Logic added in commit v2.6.30-5507-g8cab475 (vmscan: make mapped executable pages the first class citizen) was noticeably weakened in commit v2.6.33-5448-g6457474 (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. TODO: run some cool tests like in v2.6.30-5507-g8cab475 =) Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> --- mm/vmscan.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 3cd766d..29b3612 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -727,6 +727,12 @@ static enum page_references page_check_references(struct page *page, 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, 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>