[GIT PULL] perf/urgent for v6.11-rc7

[GIT PULL] perf/urgent for v6.11-rc7

[Borislav Petkov]

Hi Linus,

please pull two urgent perf fixes for v6.11-rc7.

Thx.

---

The following changes since commit 25dfc9e357af8aed1ca79b318a73f2c59c1f0b2b:

  perf/x86/intel: Limit the period on Haswell (2024-08-25 16:49:05 +0200)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip tags/perf_urgent_for_v6.11_rc7

for you to fetch changes up to 2ab9d830262c132ab5db2f571003d80850d56b2a:

  perf/aux: Fix AUX buffer serialization (2024-09-04 18:22:56 +0200)

----------------------------------------------------------------
- Fix perf's AUX buffer serialization

- Prevent uninitialized struct members in perf's uprobes handling

----------------------------------------------------------------
Peter Zijlstra (1):
      perf/aux: Fix AUX buffer serialization

Sven Schnelle (1):
      uprobes: Use kzalloc to allocate xol area

 kernel/events/core.c        | 18 ++++++++++++------
 kernel/events/internal.h    |  1 +
 kernel/events/ring_buffer.c |  2 ++
 kernel/events/uprobes.c     |  3 +--
 4 files changed, 16 insertions(+), 8 deletions(-)


-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [GIT PULL] perf/urgent for v6.11-rc7

[pr-tracker-bot]

The pull request you sent on Sun, 8 Sep 2024 11:07:59 +0200:

> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip tags/perf_urgent_for_v6.11_rc7

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/e20398877b6216023ac311053baf2f50965cbf27

Thank you!

-- 
Deet-doot-dot, I am a bot.
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Re: [GIT pull] perf/urgent for v6.11-rc7

[pr-tracker-bot]

The pull request you sent on Sun,  1 Sep 2024 13:44:02 +0200 (CEST):

> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-2024-09-01

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/3df9427f351a9cb8aee0eea13d185f0d78340a70

Thank you!

-- 
Deet-doot-dot, I am a bot.
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[GIT pull] perf/urgent for v6.11-rc7

[Thomas Gleixner]

Linus,

please pull the latest perf/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-2024-09-01

up to:  25dfc9e357af: perf/x86/intel: Limit the period on Haswell

A single fix for x86 performance monitoring:

  Haswell PMUs suffer from several errata and require to limit the minimal
  period for counter events, otherwise they suffer from endless loops in
  the PMU interrupt.

Thanks,

	tglx

------------------>
Kan Liang (1):
      perf/x86/intel: Limit the period on Haswell


 arch/x86/events/intel/core.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 0c9c2706d4ec..9e519d8a810a 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -4589,6 +4589,25 @@ static enum hybrid_cpu_type adl_get_hybrid_cpu_type(void)
 	return HYBRID_INTEL_CORE;
 }
 
+static inline bool erratum_hsw11(struct perf_event *event)
+{
+	return (event->hw.config & INTEL_ARCH_EVENT_MASK) ==
+		X86_CONFIG(.event=0xc0, .umask=0x01);
+}
+
+/*
+ * The HSW11 requires a period larger than 100 which is the same as the BDM11.
+ * A minimum period of 128 is enforced as well for the INST_RETIRED.ALL.
+ *
+ * The message 'interrupt took too long' can be observed on any counter which
+ * was armed with a period < 32 and two events expired in the same NMI.
+ * A minimum period of 32 is enforced for the rest of the events.
+ */
+static void hsw_limit_period(struct perf_event *event, s64 *left)
+{
+	*left = max(*left, erratum_hsw11(event) ? 128 : 32);
+}
+
 /*
  * Broadwell:
  *
@@ -4606,8 +4625,7 @@ static enum hybrid_cpu_type adl_get_hybrid_cpu_type(void)
  */
 static void bdw_limit_period(struct perf_event *event, s64 *left)
 {
-	if ((event->hw.config & INTEL_ARCH_EVENT_MASK) ==
-			X86_CONFIG(.event=0xc0, .umask=0x01)) {
+	if (erratum_hsw11(event)) {
 		if (*left < 128)
 			*left = 128;
 		*left &= ~0x3fULL;
@@ -6766,6 +6784,7 @@ __init int intel_pmu_init(void)
 
 		x86_pmu.hw_config = hsw_hw_config;
 		x86_pmu.get_event_constraints = hsw_get_event_constraints;
+		x86_pmu.limit_period = hsw_limit_period;
 		x86_pmu.lbr_double_abort = true;
 		extra_attr = boot_cpu_has(X86_FEATURE_RTM) ?
 			hsw_format_attr : nhm_format_attr;