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perf diff: Introduce tool to show performance difference
I guess it is enough to show some examples: [root@doppio linux-2.6-tip]# rm -f perf.data* [root@doppio linux-2.6-tip]# ls -la perf.data* ls: cannot access perf.data*: No such file or directory [root@doppio linux-2.6-tip]# perf record -f find / > /dev/null [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.062 MB perf.data (~2699 samples) ] [root@doppio linux-2.6-tip]# ls -la perf.data* -rw------- 1 root root 74440 2009-12-14 20:03 perf.data [root@doppio linux-2.6-tip]# perf record -f find / > /dev/null [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.062 MB perf.data (~2692 samples) ] [root@doppio linux-2.6-tip]# ls -la perf.data* -rw------- 1 root root 74280 2009-12-14 20:03 perf.data -rw------- 1 root root 74440 2009-12-14 20:03 perf.data.old [root@doppio linux-2.6-tip]# perf diff | head -5 1 -34994580 /lib64/libc-2.10.1.so _IO_vfprintf_internal 2 -15307806 [kernel.kallsyms] __kmalloc 3 +1 +3665941 /lib64/libc-2.10.1.so __GI_memmove 4 +4 +23508995 /lib64/libc-2.10.1.so _int_malloc 5 +7 +38538813 [kernel.kallsyms] __d_lookup [root@doppio linux-2.6-tip]# perf diff -p | head -5 1 +1.00% /lib64/libc-2.10.1.so _IO_vfprintf_internal 2 [kernel.kallsyms] __kmalloc 3 +1 /lib64/libc-2.10.1.so __GI_memmove 4 +4 /lib64/libc-2.10.1.so _int_malloc 5 +7 -1.00% [kernel.kallsyms] __d_lookup [root@doppio linux-2.6-tip]# perf diff -v | head -5 1 361449551 326454971 -34994580 /lib64/libc-2.10.1.so _IO_vfprintf_internal 2 151009241 135701435 -15307806 [kernel.kallsyms] __kmalloc 3 +1 101805328 105471269 +3665941 /lib64/libc-2.10.1.so __GI_memmove 4 +4 78041440 101550435 +23508995 /lib64/libc-2.10.1.so _int_malloc 5 +7 59536172 98074985 +38538813 [kernel.kallsyms] __d_lookup [root@doppio linux-2.6-tip]# perf diff -vp | head -5 1 9.00% 8.00% +1.00% /lib64/libc-2.10.1.so _IO_vfprintf_internal 2 3.00% 3.00% [kernel.kallsyms] __kmalloc 3 +1 2.00% 2.00% /lib64/libc-2.10.1.so __GI_memmove 4 +4 2.00% 2.00% /lib64/libc-2.10.1.so _int_malloc 5 +7 1.00% 2.00% -1.00% [kernel.kallsyms] __d_lookup [root@doppio linux-2.6-tip]# This should be enough for diffs where the system is non volatile, i.e. when one doesn't updates binaries. For volatile environments, stay tuned for the next perf tool feature: a buildid cache populated by 'perf record', managed by 'perf buildid-cache' a-la ccache, and used by all the report tools. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> LKML-Reference: <1260828571-3613-3-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Arnaldo Carvalho de Melo
Ingo Molnar
parent
b38d34645c
commit
86a9eee047
31
tools/perf/Documentation/perf-diff.txt
Normal file
31
tools/perf/Documentation/perf-diff.txt
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@ -0,0 +1,31 @@
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perf-diff(1)
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==============
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NAME
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----
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perf-diff - Read perf.data (created by perf record) and display the profile
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SYNOPSIS
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--------
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[verse]
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'perf diff' [oldfile] [newfile]
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DESCRIPTION
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-----------
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This command displays the performance difference among two perf.data files
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captured via perf record.
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If no parameters are passed it will assume perf.data.old and perf.data.
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OPTIONS
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-------
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-p::
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--percentage::
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Show percentages instead of raw counters
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-v::
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--verbose::
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Be verbose, for instance, show the raw counters in addition to the
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diff.
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SEE ALSO
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--------
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linkperf:perf-record[1]
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@ -427,6 +427,7 @@ BUILTIN_OBJS += bench/sched-messaging.o
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BUILTIN_OBJS += bench/sched-pipe.o
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BUILTIN_OBJS += bench/mem-memcpy.o
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BUILTIN_OBJS += builtin-diff.o
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BUILTIN_OBJS += builtin-help.o
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BUILTIN_OBJS += builtin-sched.o
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BUILTIN_OBJS += builtin-buildid-list.o
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288
tools/perf/builtin-diff.c
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288
tools/perf/builtin-diff.c
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@ -0,0 +1,288 @@
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/*
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* builtin-diff.c
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*
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* Builtin diff command: Analyze two perf.data input files, look up and read
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* DSOs and symbol information, sort them and produce a diff.
