From: Greg KH <[email protected]> 3.0-stable review patch. If anyone has any objections, please let me know.
------------------ From: Konstantin Khlebnikov <[email protected]> commit c909e99364c8b6ca07864d752950b6b4ecf6bef4 upstream. Stable note: Not tracked in Bugzilla. There were reports of shared mapped pages being unfairly reclaimed in comparison to older kernels. This is being addressed over time. Logic added in commit 8cab4754d24a0 ("vmscan: make mapped executable pages the first class citizen") was noticeably weakened in commit 645747462435d84 ("vmscan: detect mapped file pages used only once"). Currently these pages can become "first class citizens" only after second usage. After this patch page_check_references() will activate they after first usage, and executable code gets yet better chance to stay in memory. Signed-off-by: Konstantin Khlebnikov <[email protected]> Cc: Pekka Enberg <[email protected]> Cc: Minchan Kim <[email protected]> Cc: KAMEZAWA Hiroyuki <[email protected]> Cc: Wu Fengguang <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Nick Piggin <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Shaohua Li <[email protected]> Cc: Rik van Riel <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Mel Gorman <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- mm/vmscan.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -726,6 +726,12 @@ static enum page_references page_check_r if (referenced_page || referenced_ptes > 1) return PAGEREF_ACTIVATE; + /* + * Activate file-backed executable pages after first usage. + */ + if (vm_flags & VM_EXEC) + return PAGEREF_ACTIVATE; + return PAGEREF_KEEP; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
