linux_dsm_epyc7002/arch
Stephane Eranian d76a0812ac perf_events: Add new start/stop PMU callbacks
In certain situations, the kernel may need to stop and start the same
event rapidly. The current PMU callbacks do not distinguish between stop
and release (i.e., stop + free the resource). Thus, a counter may be
released, then it will be immediately re-acquired. Event scheduling will
again take place with no guarantee to assign the same counter. On some
processors, this may event yield to failure to assign the event back due
to competion between cores.

This patch is adding a new pair of callback to stop and restart a counter
without actually release the underlying counter resource. On stop, the
counter is stopped, its values saved and that's it. On start, the value
is reloaded and counter is restarted (on x86, actual restart is delayed
until perf_enable()).

Signed-off-by: Stephane Eranian <eranian@google.com>
[ added fallback to ->enable/->disable for all other PMUs
  fixed x86_pmu_start() to call x86_pmu.enable()
  merged __x86_pmu_disable into x86_pmu_stop() ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4b703875.0a04d00a.7896.ffffb824@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-02-26 10:56:53 +01:00
..
alpha alpha: cpumask_of_node() should handle -1 as a node 2010-01-14 13:21:35 -05:00
arm Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 2010-01-25 18:56:12 -08:00
avr32 Merge branch 'for-33' of git://repo.or.cz/linux-kbuild 2009-12-17 07:23:42 -08:00
blackfin blackfin,kgdb: Do not put PC in gdb_regs into retx. 2010-01-07 11:58:37 -06:00
cris Merge branch 'for-33' of git://repo.or.cz/linux-kbuild 2009-12-17 07:23:42 -08:00
frv FDPIC: Respect PT_GNU_STACK exec protection markings when creating NOMMU stack 2010-01-06 18:16:02 -08:00
h8300 Merge branch 'for-33' of git://repo.or.cz/linux-kbuild 2009-12-17 07:23:42 -08:00
ia64 kprobes: Disable booster when CONFIG_PREEMPT=y 2010-02-04 09:36:18 +01:00
m32r elf: kill USE_ELF_CORE_DUMP 2009-12-16 07:20:12 -08:00
m68k m68knommu: fix definitions of __pa() and __va() 2010-01-12 20:51:45 -08:00
m68knommu m68knommu: fix invalid flags on coldfire pit clocksource 2010-01-16 12:15:38 -08:00
microblaze microblaze: pci_controller->arch_data really is a struct device_node * 2010-01-18 16:36:07 +01:00
mips MIPS: Ignore vmlinux.* 2010-01-12 18:19:38 +01:00
mn10300 mn10300: update the ASB2303 defconfig 2010-01-11 09:34:10 -08:00
parisc Merge branch 'for-33' of git://repo.or.cz/linux-kbuild 2009-12-17 07:23:42 -08:00
powerpc Merge branch 'perf/urgent' into perf/core 2010-01-29 10:36:22 +01:00
s390 KVM: S390: fix potential array overrun in intercept handling 2010-01-25 12:26:39 -02:00
score mm: make totalhigh_pages unsigned long 2010-01-11 09:34:03 -08:00
sh Merge branch 'perf/urgent' into perf/core 2010-01-29 10:36:22 +01:00
sparc sparc64: Fix IRQ ->set_affinity() methods. 2010-01-20 19:30:49 -08:00
um Unrot uml mconsole a bit 2010-01-14 09:05:26 -05:00
x86 perf_events: Add new start/stop PMU callbacks 2010-02-26 10:56:53 +01:00
xtensa Merge branch 'for-33' of git://repo.or.cz/linux-kbuild 2009-12-17 07:23:42 -08:00
.gitignore
Kconfig hw-breakpoints: Fix hardware breakpoints -> perf events dependency 2009-12-18 13:11:51 +01:00