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851559e35f
linux/arch/x86/kernel/cpu
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Yan, Zheng 851559e35f perf/x86/intel: Use the PEBS auto reload mechanism when possible 
When a fixed period is specified, this patch makes perf use the PEBS
auto reload mechanism. This makes normal profiling faster, because
it avoids one costly MSR write in the PMI handler.

However, the reset value will be loaded by hardware assist. There is a
small delay compared to the previous non-auto-reload mechanism. The
delay time is arbitrary, but very small. The assist cost is 400-800
cycles, assuming common cases with everything cached. The minimum period
the patch currently uses is 10000. In that extreme case it can be ~10%
if cycles are used.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@infradead.org
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/1430940834-8964-2-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-06-07 16:08:35 +02:00
..
mcheck Merge branch 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-13 13:33:20 -07:00
microcode x86/microcode/amd: Drop the pci_ids.h dependency 2015-03-31 09:54:32 +02:00
mtrr x86: mtrr: if: remove use of seq_printf return value 2015-04-15 16:35:24 -07:00
.gitignore
amd.c x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue 2015-04-26 17:57:38 -07:00
bugs_64.c
bugs.c x86: Get rid of ->hard_math and all the FPU asm fu 2013-06-06 14:32:04 -07:00
centaur.c x86: Remove CONFIG_X86_OOSTORE 2014-03-11 10:16:18 -07:00
common.c Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-04-14 14:37:47 -07:00
cpu.h x86/cpu: Track legacy CPU model data only on 32-bit kernels 2013-10-26 13:34:39 +02:00
cyrix.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
hypervisor.c hypervisor/x86/xen: Unset X86_BUG_SYSRET_SS_ATTRS on Xen PV guests 2015-05-05 18:27:43 +01:00
intel_cacheinfo.c x86/cpu/cacheinfo: Fix cache_get_priv_group() for Intel processors 2015-03-23 10:22:38 +01:00
intel_pt.h perf/x86/intel/pt: Add Intel PT PMU driver 2015-04-02 17:14:20 +02:00
intel.c x86/cpu/intel: Fix trivial typo in intel_tlb_table[] 2015-02-22 08:55:58 +01:00
Makefile perf/x86/intel/bts: Add BTS PMU driver 2015-04-02 17:14:21 +02:00
match.c x86: align x86 arch with generic CPU modalias handling 2014-02-18 12:45:38 -08:00
mkcapflags.sh x86/build: Fix mkcapflags.sh bash-ism 2015-02-19 02:21:00 +01:00
mshyperv.c x86, hyperv: Mark the Hyper-V clocksource as being continuous 2015-01-20 14:36:25 +01:00
perf_event_amd_ibs.c perf/x86/amd/ibs: Convert force_ibs_eilvt_setup() to void 2015-02-18 17:01:46 +01:00
perf_event_amd_iommu.c cpumask: factor out show_cpumap into separate helper function 2014-11-07 11:45:00 -08:00
perf_event_amd_iommu.h perf/x86/amd: AMD IOMMU Performance Counter PERF uncore PMU implementation 2013-06-19 13:04:53 +02:00
perf_event_amd_uncore.c cpumask: factor out show_cpumap into separate helper function 2014-11-07 11:45:00 -08:00
perf_event_amd.c perf/x86: Add 'index' param to get_event_constraint() callback 2015-04-02 17:33:10 +02:00
perf_event_intel_bts.c perf/x86/intel/pt: Fix the 32-bit build 2015-04-02 17:58:45 +02:00
perf_event_intel_cqm.c perf/x86/intel/cqm: Use 'u32' data type for RMIDs 2015-05-27 09:17:41 +02:00
perf_event_intel_ds.c perf/x86/intel: Use the PEBS auto reload mechanism when possible 2015-06-07 16:08:35 +02:00
perf_event_intel_lbr.c perf/x86/intel: add support for PERF_SAMPLE_BRANCH_IND_JUMP 2015-06-07 16:08:27 +02:00
perf_event_intel_pt.c perf/x86/intel/pt: Remove redundant variable declaration 2015-05-27 09:17:48 +02:00
perf_event_intel_rapl.c perf/x86/rapl: Enable Broadwell-U RAPL support 2015-05-11 11:52:30 +02:00
perf_event_intel_uncore_nhmex.c perf/x86/uncore: Fix coccinelle warnings 2014-08-13 07:51:09 +02:00
perf_event_intel_uncore_snb.c perf/x86/intel/uncore: Add Broadwell-U uncore IMC PMU support 2015-05-11 11:57:47 +02:00
perf_event_intel_uncore_snbep.c perf/x86/intel/uncore: Delete an unnecessary check before pci_dev_put() call 2015-02-18 17:01:42 +01:00
perf_event_intel_uncore.c Merge branch 'perf/urgent' into perf/core, before applying dependent patches 2015-05-27 09:17:21 +02:00
perf_event_intel_uncore.h Merge branch 'perf/urgent' into perf/core, before applying dependent patches 2015-05-27 09:17:21 +02:00
perf_event_intel.c perf/x86/intel: Use the PEBS auto reload mechanism when possible 2015-06-07 16:08:35 +02:00
perf_event_knc.c x86: Replace __get_cpu_var uses 2014-08-26 13:45:49 -04:00
perf_event_p4.c x86: Replace __get_cpu_var uses 2014-08-26 13:45:49 -04:00
perf_event_p6.c perf/x86/intel/p6: Add userspace RDPMC quirk for PPro 2014-02-09 13:08:24 +01:00
perf_event.c perf/x86/intel: Use the PEBS auto reload mechanism when possible 2015-06-07 16:08:35 +02:00
perf_event.h perf/x86/intel: Use the PEBS auto reload mechanism when possible 2015-06-07 16:08:35 +02:00
perfctr-watchdog.c perf/x86: Add support for Intel Xeon-Phi Knights Corner PMU 2012-10-04 13:32:37 +02:00
powerflags.c update AMD powerflags comments 2013-05-28 12:02:10 +02:00
proc.c x86: Replace seq_printf() with seq_puts() 2014-12-08 11:48:15 +01:00
rdrand.c x86, rdrand: When nordrand is specified, disable RDSEED as well 2014-05-11 20:25:20 -07:00
scattered.c x86: Add Intel Processor Trace (INTEL_PT) cpu feature detection 2015-04-02 17:14:18 +02:00
topology.c x86: delete __cpuinit usage from all x86 files 2013-07-14 19:36:56 -04:00
transmeta.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
umc.c x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
vmware.c x86: Correctly detect hypervisor 2013-08-05 06:35:33 -07:00