linux-kernel - [PATCH 0/7] perpcu rwsem, fs/locks and killing lglocks

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Date:   Mon, 05 Sep 2016 21:40:54 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     oleg@...hat.com, paulmck@...ux.vnet.ibm.com, tj@...nel.org,
        mingo@...hat.com, linux-kernel@...r.kernel.org, der.herr@...r.at,
        peterz@...radead.org, dave@...olabs.net, riel@...hat.com,
        viro@...IV.linux.org.uk, torvalds@...ux-foundation.org,
        wagi@...om.org
Subject: [PATCH 0/7] perpcu rwsem, fs/locks and killing lglocks

Hi all,

Here are some patches that I've been sitting on for far too long now.

They're a respin of earlier work [1], and have been verified by Daniel Wagner
to not suffer the regression he measured with the previous set (part of which
was operator error).

Patches 4 and 5 were needed to solve a (smallish) performance regression on
CONFIG_PREEMPT=y. They avoid a number of preemption points (and code).

I was going to gather pretty numbers from Daniels data, but I keep putting that
off and figured I ought to send the patches already.

[1] https://lkml.kernel.org/r/20150622121623.291363374@infradead.org

---
 Documentation/locking/lglock.txt | 166 ---------------------------------------
 fs/Kconfig                       |   1 +
 fs/locks.c                       |  68 +++++++++++-----
 include/linux/lglock.h           |  81 -------------------
 include/linux/percpu-rwsem.h     |  36 +++++++--
 kernel/locking/Makefile          |   1 -
 kernel/locking/lglock.c          | 111 --------------------------
 kernel/stop_machine.c            |  42 ++++++----
 8 files changed, 107 insertions(+), 399 deletions(-)