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@xxxxxxxxxxx> > >Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> > >--- > > 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@xxxxxxxxxxx> Thanks for the review! > > Rob > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> -- Kind regards, Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>