From: Andi Kleen <andi@firstfloor.org>
To: Kan Liang <kan.liang@intel.com>
Cc: peterz@infradead.org, mingo@kernel.org, acme@infradead.org,
eranian@google.com, andi@firstfloor.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH V8 3/8] perf, x86: handle multiple records in PEBS buffer
Date: Fri, 8 May 2015 13:05:47 +0200 [thread overview]
Message-ID: <20150508110547.GS2366@two.firstfloor.org> (raw)
In-Reply-To: <1430940834-8964-4-git-send-email-kan.liang@intel.com>
> The first issue is that the 'status' field of the PEBS record is a copy
> of the GLOBAL_STATUS MSR at PEBS assist time. To see why this is a
I wanted to mention that Skylake has this issue fixed. The status
field in PEBS is now only the counter that triggered the PEBS record.
> The second issue is that the hardware will only emit one record for two
> or more counters if the event that triggers the assist is 'close'. The
If two events gets merged it is one or the other.
-Andi
next prev parent reply other threads:[~2015-05-08 11:05 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-06 19:33 [PATCH V8 0/8] large PEBS interrupt threshold Kan Liang
2015-05-06 19:33 ` [PATCH V8 1/8] perf, x86: use the PEBS auto reload mechanism when possible Kan Liang
2015-06-07 17:49 ` [tip:perf/core] perf/x86/intel: Use " tip-bot for Yan, Zheng
2015-05-06 19:33 ` [PATCH V8 2/8] perf, x86: introduce setup_pebs_sample_data() Kan Liang
2015-06-07 17:49 ` [tip:perf/core] perf/x86/intel: Introduce setup_pebs_sample_data( ) tip-bot for Yan, Zheng
2015-05-06 19:33 ` [PATCH V8 3/8] perf, x86: handle multiple records in PEBS buffer Kan Liang
2015-05-08 11:05 ` Andi Kleen [this message]
2015-05-08 11:29 ` Peter Zijlstra
2015-06-07 17:49 ` [tip:perf/core] perf/x86/intel: Handle multiple records in the " tip-bot for Yan, Zheng
2015-05-06 19:33 ` [PATCH V8 4/8] perf, x86: large PEBS interrupt threshold Kan Liang
2015-06-07 17:49 ` [tip:perf/core] perf/x86/intel: Implement batched PEBS interrupt handling (large PEBS interrupt threshold ) tip-bot for Yan, Zheng
2015-05-06 19:33 ` [PATCH V8 5/8] perf, x86: drain PEBS buffer during context switch Kan Liang
2015-06-07 17:50 ` [tip:perf/core] perf/x86/intel: Drain the PEBS buffer during context switches tip-bot for Yan, Zheng
2015-05-06 19:33 ` [PATCH V8 6/8] perf, x86: enlarge PEBS buffer Kan Liang
2015-06-07 17:50 ` [tip:perf/core] perf/intel/x86: Enlarge the " tip-bot for Yan, Zheng
2015-05-06 19:33 ` [PATCH V8 7/8] perf, x86: introduce PERF_RECORD_LOST_SAMPLES Kan Liang
2015-05-07 11:35 ` Peter Zijlstra
2015-05-07 11:54 ` Peter Zijlstra
2015-05-07 14:15 ` Arnaldo Carvalho de Melo
2015-05-07 14:21 ` Arnaldo Carvalho de Melo
2015-05-07 14:39 ` Peter Zijlstra
2015-05-07 16:22 ` Arnaldo Carvalho de Melo
2015-05-07 17:37 ` Peter Zijlstra
2015-05-07 20:01 ` Arnaldo Carvalho de Melo
2015-05-07 13:56 ` Liang, Kan
2015-05-07 13:58 ` Peter Zijlstra
2015-05-06 19:33 ` [PATCH V8 8/8] perf tools: handle PERF_RECORD_LOST_SAMPLES Kan Liang
2015-05-07 10:33 ` Andi Kleen
2015-05-07 14:17 ` Liang, Kan
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