From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Linux Memory Management List <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Hang with v4.15-rc trying to swap back in
Date: Wed, 27 Dec 2017 15:34:49 -0800 [thread overview]
Message-ID: <1514417689.3083.1.camel@HansenPartnership.com> (raw)
In-Reply-To: <20171227232650.GA9702@bbox>
On Thu, 2017-12-28 at 08:26 +0900, Minchan Kim wrote:
> Hello James,
>
> On Wed, Dec 27, 2017 at 12:50:17PM -0800, James Bottomley wrote:
> >
> > Reverting these three patches fixes the problem:
> >
> > commit aa8d22a11da933dbf880b4933b58931f4aefe91c
> > Author: Minchan Kim <minchan@kernel.org>
> > Date:A A A Wed Nov 15 17:33:11 2017 -0800
> >
> > A A A A mm: swap: SWP_SYNCHRONOUS_IO: skip swapcache only if swapped
> > page
> > has no other reference
> >
> > commit 0bcac06f27d7528591c27ac2b093ccd71c5d0168
> > Author: Minchan Kim <minchan@kernel.org>
> > Date:A A A Wed Nov 15 17:33:07 2017 -0800
> >
> > A A A A mm, swap: skip swapcache for swapin of synchronous device
> >
> > Also need to revert:
> >
> > commit e9a6effa500526e2a19d5ad042cb758b55b1ef93
> > Author: Huang Ying <huang.ying.caritas@gmail.com>
> > Date:A A A Wed Nov 15 17:33:15 2017 -0800
> >
> > A A A A mm, swap: fix false error message in __swp_swapcount()
> >
> > (The latter is simply because it used a function that is eliminated
> > by
> > one of the other reversions). A They came into the merge window via
> > the
> > -mm tree as part of a 4 part series:
> >
> > Subject: [PATCH v2 0/4] skip swapcache for super fast device
> > Message-Id: <1505886205-9671-1-git-send-email-minchan@kernel
> > .org
> > >
> > >
> >
> > James
>
> Thanks for the report.
> Patches are related to synchronous swap devices like brd, zram,
> nvdimm so
>
> 1. What swap device do you use among them?
I've reproduced on nvme and sata spinning rust.
> 2. Could you tell me how you can reproduce it?
The way to reproduce is to force something to swap and then get it to
try to touch the page again. A I do this on my systems by using a large
virtual machine, as I said in the email. A There isn't really any
definitive reproduction method beyond that.
James
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next prev parent reply other threads:[~2017-12-27 23:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1514398340.3986.10.camel@HansenPartnership.com>
2017-12-27 20:50 ` James Bottomley
2017-12-27 23:26 ` Minchan Kim
2017-12-27 23:34 ` James Bottomley [this message]
2017-12-27 23:56 ` Minchan Kim
2017-12-28 17:41 ` James Bottomley
2017-12-28 19:00 ` James Bottomley
2017-12-29 0:00 ` Minchan Kim
2017-12-29 0:45 ` Minchan Kim
2018-01-17 22:33 ` Hugh Dickins
2018-01-17 22:58 ` Andrew Morton
2018-01-17 23:15 ` Hugh Dickins
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