On Mon, 8 Aug 2011 15:07:00 +0400 Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> wrote: > 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> How effective does this work on your test ? > --- > 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>