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authorZhang, Yanmin <yanmin_zhang@linux.intel.com>2010-03-18 11:36:04 -0300
committerIngo Molnar <mingo@elte.hu>2010-03-18 16:21:11 +0100
commit46be604b5ba738d53e5f5314813a4e7092864baf (patch)
treee06fa3a1bc3ed6c2bd10c2379fa5478522477baa /Makefile
parent6be2850effd6a8bae11d623c8c52e88d2fbc0e96 (diff)
perf record: Enable counters only when kernel is execing subcommand
'perf record' starts counters before subcommand is execed, so the statistics is not precise because it includes data of some preparation steps. I fix it with the patch. In addition, change the condition to fork/exec subcommand. If there is a subcommand parameter, perf always fork/exec it. The usage example is: # perf record -f -a sleep 10 So this command could collect statistics for 10 seconds precisely. User still could stop it by CTRL+C. Without the new capability, user could only input CTRL+C to stop it without precise time clock. Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Avi Kivity <avi@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Sheng Yang <sheng@linux.intel.com> Cc: oerg Roedel <joro@8bytes.org> Cc: Jes Sorensen <Jes.Sorensen@redhat.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Cc: <zhiteng.huang@intel.com> Cc: Zachary Amsden <zamsden@redhat.com> LKML-Reference: <1268922965-14774-2-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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