linux-kernel - [PATCH v9 0/2] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi

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Message-ID: <4d83cc42-37c5-ed06-63ad-c71bbf7f4952@linux.intel.com>
Date:   Thu, 31 Aug 2017 12:53:29 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Andi Kleen <ak@...ux.intel.com>, Kan Liang <kan.liang@...el.com>,
        Dmitri Prokhorov <Dmitry.Prohorov@...el.com>,
        Valery Cherepennikov <valery.cherepennikov@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH v9 0/2] perf/core: addressing 4x slowdown during per-process
 profiling of STREAM benchmark on Intel Xeon Phi

Hi,

This patch set v9 addresses feedback captured on review of v7. For more 
background details please refer to v7 and earlier.

Specifically in this version groups are kept in a single tree indexed by
CPU and then by a 64bit virtual index.

In this version mux switch is renamed to rotation switch 
and the value of rotation switch may be the one of defined by 
ROTATION_DISABLED or ROTATION_ENABLED macros.

ctx->rotate_disable bool flag is renamed to ctx->rotation and also employs
ROTATION_DISABLE and ROTATION_ENABLED macros.

pinned_group_sched_in() and flexible_group_sched_in() API are introduced 
to consolidate code enabling a whole group from pinned and flexible 
groups appropriately.

Patches in the set are expected to be applied one after another in 
the mentioned order and they are logically split into two parts 
to simplify the review process.

Thanks,
Alexey

---
 Alexey Budankov (2):
	perf/core: use rb trees for pinned/flexible groups
	perf/core: add rotation switch to skip to the current CPU's events list on mux interrupt

 include/linux/perf_event.h |  17 +-
 kernel/events/core.c       | 500 +++++++++++++++++++++++++++++++++------------
 2 files changed, 382 insertions(+), 135 deletions(-)