Thanks David. This indeed gave more samples. Do you know why the
symbol [k] 0xffffffff81043fea occured so often? As shown in the
pasted result, both "swapper" and "perf" had this symbol. And if I
"perf record dd if=/dev/zero of=/dev/null" or "perf record ping", they
all showed this symbol. I pasted these results in the end of this
email.
I guess my real concern is the symbols cannot be mapped into
meaningful function names. These symbols cannot be found in either
/proc/kallsyms nor the vmlinux I built from the kernel source tree.
Any idea? Thanks.
result of sudo perf record -a -- sleep 1
# Samples: 104 of event 'cycles'
# Event count (approx.): 61197061
#
# Overhead Command Shared Object Symbol
# ........ ............... .......................... ......
#
47.49% swapper [kernel.kallsyms] [k] 0xffffffff81043fea
11.78% chromium-browse [kernel.kallsyms] [k] 0xffffffff81095950
11.46% chromium-browse chromium-browser [.] 0x000000000160d0a6
4.07% chromium-browse perf-5594.map [.] 0x00000bb86b1cb70a
4.07% perf [kernel.kallsyms] [k] 0xffffffff81043fea
2.38% sleep perf [.] 0x00000000000459da
2.29% sleep [kernel.kallsyms] [k] 0xffffffff813548c3
2.05% java perf-3109.map [.] 0x00007f84d5206071
2.05% indicator-cpufr libgobject-2.0.so.0.3200.3 [.] 0x0000000000031787
2.05% compiz libc-2.15.so [.] 0x0000000000082fa6
2.02% chromium-browse libflashplayer.so [.] 0x0000000000803fe7
1.88% java libglib-2.0.so.0.3200.3 [.] 0x0000000000045619
1.72% chromium-browse libglib-2.0.so.0.3200.3 [.] 0x0000000000019930
1.64% chromium-browse libpthread-2.15.so [.] 0x000000000000cd60
1.02% Xorg [kernel.kallsyms] [k] 0xffffffff81044c1d
0.62% swapper [i915] [k] 0x0000000000000ce5
0.62% Xorg [i915] [k] 0x0000000000018a80
0.51% Xorg Xorg [.] 0x000000000013a619
0.29% kworker/0:1 [kernel.kallsyms] [k] 0xffffffff81096afc
result of sudo perf record dd if=/dev/zero of=/dev/null:
# Overhead Command Shared Object Symbol
# ........ ....... ................. ......
#
76.89% dd [kernel.kallsyms] [k] 0xffffffff81043fea
13.91% dd libc-2.15.so [.] 0x000000000014815f
9.21% dd dd [.] 0x0000000000004889
result of sudo perf record ping 10.0.0.1:
# Overhead Command Shared Object Symbol
# ........ ....... ................. ......
#
64.59% ping ld-2.15.so [.] 0x00000000000188d2
35.41% ping [kernel.kallsyms] [k] 0xffffffff81043fea
--
Regards,
Chao Xu
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