From c20ab37ef30f4a874cf27e84c12c73e584e6f5cc Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Thu, 2 Jul 2009 20:14:33 +0200 Subject: [PATCH] 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 Cc: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Anton Blanchard Cc: Arnaldo Carvalho de Melo LKML-Reference: <1246558475-10624-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar --- tools/perf/builtin-report.c | 45 ++++++++++++++++++++++++++++++++++----------- tools/perf/util/callchain.c | 19 +++++++++++-------- tools/perf/util/callchain.h | 6 ++++-- 3 files changed, 49 insertions(+), 21 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...]", diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index a9873aa..c9900fe 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -57,18 +57,19 @@ rb_insert_callchain(struct rb_root *root, struct callchain_node *chain, * Once we get every callchains from the stream, we can now * sort them by hit */ -void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node) +void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node, + u64 min_hit) { struct callchain_node *child; chain_for_each_child(child, node) - sort_chain_flat(rb_root, child); + sort_chain_flat(rb_root, child, min_hit); - if (node->hit) + if (node->hit && node->hit >= min_hit) rb_insert_callchain(rb_root, node, FLAT); } -static void __sort_chain_graph(struct callchain_node *node) +static void __sort_chain_graph(struct callchain_node *node, u64 min_hit) { struct callchain_node *child; @@ -76,16 +77,18 @@ static void __sort_chain_graph(struct callchain_node *node) node->cumul_hit = node->hit; chain_for_each_child(child, node) { - __sort_chain_graph(child); - rb_insert_callchain(&node->rb_root, child, GRAPH); + __sort_chain_graph(child, min_hit); + if (child->cumul_hit >= min_hit) + rb_insert_callchain(&node->rb_root, child, GRAPH); node->cumul_hit += child->cumul_hit; } } void -sort_chain_graph(struct rb_root *rb_root, struct callchain_node *chain_root) +sort_chain_graph(struct rb_root *rb_root, struct callchain_node *chain_root, + u64 min_hit) { - __sort_chain_graph(chain_root); + __sort_chain_graph(chain_root, min_hit); rb_root->rb_node = chain_root->rb_root.rb_node; } diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h index dfa5600..f3e4776 100644 --- a/tools/perf/util/callchain.h +++ b/tools/perf/util/callchain.h @@ -38,6 +38,8 @@ static inline void callchain_init(struct callchain_node *node) void append_chain(struct callchain_node *root, struct ip_callchain *chain, struct symbol **syms); -void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node); -void sort_chain_graph(struct rb_root *rb_root, struct callchain_node *node); +void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node, + u64 min_hit); +void sort_chain_graph(struct rb_root *rb_root, struct callchain_node *node, + u64 min_hit); #endif -- 2.7.4