On Sat, 26 Feb 2011 22:56:31 +0800 Nai Xia <nai.xia@xxxxxxxxx> wrote: > ksm_pages_sharing is updated by ksmd periodically. In some cases, it cannot > reflect the actual savings and makes the benchmarks on volatile VMAs very > inaccurate. > > This patch add a vm_stat entry and let the /proc/meminfo show information > about how much virutal address pte is being mapped to ksm pages. With default > ksm paramters (pages_to_scan==100 && sleep_millisecs==20), this can result in > 50% more accurate averaged savings result for the following test program. > Bigger sleep_millisecs values will increase this deviation. So I think you're saying that the existing ksm_pages_sharing sysfs file is no good. You added a new entry to /proc/meminfo and left ksm_pages_sharing as-is. Why not leave /proc/meminfo alone, and fix up the existing ksm_pages_sharing? Also, the patch accumulates the NR_KSM_PAGES_SHARING counts on a per-zone basis as well as on a global basis, but only provides the global count to userspace. The per-zone counts are potentially interesting? If not, maintaining the per-zone counters is wasted overhead. > > --- test.c----- > The "^---" token conventionally means "end of changelog". Please avoid inserting it into the middle of the changelog. > +++ b/mm/ksm.c > @@ -897,6 +897,7 @@ static int try_to_merge_one_page(struct vm_area_struct > *vma, Your email client wordwraps the patches. -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
