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Date:   Fri, 15 Mar 2019 09:49:26 +0000
From:   Pankaj Suryawanshi <pankaj.suryawanshi@...fochips.com>
To:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "minchan@...nel.org" <minchan@...nel.org>,
        Michal Hocko <mhocko@...nel.org>
Subject: High Latency of CMA allocation

Hello,

I am facing issue of high latency in CMA allocation of large size buffer .

I am frequently allocating/deallocation CMA memory, but latency of allocation is very high.

Below are the stat for allocation/deallocation latency issue.

(389120 kB),  latency 29997 us
(389120 kB),  latency 22957 us
(389120 kB),  latency 25735 us
(389120 kB),  latency 12736 us
(389120 kB),  latency 26009 us
(389120 kB),  latency 18058 us
(389120 kB),  latency 27997 us
(16 kB),  latency 560 us
(256 kB),  latency 280 us
(4 kB), latency 311 us

Is there any workaround or solution for this(cma_alloc latency) issue ?

Regards,
Pankaj
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