linux-kernel - [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation.

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Message-ID: <CAG-aW04bcQf-Li7ciNjXe086_XqGbUe0=gq4NH_yoJ8ns6G8eQ@mail.gmail.com>
Date:	Mon, 2 Mar 2015 20:17:22 +0100
From:	Matt <jackdachef@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Will Deacon <will.deacon@....com>, Dave Hansen <dave@...1.net>
Subject: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant
 performance degradation.

Hi Dave,


is the following thread and patch related to your problem,

I just happened to stumble upon it a few days ago:

https://lkml.org/lkml/2014/12/17/280 ,
http://marc.info/?l=linux-kernel&m=141876582909898&w=2
Re: post-3.18 performance regression in TLB flushing code

Linus already posted a fix to the problem, however I can't seem to
find the matching commit in his tree (searching for "TLC regression"
or "TLB cache").


Kind Regards

Matt
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