linux-kernel - Re: [RFC] reduce latency in __purge_vmap_area

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Message-ID: <20161018214011.02b0deab@roar.ozlabs.ibm.com>
Date:   Tue, 18 Oct 2016 21:40:11 +1100
From:   Nicholas Piggin <npiggin@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     akpm@...ux-foundation.org, joelaf@...gle.com, jszhang@...vell.com,
        chris@...is-wilson.co.uk, joaodias@...gle.com, linux-mm@...ck.org,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] reduce latency in __purge_vmap_area_lazy

On Tue, 18 Oct 2016 08:56:05 +0200
Christoph Hellwig <hch@....de> wrote:

> Hi all,
> 
> this is my spin at sorting out the long lock hold times in
> __purge_vmap_area_lazy.  It is based on the patch from Joel sent this
> week.  I don't have any good numbers for it, but it survived an
> xfstests run on XFS which is a significant vmalloc user.  The
> changelogs could still be improved as well, but I'd rather get it
> out quickly for feedback and testing.

All seems pretty good to me.

Thanks,
Nick