diff options
author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-07-02 18:14:33 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-07-02 19:38:37 (GMT) |
commit | c20ab37ef30f4a874cf27e84c12c73e584e6f5cc (patch) | |
tree | 47f4d893d09727e387ac6742cc20156302e9c3fa /tools/perf/builtin-report.c | |
parent | 4eb3e4788b8a5e220a0aeb590f88c28850726ebe (diff) | |
download | linux-fsl-qoriq-c20ab37ef30f4a874cf27e84c12c73e584e6f5cc.tar.xz |
perf_counter tools: Set the minimum percent for callchains to be displayed
Callchains output may become a burden on a trace because even
rarely hit site are exposed. This can be too much information.
Let the user set a threshold as a minimum percent of hits using
the new pattern for the -c option:
-c mode,min_percent
Example:
$ perf report -s sym -c flat,4
8.25% [k] copy_user_generic_string
4.19%
copy_user_generic_string
generic_file_aio_read
do_sync_read
vfs_read
sys_pread64
system_call_fastpath
pread64
5.39% [k] search_by_key
4.63% 0x00000000009e0a
2.36% [k] memcpy_c
[...]
$ perf report -s sym -c graph,2
8.25% [k] copy_user_generic_string
|
|--4.31%-- generic_file_aio_read
| do_sync_read
| vfs_read
| |
| --4.19%-- sys_pread64
| system_call_fastpath
| pread64
|
--3.24%-- generic_file_buffered_write
__generic_file_aio_write_nolock
generic_file_aio_write
do_sync_write
reiserfs_file_write
vfs_write
|
--3.14%-- sys_pwrite64
system_call_fastpath
__pwrite64
5.39% [k] search_by_key
|
--2.23%-- reiserfs_update_sd_size
4.63% 0x00000000009e0a
2.36% [k] memcpy_c
[...]
You can also omit it and it will default to 0.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246558475-10624-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-report.c')
-rw-r--r-- | tools/perf/builtin-report.c | 45 |
1 files changed, 34 insertions, 11 deletions
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index 0ca4638..e8c9817 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -60,6 +60,7 @@ static regex_t parent_regex; static int exclude_other = 1; static int callchain; static enum chain_mode callchain_mode; +static double callchain_min_percent = 0.0; static u64 sample_type; @@ -1224,7 +1225,7 @@ static void collapse__resort(void) static struct rb_root output_hists; -static void output__insert_entry(struct hist_entry *he) +static void output__insert_entry(struct hist_entry *he, u64 min_callchain_hits) { struct rb_node **p = &output_hists.rb_node; struct rb_node *parent = NULL; @@ -1232,9 +1233,11 @@ static void output__insert_entry(struct hist_entry *he) if (callchain) { if (callchain_mode == FLAT) - sort_chain_flat(&he->sorted_chain, &he->callchain); + sort_chain_flat(&he->sorted_chain, &he->callchain, + min_callchain_hits); else if (callchain_mode == GRAPH) - sort_chain_graph(&he->sorted_chain, &he->callchain); + sort_chain_graph(&he->sorted_chain, &he->callchain, + min_callchain_hits); } while (*p != NULL) { @@ -1251,11 +1254,14 @@ static void output__insert_entry(struct hist_entry *he) rb_insert_color(&he->rb_node, &output_hists); } -static void output__resort(void) +static void output__resort(u64 total_samples) { struct rb_node *next; struct hist_entry *n; struct rb_root *tree = &hist; + u64 min_callchain_hits; + + min_callchain_hits = total_samples * (callchain_min_percent / 100); if (sort__need_collapse) tree = &collapse_hists; @@ -1267,7 +1273,7 @@ static void output__resort(void) next = rb_next(&n->rb_node); rb_erase(&n->rb_node, tree); - output__insert_entry(n); + output__insert_entry(n, min_callchain_hits); } } @@ -1801,7 +1807,7 @@ done: dsos__fprintf(stdout); collapse__resort(); - output__resort(); + output__resort(total); output__fprintf(stdout, total); return rc; @@ -1811,19 +1817,36 @@ static int parse_callchain_opt(const struct option *opt __used, const char *arg, int unset __used) { + char *tok; + char *endptr; + callchain = 1; if (!arg) return 0; - if (!strncmp(arg, "graph", strlen(arg))) + tok = strtok((char *)arg, ","); + if (!tok) + return -1; + + /* get the output mode */ + if (!strncmp(tok, "graph", strlen(arg))) callchain_mode = GRAPH; - else if (!strncmp(arg, "flat", strlen(arg))) + else if (!strncmp(tok, "flat", strlen(arg))) callchain_mode = FLAT; else return -1; + /* get the min percentage */ + tok = strtok(NULL, ","); + if (!tok) + return 0; + + callchain_min_percent = strtod(tok, &endptr); + if (tok == endptr) + return -1; + return 0; } @@ -1850,9 +1873,9 @@ static const struct option options[] = { "regex filter to identify parent, see: '--sort parent'"), OPT_BOOLEAN('x', "exclude-other", &exclude_other, "Only display entries with parent-match"), - OPT_CALLBACK_DEFAULT('c', "callchain", NULL, "output_type", - "Display callchains with output_type: flat, graph. " - "Default to flat", &parse_callchain_opt, "flat"), + OPT_CALLBACK_DEFAULT('c', "callchain", NULL, "output_type,min_percent", + "Display callchains using output_type and min percent threshold. " + "Default: flat,0", &parse_callchain_opt, "flat,100"), OPT_STRING('d', "dsos", &dso_list_str, "dso[,dso...]", "only consider symbols in these dsos"), OPT_STRING('C', "comms", &comm_list_str, "comm[,comm...]", |