *right)
map__rip_2objdump(map,
left->branch_info->from.al_addr),
left->branch_info->from.sym,
- true, true);
+ true, true,
+ left->branch_info->from.al_addr);
}
if (!right->branch_info->srcline_from) {
struct map *map = right->branch_info->from.map;
@@ -391,7 +392,8 @@ sort__srcline_from_cmp(struct hist_entry *left, struct hist_entry *right)
map__rip_2objdump(map,
right->branch_info->from.al_addr),
right->branch_info->from.sym,
- true, true);
+ true, true,
+ right->branch_info->from.al_addr);
}
return strcmp(right->branch_info->srcline_from, left->branch_info->srcline_from);
}
@@ -423,7 +425,8 @@ sort__srcline_to_cmp(struct hist_entry *left, struct hist_entry *right)
map__rip_2objdump(map,
left->branch_info->to.al_addr),
left->branch_info->from.sym,
- true, true);
+ true, true,
+ left->branch_info->to.al_addr);
}
if (!right->branch_info->srcline_to) {
struct map *map = right->branch_info->to.map;
@@ -434,7 +437,8 @@ sort__srcline_to_cmp(struct hist_entry *left, struct hist_entry *right)
map__rip_2objdump(map,
right->branch_info->to.al_addr),
right->branch_info->to.sym,
- true, true);
+ true, true,
+ right->branch_info->to.al_addr);
}
return strcmp(right->branch_info->srcline_to, left->branch_info->srcline_to);
}
@@ -465,7 +469,7 @@ static char *hist_entry__get_srcfile(struct hist_entry *e)
return no_srcfile;
sf = __get_srcline(map->dso, map__rip_2objdump(map, e->ip),
- e->ms.sym, false, true, true);
+ e->ms.sym, false, true, true, e->ip);
if (!strcmp(sf, SRCLINE_UNKNOWN))
return no_srcfile;
p = strchr(sf, ':');
diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index d19f05c56de6..3c21fd059b64 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -496,7 +496,8 @@ static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
#define A2L_FAIL_LIMIT 123
char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
- bool show_sym, bool show_addr, bool unwind_inlines)
+ bool show_sym, bool show_addr, bool unwind_inlines,
+ u64 ip)
{
char *file = NULL;
unsigned line = 0;
@@ -536,7 +537,7 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
if (sym) {
if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "",
- addr - sym->start) < 0)
+ ip - sym->start) < 0)
return SRCLINE_UNKNOWN;
} else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0)
return SRCLINE_UNKNOWN;
@@ -550,9 +551,9 @@ void free_srcline(char *srcline)
}
char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
- bool show_sym, bool show_addr)
+ bool show_sym, bool show_addr, u64 ip)
{
- return __get_srcline(dso, addr, sym, show_sym, show_addr, false);
+ return __get_srcline(dso, addr, sym, show_sym, show_addr, false, ip);
}
struct srcline_node {
diff --git a/tools/perf/util/srcline.h b/tools/perf/util/srcline.h
index 847b7086182c..b2bb5502fd62 100644
--- a/tools/perf/util/srcline.h
+++ b/tools/perf/util/srcline.h
@@ -11,9 +11,10 @@ struct symbol;
extern bool srcline_full_filename;
char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
- bool show_sym, bool show_addr);
+ bool show_sym, bool show_addr, u64 ip);
char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
- bool show_sym, bool show_addr, bool unwind_inlines);
+ bool show_sym, bool show_addr, bool unwind_inlines,
+ u64 ip);
void free_srcline(char *srcline);
/* insert the srcline into the DSO, which will take ownership */
--
2.14.3
next prev parent reply other threads:[~2018-01-10 21:28 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-10 21:28 [GIT PULL 00/27] perf/core improvements and fixes Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 01/27] perf test bpf: Improve message about expected samples Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 02/27] perf test bpf: Use designated struct field initializers Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 03/27] perf test bpf: Hook on epoll_pwait() Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 04/27] perf tools: Fix compile error with libunwind x86 Arnaldo Carvalho de Melo
2018-01-10 21:28 ` Arnaldo Carvalho de Melo [this message]
2018-01-10 21:28 ` [PATCH 06/27] perf report: Fix a no annotate browser displayed issue Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 07/27] perf header: Add infrastructure to record first and last sample time Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 08/27] perf record: Record the first and last sample time in the header Arnaldo Carvalho de Melo
2018-01-11 13:29 ` Paul Clarke
2018-01-11 14:46 ` Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 09/27] perf tools: Create function to parse time percent Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 10/27] perf tools: Create function to perform multiple time range checking Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 11/27] perf report: Support time percent and multiple time ranges Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 12/27] perf script: " Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 13/27] perf tools: Enable LIBBABELTRACE by default Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 14/27] perf tools: Display perf_event_attr::namespaces debug info Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 15/27] perf: Allocate context task_ctx_data for child event Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 16/27] perf: Add sample_id to PERF_RECORD_ITRACE_START event comment Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 17/27] perf: Make perf_callchain function static Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 18/27] perf: Return empty callchain instead of NULL Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 19/27] perf: Update PERF_RECORD_MISC_* comment for perf_event_header::misc bit 13 Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 20/27] perf script: Add support to display sample misc field Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 21/27] perf script: Add support to display lost events Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 22/27] perf tools: Make the tool's warning messages optional Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 23/27] perf report: Add --stats option to display quick data statistics Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 24/27] perf trace: Beautify 'gettid' syscall result Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 25/27] perf report: Add --tasks option to display monitored tasks Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 26/27] perf report: Introduce --mmaps Arnaldo Carvalho de Melo
2018-01-10 21:28 ` [PATCH 27/27] tools headers: Synchronize kernel <-> tooling headers Arnaldo Carvalho de Melo
2018-01-11 5:54 ` [GIT PULL 00/27] perf/core improvements and fixes Ingo Molnar
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