From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Pavel Emelyanov <xemul@parallels.com>,
Andrew Morton <akpm@linux-foundation.org>,
Matt Mackall <mpm@selenic.com>,
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH] mm: Save soft-dirty bits on swapped pages
Date: Wed, 24 Jul 2013 21:17:28 +0400 [thread overview]
Message-ID: <20130724171728.GH8508@moon> (raw)
In-Reply-To: <CALCETrVWgSMrM2ujpO092ZLQa3pWEQM4vdmHhCVUohUUcoR8AQ@mail.gmail.com>
On Wed, Jul 24, 2013 at 10:06:53AM -0700, Andy Lutomirski wrote:
> > Hi Andy, if I understand you correctly "file-backed pages" are carried
> > in pte with _PAGE_FILE bit set and the swap soft-dirty bit won't be
> > used on them but _PAGE_SOFT_DIRTY will be set on write if only I've
> > not missed something obvious (Pavel?).
>
> If I understand this stuff correctly, the vmscan code calls
> try_to_unmap when it reclaims memory, which makes its way into
> try_to_unmap_one, which clears the pte (and loses the soft-dirty bit).
Indeed, I was so stareing into swap that forgot about files. I'll do
a separate patch for that, thanks!
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WARNING: multiple messages have this Message-ID (diff)
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Linux MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Pavel Emelyanov <xemul@parallels.com>,
Andrew Morton <akpm@linux-foundation.org>,
Matt Mackall <mpm@selenic.com>,
Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH] mm: Save soft-dirty bits on swapped pages
Date: Wed, 24 Jul 2013 21:17:28 +0400 [thread overview]
Message-ID: <20130724171728.GH8508@moon> (raw)
In-Reply-To: <CALCETrVWgSMrM2ujpO092ZLQa3pWEQM4vdmHhCVUohUUcoR8AQ@mail.gmail.com>
On Wed, Jul 24, 2013 at 10:06:53AM -0700, Andy Lutomirski wrote:
> > Hi Andy, if I understand you correctly "file-backed pages" are carried
> > in pte with _PAGE_FILE bit set and the swap soft-dirty bit won't be
> > used on them but _PAGE_SOFT_DIRTY will be set on write if only I've
> > not missed something obvious (Pavel?).
>
> If I understand this stuff correctly, the vmscan code calls
> try_to_unmap when it reclaims memory, which makes its way into
> try_to_unmap_one, which clears the pte (and loses the soft-dirty bit).
Indeed, I was so stareing into swap that forgot about files. I'll do
a separate patch for that, thanks!
next prev parent reply other threads:[~2013-07-24 17:17 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-24 16:08 [PATCH] mm: Save soft-dirty bits on swapped pages Cyrill Gorcunov
2013-07-24 16:08 ` Cyrill Gorcunov
2013-07-24 16:23 ` Andy Lutomirski
2013-07-24 16:23 ` Andy Lutomirski
2013-07-24 16:37 ` Cyrill Gorcunov
2013-07-24 16:37 ` Cyrill Gorcunov
2013-07-24 17:06 ` Andy Lutomirski
2013-07-24 17:06 ` Andy Lutomirski
2013-07-24 17:17 ` Cyrill Gorcunov [this message]
2013-07-24 17:17 ` Cyrill Gorcunov
2013-07-24 17:36 ` James Bottomley
2013-07-24 17:36 ` James Bottomley
2013-07-24 17:42 ` Andy Lutomirski
2013-07-24 17:42 ` Andy Lutomirski
2013-07-24 18:15 ` Cyrill Gorcunov
2013-07-24 18:15 ` Cyrill Gorcunov
2013-07-24 18:21 ` Andy Lutomirski
2013-07-24 18:21 ` Andy Lutomirski
2013-07-24 18:52 ` Cyrill Gorcunov
2013-07-24 18:52 ` Cyrill Gorcunov
2013-07-24 18:55 ` Pavel Emelyanov
2013-07-24 18:55 ` Pavel Emelyanov
2013-07-24 19:04 ` Cyrill Gorcunov
2013-07-24 19:04 ` Cyrill Gorcunov
2013-07-24 19:18 ` Cyrill Gorcunov
2013-07-24 19:18 ` Cyrill Gorcunov
2013-07-24 19:40 ` Andy Lutomirski
2013-07-24 19:40 ` Andy Lutomirski
2013-07-25 7:07 ` Cyrill Gorcunov
2013-07-25 7:07 ` Cyrill Gorcunov
2013-07-25 7:29 ` Pavel Emelyanov
2013-07-25 7:29 ` Pavel Emelyanov
2013-07-25 8:26 ` Hush Bensen
2013-07-25 8:26 ` Hush Bensen
2013-07-25 8:43 ` Pavel Emelyanov
2013-07-25 8:43 ` Pavel Emelyanov
2013-07-25 16:02 ` Andy Lutomirski
2013-07-25 16:02 ` Andy Lutomirski
2013-07-24 18:52 ` Pavel Emelyanov
2013-07-24 18:52 ` Pavel Emelyanov
2013-07-24 18:52 ` Pavel Emelyanov
2013-07-24 18:52 ` Pavel Emelyanov
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