On Wed, Sep 30, 2015 at 5:37 PM, Vlastimil Babka <vbabka@xxxxxxx> wrote: > On 09/25/2015 11:54 AM, Vitaly Wool wrote: >> >> Hello Minchan, >> >> the main use case where I see unacceptably long stalls in UI with >> zsmalloc is switching between users in Android. >> There is a way to automate user creation and switching between them so >> the test I run both to get vmstat statistics and to profile stalls is >> to create a user, switch to it and switch back. Each test cycle does >> that 10 times, and all the results presented below are averages for 20 >> runs. >> >> Kernel configurations used for testing: >> >> (1): vanilla >> (2): (1) plus "make SLUB atomic" patch [1] >> (3): (1) with zbud instead of zsmalloc >> (4): (2) with compaction defer logic mostly disabled > > > Disabling compaction deferring leads to less compaction stalls? That indeed > looks very weird and counter-intuitive. Also what's "mostly" disabled mean? Not that I'm not surprised myself. However, this is how it goes. Namely, I reverted the following patches: - mm, compaction: defer each zone individually instead of preferred zone - mm, compaction: embed migration mode in compact_control - mm, compaction: add per-zone migration pfn cache for async compaction - mm: compaction: encapsulate defer reset logic ~vitaly -- 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/ . Don't email: <a href