Messages in this thread | | | Date | Mon, 22 Apr 2013 10:48:39 -0500 | From | Rob Landley <> | Subject | Re: [PATCH 6/6] add documentation on proc.txt |
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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@landley.net> > Signed-off-by: Minchan Kim <minchan@kernel.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
> +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?)
So the following examples are telling it to reclaim a specific page?
> +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@landley.net>
Rob
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