Thank Andrea for pointing out to me there are ongoing works for KSM and THP integration. Sorry for the noise. CAI Qian ----- caiqian@xxxxxxxxxx wrote: > There were some changes of behaviours with THP and KSM statistics > demonstrated by this program, http://people.redhat.com/qcai/ksm01.c. > > There are 3 programs (A, B ,C) to allocate 128M memory each using KSM. > A has memory content = 'c'. > B has memory content = 'a'. > C has memory content = 'a'. > Then without THP, > pages_shared = 2 > pages_sharing = 98285 > pages_sharing = 98292 > pages_unshared = 0 > pages_volatile = 17 > pages_to_scan = 98304 > sleep_millisecs = 0 > with THP, > pages_shared is 2. > pages_sharing is 18422. > pages_unshared is 0. > pages_volatile is 8. > > Later, > A has memory content = 'c' > B has memory content = 'b' > C has memory content = 'a'. > Then without THP, > pages_shared = 3 > pages_sharing = 98296 > pages_unshared = 0 > pages_volatile = 5 > with THP, > pages_shared = 3 > pages_sharing = 16358 > pages_unshared = 0 > pages_volatile = 23 > > Later, > A has memory content = 'd' > B has memory content = 'd' > C has memory content = 'd' > Then without THP, > pages_shared = 1 > pages_sharing = 98274 > pages_unshared = 0 > pages_volatile = 29 > with THP, > pages_shared = 1 > pages_sharing = 8668 > pages_unshared = 0 > pages_volatile = 35 > > Finally, > A changes one page to 'e' > Then without THP, > pages_shared = 1 > pages_sharing = 98274 > pages_unshared = 1 > pages_volatile = 28 > with THP, > pages_shared = 1 > pages_sharing = 8163 > pages_unshared = 1 > pages_volatile = 27 > > Are those differences for pages_sharing between with and without THP > are expected? > > CAI Qian -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>