linux-kernel - Re: [PATCH 4.4 50/92] mm: filemap: avoid unnecessary calls to lock_page when waiting for IO to complete during a read

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Message-ID: <20180524131237.soy6jm3ji2pe66id@suse.de>
Date:   Thu, 24 May 2018 14:12:37 +0100
From:   Mel Gorman <mgorman@...e.de>
To:     Jan Kara <jack@...e.cz>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 4.4 50/92] mm: filemap: avoid unnecessary calls to
 lock_page when waiting for IO to complete during a read

On Thu, May 24, 2018 at 02:02:37PM +0200, Jan Kara wrote:
> > This is in the SLES kernel for a reason, and again, it's in the section
> > that says "this should be pushed to stable".  So if it's good enough for
> > the SLES kernel, why isn't it good enough for all users of this kernel
> > tree?
> 
> Heh, fair enough. I guess Mel in the end didn't find patches worthy enough
> to be pushed to stable tree. But at least now I know they are well tested
> with 4.4 base so they should do no harm in the stable tree so my stance is
> closer to neutral.
> 

Early on, I backported a number of performance patches to -stable with the
view to having a good baseline to compare a new mainline release with.
However, after a while some of them required unrelated backports that
would be excessive for -stable. While I could have continued backporting
some patches, I stopped as the time required to run all of the performance
tests is excessive and I was already tracking too many kernels.

-- 
Mel Gorman
SUSE Labs