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authorIngo Molnar <mingo@elte.hu>2009-08-11 10:40:08 +0200
committerIngo Molnar <mingo@elte.hu>2009-08-12 14:12:49 +0200
commit04da8a43da804723a550f00dd158fd5b5e25ae35 (patch)
tree002fa5e83efaa745b7eaddd329c2aa9d79d2d2f6 /tools/perf/builtin-list.c
parent0a5ac84650fb7a7f226814103d95724e34b012ae (diff)
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perf_counter, x86: Fix/improve apic fallback
Johannes Stezenbach reported that his Pentium-M based laptop does not have the local APIC enabled by default, and hence perfcounters do not get initialized. Add a fallback for this case: allow non-sampled counters and return with an error on sampled counters. This allows 'perf stat' to work out of box - and allows 'perf top' and 'perf record' to fall back on a hrtimer based sampling method. ( Passing 'lapic' on the boot line will allow hardware sampling to occur - but if the APIC is disabled permanently by the hardware then this fallback still allows more systems to use perfcounters. ) Also decouple perfcounter support from X86_LOCAL_APIC. -v2: fix typo breaking counters on all other systems ... Reported-by: Johannes Stezenbach <js@sig21.net> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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