From: Jin Yao Date: Fri, 29 Dec 2017 16:26:52 +0000 (+0800) Subject: perf report: Fix a wrong offset issue when using /proc/kcore X-Git-Tag: v5.15~9565^2~3^2~22 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=935f5a9d4500020879858c9224c98dfabf16101d;p=platform%2Fkernel%2Flinux-starfive.git perf report: Fix a wrong offset issue when using /proc/kcore 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 Signed-off-by: Jin Yao Tested-by: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Andi Kleen Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1514564812-17344-1-git-send-email-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c index 68e687d..28b233c 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 64d255f..b05a674 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 6d40efd..8fe5703 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 a00eacd..211e7f3 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 d19f05c..3c21fd0 100644 --- a/tools/perf/util/srcline.c +++ b/tools/perf/util/srcline.c @@ -496,7 +496,8 @@ out: #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 @@ out: 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 847b708..b2bb5502 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 */