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*/
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#include "builtin.h"
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#include "util/debug.h"
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#include "util/event.h"
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#include "util/hist.h"
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#include "util/session.h"
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#include "util/sort.h"
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#include "util/symbol.h"
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#include "util/util.h"
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#include <stdlib.h>
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static char const *input_old = "perf.data.old",
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*input_new = "perf.data";
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static int force;
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static bool show_percent;
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struct symbol_conf symbol_conf;
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static int perf_session__add_hist_entry(struct perf_session *self,
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struct addr_location *al, u64 count)
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{
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bool hit;
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struct hist_entry *he = __perf_session__add_hist_entry(self, al, NULL,
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count, &hit);
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if (he == NULL)
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return -ENOMEM;
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if (hit)
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he->count += count;
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return 0;
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}
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static int diff__process_sample_event(event_t *event, struct perf_session *session)
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{
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struct addr_location al;
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struct sample_data data = { .period = 1, };
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dump_printf("(IP, %d): %d: %p\n", event->header.misc,
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event->ip.pid, (void *)(long)event->ip.ip);
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if (event__preprocess_sample(event, session, &al, NULL) < 0) {
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pr_warning("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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event__parse_sample(event, session->sample_type, &data);
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if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
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pr_warning("problem incrementing symbol count, skipping event\n");
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return -1;
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}
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session->events_stats.total += data.period;
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return 0;
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}
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static struct perf_event_ops event_ops = {
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.process_sample_event = diff__process_sample_event,
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.process_mmap_event = event__process_mmap,
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.process_comm_event = event__process_comm,
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.process_exit_event = event__process_task,
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.process_fork_event = event__process_task,
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.process_lost_event = event__process_lost,
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};
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static void perf_session__insert_hist_entry_by_name(struct rb_root *root,
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struct hist_entry *he)
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{
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struct rb_node **p = &root->rb_node;
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struct rb_node *parent = NULL;
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struct hist_entry *iter;
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while (*p != NULL) {
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int cmp;
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parent = *p;
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iter = rb_entry(parent, struct hist_entry, rb_node);
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cmp = strcmp(he->map->dso->name, iter->map->dso->name);
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if (cmp > 0)
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p = &(*p)->rb_left;
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else if (cmp < 0)
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p = &(*p)->rb_right;
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else {
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cmp = strcmp(he->sym->name, iter->sym->name);
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if (cmp > 0)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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}
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rb_link_node(&he->rb_node, parent, p);
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rb_insert_color(&he->rb_node, root);
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}
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static void perf_session__resort_by_name(struct perf_session *self)
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{
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unsigned long position = 1;
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struct rb_root tmp = RB_ROOT;
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struct rb_node *next = rb_first(&self->hists);
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while (next != NULL) {
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struct hist_entry *n = rb_entry(next, struct hist_entry, rb_node);
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next = rb_next(&n->rb_node);
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rb_erase(&n->rb_node, &self->hists);
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n->position = position++;
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perf_session__insert_hist_entry_by_name(&tmp, n);
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}
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self->hists = tmp;
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}
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static struct hist_entry *
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perf_session__find_hist_entry_by_name(struct perf_session *self,
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struct hist_entry *he)
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{
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struct rb_node *n = self->hists.rb_node;
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while (n) {
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struct hist_entry *iter = rb_entry(n, struct hist_entry, rb_node);
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int cmp = strcmp(he->map->dso->name, iter->map->dso->name);
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if (cmp > 0)
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n = n->rb_left;
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else if (cmp < 0)
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n = n->rb_right;
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else {
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cmp = strcmp(he->sym->name, iter->sym->name);
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if (cmp > 0)
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n = n->rb_left;
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else if (cmp < 0)
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n = n->rb_right;
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else
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return iter;
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}
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}
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return NULL;
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}
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static void perf_session__match_hists(struct perf_session *old_session,
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struct perf_session *new_session)
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{
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struct rb_node *nd;
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perf_session__resort_by_name(old_session);
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for (nd = rb_first(&new_session->hists); nd; nd = rb_next(nd)) {
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struct hist_entry *pos = rb_entry(nd, struct hist_entry, rb_node);
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pos->pair = perf_session__find_hist_entry_by_name(old_session, pos);
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}
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}
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static size_t hist_entry__fprintf_matched(struct hist_entry *self,
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unsigned long pos,
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struct perf_session *session,
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struct perf_session *pair_session,
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FILE *fp)
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{
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u64 old_count = 0;
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char displacement[16];
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size_t printed;
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if (self->pair != NULL) {
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long pdiff = (long)self->pair->position - (long)pos;
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old_count = self->pair->count;
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if (pdiff == 0)
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goto blank;
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snprintf(displacement, sizeof(displacement), "%+4ld", pdiff);
