| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 23 Apr 2013 10:26:38 +0900 From: Minchan Kim <minchan@...nel.org> To: Rob Landley <rob@...dley.net> Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Michael Kerrisk <mtk.manpages@...il.com>, Rik van Riel <riel@...hat.com> Subject: Re: [PATCH 6/6] add documentation on proc.txt Hello Rob, On Mon, Apr 22, 2013 at 10:48:39AM -0500, Rob Landley wrote: > On 04/22/2013 03:45:06 AM, Minchan Kim wrote: > >This patch adds documentation about new reclaim field in proc.txt > > > >Cc: Rob Landley <rob@...dley.net> > >Signed-off-by: Minchan Kim <minchan@...nel.org> > >--- > > Documentation/filesystems/proc.txt | 24 ++++++++++++++++++++++++ > > 1 file changed, 24 insertions(+) > > > >diff --git a/Documentation/filesystems/proc.txt > >b/Documentation/filesystems/proc.txt > >index 488c094..c1f5ee4 100644 > >--- a/Documentation/filesystems/proc.txt > >+++ b/Documentation/filesystems/proc.txt > >@@ -136,6 +136,7 @@ Table 1-1: Process specific entries in /proc > > maps Memory maps to executables and library files (2.4) > > mem Memory held by this process > > root Link to the root directory of this process > >+ reclaim Reclaim pages in this process > > stat Process status > > statm Process memory status information > > status Process status in human readable form > >@@ -489,6 +490,29 @@ To clear the soft-dirty bit > > > > Any other value written to /proc/PID/clear_refs will have no effect. > > > >+The /proc/PID/reclaim is used to reclaim pages in this process. > > Trivial nitpick: Either start with "The file" or just /proc/PID/reclaim I prefer "The file". > > >+To reclaim file-backed pages, > >+ > echo 1 > /proc/PID/reclaim > >+ > >+To reclaim anonymous pages, > >+ > echo 2 > /proc/PID/reclaim > >+ > >+To reclaim both pages, > >+ > echo 3 > /proc/PID/reclaim > >+ > >+Also, you can specify address range of process so part of address > >space > >+will be reclaimed. The format is following as > >+ > echo 4 addr size > /proc/PID/reclaim > > Size is in bytes or pages? (I'm guessing bytes. It must be a > multiple of pages?) Hmm, current implementation doesn't force it but it sounds good. I will do it in next spin. addr should be page-aligned but not necessary to be for size. > > So the following examples are telling it to reclaim a specific page? Right. > > >+To reclaim file-backed pages in address range, > >+ > echo 4 $((1<<20) 4096 > /proc/PID/reclaim > >+ > >+To reclaim anonymous pages in address range, > >+ > echo 5 $((1<<20) 4096 > /proc/PID/reclaim > >+ > >+To reclaim both pages in address range, > >+ > echo 6 $((1<<20) 4096 > /proc/PID/reclaim > >+ > > The /proc/pid/pagemap gives the PFN, which can be used to find > >the pageflags > > using /proc/kpageflags and number of times a page is mapped using > > /proc/kpagecount. For detailed explanation, see > >Documentation/vm/pagemap.txt. > > Otherwise, if the series goes in I'm fine with this going in with it. > > Acked-by: Rob Landley <rob@...dley.net> Thanks for the review! > > Rob > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@...ck.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a> -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists