linux-kernel - [tip: perf/urgent] perf/x86/intel: Restrict period on Nehalem

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Message-ID: <156724236470.10774.16768356657393096116.tip-bot2@tip-bot2>
Date:   Sat, 31 Aug 2019 09:06:04 -0000
From:   "tip-bot2 for Josh Hunt" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>, acme@...nel.org,
        Josh Hunt <johunt@...mai.com>, bpuranda@...mai.com,
        mingo@...hat.com, jolsa@...hat.com, tglx@...utronix.de,
        namhyung@...nel.org, alexander.shishkin@...ux.intel.com,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/urgent] perf/x86/intel: Restrict period on Nehalem

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     44d3bbb6f5e501b873218142fe08cdf62a4ac1f3
Gitweb:        https://git.kernel.org/tip/44d3bbb6f5e501b873218142fe08cdf62a4ac1f3
Author:        Josh Hunt <johunt@...mai.com>
AuthorDate:    Mon, 19 Aug 2019 19:13:31 -04:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 30 Aug 2019 14:27:47 +02:00

perf/x86/intel: Restrict period on Nehalem

We see our Nehalem machines reporting 'perfevents: irq loop stuck!' in
some cases when using perf:

perfevents: irq loop stuck!
WARNING: CPU: 0 PID: 3485 at arch/x86/events/intel/core.c:2282 intel_pmu_handle_irq+0x37b/0x530
...
RIP: 0010:intel_pmu_handle_irq+0x37b/0x530
...
Call Trace:
<NMI>
? perf_event_nmi_handler+0x2e/0x50
? intel_pmu_save_and_restart+0x50/0x50
perf_event_nmi_handler+0x2e/0x50
nmi_handle+0x6e/0x120
default_do_nmi+0x3e/0x100
do_nmi+0x102/0x160
end_repeat_nmi+0x16/0x50
...
? native_write_msr+0x6/0x20
? native_write_msr+0x6/0x20
</NMI>
intel_pmu_enable_event+0x1ce/0x1f0
x86_pmu_start+0x78/0xa0
x86_pmu_enable+0x252/0x310
__perf_event_task_sched_in+0x181/0x190
? __switch_to_asm+0x41/0x70
? __switch_to_asm+0x35/0x70
? __switch_to_asm+0x41/0x70
? __switch_to_asm+0x35/0x70
finish_task_switch+0x158/0x260
__schedule+0x2f6/0x840
? hrtimer_start_range_ns+0x153/0x210
schedule+0x32/0x80
schedule_hrtimeout_range_clock+0x8a/0x100
? hrtimer_init+0x120/0x120
ep_poll+0x2f7/0x3a0
? wake_up_q+0x60/0x60
do_epoll_wait+0xa9/0xc0
__x64_sys_epoll_wait+0x1a/0x20
do_syscall_64+0x4e/0x110
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fdeb1e96c03
...
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: acme@...nel.org
Cc: Josh Hunt <johunt@...mai.com>
Cc: bpuranda@...mai.com
Cc: mingo@...hat.com
Cc: jolsa@...hat.com
Cc: tglx@...utronix.de
Cc: namhyung@...nel.org
Cc: alexander.shishkin@...ux.intel.com
Link: https://lkml.kernel.org/r/1566256411-18820-1-git-send-email-johunt@akamai.com
---
 arch/x86/events/intel/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 648260b..e4c2cb6 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3572,6 +3572,11 @@ static u64 bdw_limit_period(struct perf_event *event, u64 left)
 	return left;
 }
 
+static u64 nhm_limit_period(struct perf_event *event, u64 left)
+{
+	return max(left, 32ULL);
+}
+
 PMU_FORMAT_ATTR(event,	"config:0-7"	);
 PMU_FORMAT_ATTR(umask,	"config:8-15"	);
 PMU_FORMAT_ATTR(edge,	"config:18"	);
@@ -4606,6 +4611,7 @@ __init int intel_pmu_init(void)
 		x86_pmu.pebs_constraints = intel_nehalem_pebs_event_constraints;
 		x86_pmu.enable_all = intel_pmu_nhm_enable_all;
 		x86_pmu.extra_regs = intel_nehalem_extra_regs;
+		x86_pmu.limit_period = nhm_limit_period;
 
 		mem_attr = nhm_mem_events_attrs;