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bfaef4b46b
Previously there were blind spots because we were not looking at symbols
that didn't ocurred in the latest run:
# perf record usleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.018 MB perf.data (~801 samples) ]
# perf record usleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.018 MB perf.data (~801 samples) ]
Before:
# perf diff
# Event 'cycles'
#
# Baseline Delta Shared Object Symbol
# ........ ....... ................. .............................
#
+10.38% [kernel.kallsyms] [k] get_empty_filp
+9.51% [kernel.kallsyms] [k] update_sd_lb_stats
+9.41% libpopt.so.0.0.0 [.] _init
+9.29% [kernel.kallsyms] [k] vma_interval_tree_insert
9.05% +0.12% [kernel.kallsyms] [k] do_sys_open
+9.14% [kernel.kallsyms] [k] kfree
+8.98% [kernel.kallsyms] [k] free_pages_and_swap_cache
+8.78% [kernel.kallsyms] [k] unmap_page_range
9.36% -0.90% [kernel.kallsyms] [k] zap_pte_range
7.60% +0.09% [kernel.kallsyms] [k] find_next_bit
+4.37% [kernel.kallsyms] [k] place_entity
+3.38% [kernel.kallsyms] [k] __do_page_fault
+0.80% [kernel.kallsyms] [k] native_apic_mem_write
0.21% +0.43% [kernel.kallsyms] [k] native_write_msr_safe
#
So 9.05 + 9.36 + 7.60 + 0.21 != 100%
Now using the recently introduced hists__link we can see the whole
picture:
# perf diff
# Event 'cycles'
#
# Baseline Delta Shared Object Symbol
# ........ ....... ................. .............................
#
8.44% -8.44% [kernel.kallsyms] [k] _raw_spin_lock
9.05% -9.05% [kernel.kallsyms] [k] sha_transform
10.55% -10.55% [kernel.kallsyms] [k] __d_lookup_rcu
+10.38% [kernel.kallsyms] [k] get_empty_filp
17.70% -17.70% [kernel.kallsyms] [k] kmem_cache_free
+9.51% [kernel.kallsyms] [k] update_sd_lb_stats
+9.41% libpopt.so.0.0.0 [.] _init
+9.29% [kernel.kallsyms] [k] vma_interval_tree_insert
9.05% +0.12% [kernel.kallsyms] [k] do_sys_open
+9.14% [kernel.kallsyms] [k] kfree
+8.98% [kernel.kallsyms] [k] free_pages_and_swap_cache
+8.78% [kernel.kallsyms] [k] unmap_page_range
9.36% -0.90% [kernel.kallsyms] [k] zap_pte_range
7.60% +0.09% [kernel.kallsyms] [k] find_next_bit
+4.37% [kernel.kallsyms] [k] place_entity
+3.38% [kernel.kallsyms] [k] __do_page_fault
4.01% -4.01% [kernel.kallsyms] [k] handle_pte_fault
9.27% -9.27% [kernel.kallsyms] [k] find_get_page
0.78% -0.78% [kernel.kallsyms] [k] rcu_irq_enter
0.57% -0.57% [kernel.kallsyms] [k] finish_task_switch
4.25% -4.25% [kernel.kallsyms] [k] run_timer_softirq
+0.80% [kernel.kallsyms] [k] native_apic_mem_write
0.21% +0.43% [kernel.kallsyms] [k] native_write_msr_safe
9.16% -9.16% ld-2.12.so [.] close
#
Now:
8.44 + 9.05 + 10.55 + 17.70 + 9.05 + 9.36 +
7.60 + 4.01 + 9.27 + 0.78 + 0.57 + 4.25 + 0.21 + 9.16 == 100%
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-jeq55qdgby1745bs8r9sscdh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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|---|---|---|
| .. | ||
| arch | ||
| bench | ||
| config | ||
| Documentation | ||
| python | ||
| scripts | ||
| tests | ||
| ui | ||
| util | ||
| .gitignore | ||
| bash_completion | ||
| builtin-annotate.c | ||
| builtin-bench.c | ||
| builtin-buildid-cache.c | ||
| builtin-buildid-list.c | ||
| builtin-diff.c | ||
| builtin-evlist.c | ||
| builtin-help.c | ||
| builtin-inject.c | ||
| builtin-kmem.c | ||
| builtin-kvm.c | ||
| builtin-list.c | ||
| builtin-lock.c | ||
| builtin-probe.c | ||
| builtin-record.c | ||
| builtin-report.c | ||
| builtin-sched.c | ||
| builtin-script.c | ||
| builtin-stat.c | ||
| builtin-timechart.c | ||
| builtin-top.c | ||
| builtin-trace.c | ||
| builtin.h | ||
| command-list.txt | ||
| CREDITS | ||
| design.txt | ||
| Makefile | ||
| MANIFEST | ||
| perf-archive.sh | ||
| perf.c | ||
| perf.h | ||