linux-kernel - Re: [PATCH 1/2] Revert "mm: don't reclaim inodes with many attached pages"

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Date:   Wed, 30 Jan 2019 12:21:07 +0000
From:   Chris Mason <clm@...com>
To:     Dave Chinner <david@...morbit.com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        Roman Gushchin <guro@...com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "vdavydov.dev@...il.com" <vdavydov.dev@...il.com>
Subject: Re: [PATCH 1/2] Revert "mm: don't reclaim inodes with many attached
 pages"



On 29 Jan 2019, at 23:17, Dave Chinner wrote:

> From: Dave Chinner <dchinner@...hat.com>
>
> This reverts commit a76cf1a474d7dbcd9336b5f5afb0162baa142cf0.
>
> This change causes serious changes to page cache and inode cache
> behaviour and balance, resulting in major performance regressions
> when combining worklaods such as large file copies and kernel
> compiles.
>
> https://bugzilla.kernel.org/show_bug.cgi?id=202441

I'm a little confused by the latest comment in the bz:

https://bugzilla.kernel.org/show_bug.cgi?id=202441#c24

Are these reverts sufficient?

Roman beat me to suggesting Rik's followup.  We hit a different problem 
in prod with small slabs, and have a lot of instrumentation on Rik's 
code helping.

-chris