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44530d588e
linux/arch/x86/kernel/apic
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Ingo Molnar 44530d588e Revert "perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86" 
This reverts commit 2c95afc1e8.

Stephane reported the following regression:

 > Since Andi added:
 >
 > commit 2c95afc1e8
 > Author: Andi Kleen <ak@linux.intel.com>
 > Date:   Thu Jun 9 06:14:38 2016 -0700
 >
 >    perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86
 >
 > $ perf stat -e ref-cycles ls
 >   <not counted> ....
 >
 > fails systematically because the ref-cycles is now used by the
 > watchdog and given this is a system-wide pinned event, it monopolizes
 > the fixed counter 2 which is the only counter able to measure this event.

Since the next merge window is near, fix the regression for now
by reverting the commit.

Reported-by: Stephane Eranian <eranian@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-10 20:58:36 +02:00
..
apic_flat_64.c x86/apic: Deinline _flat_send_IPI_mask, save ~150 bytes 2016-03-08 12:26:41 +01:00
apic_noop.c x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage 2016-04-13 11:37:41 +02:00
apic_numachip.c x86/cpufeature: Replace the old static_cpu_has() with safe variant 2016-01-30 11:22:18 +01:00
apic.c x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage 2016-04-13 11:37:41 +02:00
bigsmp_32.c x86/apic: Wire up single IPI for bigsmp_apic 2015-11-05 13:07:52 +01:00
htirq.c x86: Constify irqdomain ops 2015-05-05 11:14:48 +02:00
hw_nmi.c Revert "perf/x86/intel, watchdog: Switch NMI watchdog to ref cycles on x86" 2016-07-10 20:58:36 +02:00
io_apic.c x86/ioapic: Fix incorrect pointers in ioapic_setup_resources() 2016-06-10 14:45:54 +02:00
ipi.c x86/cpufeature: Replace cpu_has_apic with boot_cpu_has() usage 2016-04-13 11:37:41 +02:00
Makefile kernel: add kcov code coverage 2016-03-22 15:36:02 -07:00
msi.c x86/irq: Export functions to allow MSI domains in modules 2015-12-20 12:40:49 +01:00
probe_32.c x86/apic: Use default send single IPI wrapper 2015-11-05 13:07:53 +01:00
probe_64.c x86/platform: Introduce APIC post-initialization callback 2012-06-06 09:06:19 +02:00
vector.c Merge branch 'x86/urgent' into x86/asm, to refresh the tree 2016-04-29 11:55:04 +02:00
x2apic_cluster.c x86/apic: Implement single target IPI function for x2apic_cluster 2015-11-05 13:07:52 +01:00
x2apic_phys.c x86/apic: Implement single IPI for x2apic_phys 2015-11-05 13:07:53 +01:00
x2apic_uv_x.c Merge branch 'x86/urgent' into x86/platform, to resolve conflict 2016-05-05 09:56:10 +02:00