Re: [PATCH 0/3] allow zram to use zbud as underlying allocator

From: Vlastimil Babka
Date: Wed Sep 30 2015 - 11:37:54 EST

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

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?

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at