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?
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