From: Nikanth Karthikesan <knikanth@suse.de>
To: Richard Guenther <rguenther@suse.de>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Michael Matz <matz@novell.com>, Matt Mackall <mpm@selenic.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] After swapout/swapin private dirty mappings are reported clean in smaps
Date: Sun, 19 Sep 2010 23:07:09 +0530 [thread overview]
Message-ID: <201009192307.09309.knikanth@suse.de> (raw)
In-Reply-To: <alpine.LNX.2.00.1009151612450.28912@zhemvz.fhfr.qr>
On Wednesday 15 September 2010 19:44:17 Richard Guenther wrote:
> On Wed, 15 Sep 2010, Balbir Singh wrote:
> > * Nikanth Karthikesan <knikanth@suse.de> [2010-09-15 12:01:11]:
> > > How? Current smaps information without this patch provides incorrect
> > > information. Just because a private dirty page became part of swap
> > > cache, it shown as clean and backed by a file. If it is shown as clean
> > > and backed by swap then it is fine.
> >
> > How is GDB using this information?
>
> GDB counts the number of dirty and swapped pages in a private mapping and
> based on that decides whether it needs to dump it to a core file or not.
> If there are no dirty or swapped pages gdb assumes it can reconstruct
> the mapping from the original backing file. This way for example
> shared libraries do not end up in the core file.
>
Well, may be /proc/pid/pagemap + /proc/kpageflags is enough for this! One can
get the pageflags using these interfaces. See Documentation/vm/pagemap.txt for
the explanation on how to do it. There is also a sample program that prints
page flags using this interface in Documentation/vm/page-types.c.
It is bad that /proc/pid/pagemap is never mentioned in
Documentation/filesystems/proc.txt. I will send a patch to rectify this.
Thanks
Nikanth
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next prev parent reply other threads:[~2010-09-20 3:33 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-14 11:10 [PATCH] After swapout/swapin private dirty mappings become clean Nikanth Karthikesan
2010-09-14 11:33 ` Richard Guenther
2010-09-14 17:12 ` Nikanth Karthikesan
2010-09-14 17:14 ` [PATCH v2] After swapout/swapin private dirty mappings are reported clean in smaps Nikanth Karthikesan
2010-09-15 0:26 ` KOSAKI Motohiro
2010-09-15 4:38 ` Nikanth Karthikesan
2010-09-15 4:48 ` KOSAKI Motohiro
2010-09-15 5:04 ` Nikanth Karthikesan
2010-09-15 5:20 ` KOSAKI Motohiro
2010-09-15 6:31 ` Nikanth Karthikesan
2010-09-15 14:09 ` Balbir Singh
2010-09-15 14:14 ` Richard Guenther
2010-09-15 14:46 ` Matt Mackall
2010-09-15 14:53 ` Richard Guenther
2010-09-15 17:24 ` Matt Mackall
2010-09-15 19:08 ` Richard Guenther
2010-09-15 19:18 ` Hugh Dickins
2010-09-15 19:46 ` Matt Mackall
2010-09-15 19:53 ` Richard Guenther
2010-09-15 21:47 ` Hugh Dickins
2010-09-16 3:26 ` [PATCH] Export amount of anonymous memory in a mapping via smaps Nikanth Karthikesan
2010-09-16 3:52 ` KOSAKI Motohiro
2010-09-16 6:04 ` [PATCH] Document the new Anonymous field in smaps Nikanth Karthikesan
2010-09-16 6:34 ` [PATCH] smaps: fix dirty pages accounting KOSAKI Motohiro
2010-09-16 16:56 ` Hugh Dickins
2010-09-16 16:50 ` [PATCH] Document the new Anonymous field in smaps Hugh Dickins
2010-09-17 6:04 ` [PATCH v2] " Nikanth Karthikesan
2010-09-20 7:11 ` Hugh Dickins
2010-09-20 19:24 ` Matt Mackall
2010-09-16 16:40 ` [PATCH] Export amount of anonymous memory in a mapping via smaps Hugh Dickins
2010-09-15 17:41 ` [PATCH v2] After swapout/swapin private dirty mappings are reported clean in smaps Balbir Singh
2010-09-19 17:37 ` Nikanth Karthikesan [this message]
2010-09-19 17:38 ` [PATCH] Document /proc/pid/pagemap in Documentation/filesystems/proc.txt Nikanth Karthikesan
2010-09-20 21:27 ` Matt Mackall
2010-09-20 5:24 ` [PATCH v2] After swapout/swapin private dirty mappings are reported clean in smaps Nikanth Karthikesan
2010-09-20 14:30 ` Richard Guenther
2010-09-15 0:24 ` [PATCH] After swapout/swapin private dirty mappings become clean KOSAKI Motohiro
2010-09-15 4:37 ` Nikanth Karthikesan
2010-09-15 4:46 ` KOSAKI Motohiro
2010-09-15 5:00 ` Nikanth Karthikesan
2010-09-15 5:15 ` KOSAKI Motohiro
2010-09-15 6:29 ` Nikanth Karthikesan
2010-09-15 8:40 ` Richard Guenther
2010-09-16 1:29 ` KOSAKI Motohiro
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