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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-06-02 16:08:20 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-02 21:45:31 +0200
commite4abb5d4f7ddabc1fc7c392cf0a10d8e5868c9ca (patch)
tree9d9c71a70afd922d4b371b0243ab149456d634ca /kernel
parent8a016db386195b193e2a8aeddff9fe937dcb7a40 (diff)
perf_counter: x86: Emulate longer sample periods
Do as Power already does, emulate sample periods up to 2^63-1 by composing them of smaller values limited by hardware capabilities. Only once we wrap the software period do we generate an overflow event. Just 10 lines of new code. Reported-by: Stephane Eranian <eranian@googlemail.com> Signed-off-by: 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: Thomas Gleixner <tglx@linutronix.de> Cc: John Kacur <jkacur@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
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