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03f6316d32
Just like we do for userspace when reading the symtab, reducing the
number of entries we insert on the symbols rbtree.
Before:
[acme@emilia ~]$ rm -f perf_report.perf ; perf record -o perf_report.perf perf stat perf report > /dev/null
Performance counter stats for 'perf':
218.138382 task clock ticks (msecs)
4 context switches (events)
8 CPU migrations (events)
2136 pagefaults (events)
32746212 CPU cycles (events) (scaled from 67.04%)
11961102 instructions (events) (scaled from 66.19%)
49841 cache references (events) (scaled from 21.96%)
13777 cache misses (events) (scaled from 21.98%)
Wall-clock time elapsed: 218.702477 msecs
[acme@emilia ~]$ perf report -i perf_report.perf | head
11.06 perf [.] 0x00000000000057cb /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: dso__find_symbol
9.15 perf [.] 0x00000000000056a0 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: dso__insert_symbol
8.72 perf [k] 0xffffffff8101b1d2 intel_pmu_enable_all
8.51 perf [.] 0x0000000000006672 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: thread__symbol_incnew
3.83 perf [k] 0xffffffff811cfc5a vsnprintf
3.40 perf [.] 0x0000000000005e33 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: hex
3.40 perf [.] 0x0000000000005ec7 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: hex2long
3.19 perf [k] 0xffffffff811ce1c1 number
2.77 perf [.] 0x0000000000006869 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: threads__findnew
2.77 perf [.] 0x000000000000fde3 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: rb_insert_color
[acme@emilia ~]$
After:
acme@emilia ~]$ rm -f perf_report.perf ; perf record -o perf_report.perf perf stat perf report > /dev/null
Performance counter stats for 'perf':
190.228511 task clock ticks (msecs)
4 context switches (events)
7 CPU migrations (events)
1625 pagefaults (events)
29578745 CPU cycles (events) (scaled from 66.92%)
10516914 instructions (events) (scaled from 66.47%)
44015 cache references (events) (scaled from 22.04%)
8248 cache misses (events) (scaled from 22.07%)
Wall-clock time elapsed: 190.816096 msecs
[acme@emilia ~]$ perf report -i perf_report.perf | head
15.99 perf [.] 0x00000000000057a9 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: dso__find_symbol
10.87 perf [.] 0x000000000000674d /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: thread__symbol_incnew
8.74 perf [k] 0xffffffff8101b1d2 intel_pmu_enable_all
5.54 perf [.] 0x0000000000005e42 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: hex
4.48 perf [.] 0x0000000000005ebe /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: hex2long
4.48 perf [k] 0xffffffff811cfba0 vsnprintf
3.84 perf [.] 0x00000000000056b4 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: dso__insert_symbol
3.62 perf [.] 0x00000000000068d0 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: threads__findnew
3.20 perf [k] 0xffffffff811ce0b3 number
2.56 perf [.] 0x0000000000006d78 /home/acme/git/linux-2.6-tip/Documentation/perf_counter/perf: __cmd_report
[acme@emilia ~]$
[ Impact: optimization ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <20090526222155.GJ4424@ghostprotocols.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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||
|---|---|---|
| .. | ||
| Documentation | ||
| util | ||
| .gitignore | ||
| builtin-help.c | ||
| builtin-record.c | ||
| builtin-report.c | ||
| builtin-stat.c | ||
| builtin-top.c | ||
| builtin.h | ||
| command-list.txt | ||
| design.txt | ||
| Makefile | ||
| perf.c | ||
| perf.h | ||