linux-kernel - [PATCH v7 0/2] perf/core: addressing 4x slowdown during per-process profiling of STREAM benchmark on Intel Xeon Phi

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Message-ID: <d676ecc5-488a-e82c-b85d-ccc8e0f02c4e@linux.intel.com>
Date:   Fri, 18 Aug 2017 08:17:15 +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>,
        Stephane Eranian <eranian@...gle.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH v7 0/2] perf/core: addressing 4x slowdown during per-process
 profiling of STREAM benchmark on Intel Xeon Phi

Hi,

This patch set v7 moves event groups into rb trees and implements 
skipping to the current CPU's list on hrtimer interrupt.

Events allocated for the same CPU are still kept in a linked list
of the event directly attached to the tree because it is unclear 
how to implement fast iteration thru events allocated for 
the same CPU when they are all attached to a tree employing 
additional 64bit index as a secondary treee key.

The patch set addresses feeback captured previously. Specifically
API with a callback in signature is replaced by a macro what reduced
the size of adapting changes.

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.

For more background details and feedback of the patch set please 
refer to v6 and older.

Thanks,
Alexey

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

 include/linux/perf_event.h |  19 +-
 kernel/events/core.c       | 463 ++++++++++++++++++++++++++++++++++-----------
 2 files changed, 364 insertions(+), 118 deletions(-)