That first cup of coffee is so important. On 3/2/12 3:56 AM, Ingo Molnar wrote:
phoenix:~> perf record -a sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.023 MB perf.data (~988 samples) ] phoenix:~> perf report --stdio Warning: The perf.data file has no samples! # ======== # captured on: Fri Mar 2 12:01:41 2012 # hostname : phoenix # os release : 3.3.0-rc5+ # perf version : 3.3.rc5.1698.g68a63a.dirty # arch : x86_64 # nrcpus online : 16 # nrcpus avail : 16 # cpudesc : Quad-Core AMD Opteron(tm) Processor 8356 # cpuid : AuthenticAMD,16,2,3
Would you mind adding this patch: https://lkml.org/lkml/2012/2/29/217 and see if it fixes your problem? Quick test with an updated tree: $ /tmp/pbuild/perf record -a sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.046 MB perf.data (~1990 samples) ] $ /tmp/pbuild/perf script <samples dumped> $ /tmp/pbuild/perf --version perf version perf.core.for.mingo.36.g8eedce This is your tip.git repository, tip/perf/core branch: [remote "tip"] url = git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git fetch = +refs/heads/*:refs/remotes/tip/* [branch "tip-perf-core"] remote = tip merge = refs/heads/perf/coreI did noticed that this branch only shows 3.3.0-rc2 as the latest kernel version.
# total memory : 33012240 kB # cmdline : /home/mingo/bin/perf record -a sleep 1 # event : name = cycles, type = 0, config = 0x0, config1 = 0x0, config2 = 0x0, excl_usr = 0, excl_k # HEADER_CPU_TOPOLOGY info available, use -I to display # HEADER_NUMA_TOPOLOGY info available, use -I to display # ======== phoenix:~> perf --version perf version 3.3.rc5.1698.g68a63a.dirty phoenix:~> The later fixes to b52956c9, such as: 6b1bee9035d4: perf tools: fix broken perf record -a mode did not fix this system - it's still broken as of today's -tip. Another system running the same kernel does not exhibit this problem, so it's somehow specific to this system.
Is the other system Intel based? David -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html