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

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Date:   Tue, 18 Oct 2016 19:21:49 +0800
From:   Jisheng Zhang <jszhang@...vell.com>
To:     Christoph Hellwig <hch@....de>
CC:     <akpm@...ux-foundation.org>, <joelaf@...gle.com>,
        <chris@...is-wilson.co.uk>, <joaodias@...gle.com>,
        <linux-mm@...ck.org>, <linux-rt-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC] reduce latency in __purge_vmap_area_lazy

On Tue, 18 Oct 2016 08:56:05 +0200 Christoph Hellwig 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.

I just tested this series, the preempt off ftrace log doesn't complain
__purge_vmap_area_lazy any more in my test case, this latency is removed!

So feel free to add

Tested-by: Jisheng Zhang <jszhang@...vell.com>