On Wed, Sep 30, 2015 at 5:37 PM, Vlastimil Babka <vba...@suse.cz> 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