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} else {
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blank: memset(displacement, ' ', sizeof(displacement));
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}
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printed = fprintf(fp, "%4lu %5.5s ", pos, displacement);
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if (show_percent) {
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double old_percent = (old_count * 100) / pair_session->events_stats.total,
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new_percent = (self->count * 100) / session->events_stats.total;
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double diff = old_percent - new_percent;
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if (verbose)
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printed += fprintf(fp, " %3.2f%% %3.2f%%", old_percent, new_percent);
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if ((u64)diff != 0)
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printed += fprintf(fp, " %+4.2F%%", diff);
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else
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printed += fprintf(fp, " ");
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} else {
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if (verbose)
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printed += fprintf(fp, " %9Lu %9Lu", old_count, self->count);
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printed += fprintf(fp, " %+9Ld", (s64)self->count - (s64)old_count);
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}
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return printed + fprintf(fp, " %25.25s %s\n",
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self->map->dso->name, self->sym->name);
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}
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static size_t perf_session__fprintf_matched_hists(struct perf_session *self,
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struct perf_session *pair,
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FILE *fp)
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{
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struct rb_node *nd;
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size_t printed = 0;
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unsigned long pos = 1;
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for (nd = rb_first(&self->hists); nd; nd = rb_next(nd)) {
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struct hist_entry *he = rb_entry(nd, struct hist_entry, rb_node);
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printed += hist_entry__fprintf_matched(he, pos++, self, pair, fp);
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}
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return printed;
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}
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static int __cmd_diff(void)
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{
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int ret, i;
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struct perf_session *session[2];
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session[0] = perf_session__new(input_old, O_RDONLY, force, &symbol_conf);
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session[1] = perf_session__new(input_new, O_RDONLY, force, &symbol_conf);
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if (session[0] == NULL || session[1] == NULL)
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return -ENOMEM;
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for (i = 0; i < 2; ++i) {
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ret = perf_session__process_events(session[i], &event_ops);
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if (ret)
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goto out_delete;
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perf_session__output_resort(session[i], session[i]->events_stats.total);
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}
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perf_session__match_hists(session[0], session[1]);
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perf_session__fprintf_matched_hists(session[1], session[0], stdout);
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out_delete:
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for (i = 0; i < 2; ++i)
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perf_session__delete(session[i]);
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return ret;
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}
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static const char *const diff_usage[] = {
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"perf diff [<options>] [old_file] [new_file]",
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};
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static const struct option options[] = {
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show symbol address, etc)"),
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OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
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"dump raw trace in ASCII"),
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OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
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OPT_BOOLEAN('m', "modules", &symbol_conf.use_modules,
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"load module symbols - WARNING: use only with -k and LIVE kernel"),
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OPT_BOOLEAN('p', "percentages", &show_percent,
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"Don't shorten the pathnames taking into account the cwd"),
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OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths,
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"Don't shorten the pathnames taking into account the cwd"),
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OPT_END()
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};
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int cmd_diff(int argc, const char **argv, const char *prefix __used)
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{
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if (symbol__init(&symbol_conf) < 0)
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return -1;
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setup_sorting(diff_usage, options);
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argc = parse_options(argc, argv, options, diff_usage, 0);
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if (argc) {
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if (argc > 2)
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usage_with_options(diff_usage, options);
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if (argc == 2) {
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input_old = argv[0];
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input_new = argv[1];
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} else
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input_new = argv[0];
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}
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setup_pager();
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return __cmd_diff();
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}
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@ -17,6 +17,7 @@ extern int check_pager_config(const char *cmd);
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extern int cmd_annotate(int argc, const char **argv, const char *prefix);
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extern int cmd_bench(int argc, const char **argv, const char *prefix);
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extern int cmd_buildid_list(int argc, const char **argv, const char *prefix);
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extern int cmd_diff(int argc, const char **argv, const char *prefix);
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extern int cmd_help(int argc, const char **argv, const char *prefix);
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extern int cmd_sched(int argc, const char **argv, const char *prefix);
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extern int cmd_list(int argc, const char **argv, const char *prefix);
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@ -5,6 +5,7 @@
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perf-annotate mainporcelain common
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perf-bench mainporcelain common
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perf-buildid-list mainporcelain common
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perf-diff mainporcelain common
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perf-list mainporcelain common
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perf-sched mainporcelain common
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perf-record mainporcelain common
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@ -286,6 +286,7 @@ static void handle_internal_command(int argc, const char **argv)
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const char *cmd = argv[0];
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static struct cmd_struct commands[] = {
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{ "buildid-list", cmd_buildid_list, 0 },
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{ "diff", cmd_diff, 0 },
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{ "help", cmd_help, 0 },
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{ "list", cmd_list, 0 },
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{ "record", cmd_record, 0 },
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@ -49,9 +49,13 @@ struct hist_entry {
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struct symbol *sym;
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u64 ip;
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char level;
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struct symbol *parent;
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struct symbol *parent;
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struct callchain_node callchain;
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struct rb_root sorted_chain;
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union {
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unsigned long position;
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struct hist_entry *pair;
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struct rb_root sorted_chain;
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};
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};
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enum sort_type {
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