From: Peter Hurley <peter@hurleysoftware.com>
To: Laura Abbott <lauraa@codeaurora.org>, Hui Zhu <zhuhui@xiaomi.com>,
m.szyprowski@samsung.com, akpm@linux-foundation.org,
riel@redhat.com, mgorman@suse.de, hughd@google.com,
akinobu.mita@gmail.com
Cc: rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz,
mina86@mina86.com, aneesh.kumar@linux.vnet.ibm.com,
iamjoonsoo.kim@lge.com, hannes@cmpxchg.org, minchan@kernel.org,
nasa4836@gmail.com, ddstreet@ieee.org, mingo@kernel.org,
rientjes@google.com, peterz@infradead.org, keescook@chromium.org,
atomlin@redhat.com, raistlin@linux.it, axboe@fb.com,
paulmck@linux.vnet.ibm.com, kirill.shutemov@linux.intel.com,
n-horiguchi@ah.jp.nec.com, k.khlebnikov@samsung.com,
msalter@redhat.com, deller@gmx.de, tangchen@cn.fujitsu.com,
ben@decadent.org.uk, vbabka@suse.cz, sasha.levin@oracle.com,
vdavydov@parallels.com, suleiman@google.com,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH 0/4] (CMA_AGGRESSIVE) Make CMA memory be more aggressive about allocation
Date: Wed, 22 Oct 2014 08:01:54 -0400 [thread overview]
Message-ID: <54479CB2.5040408@hurleysoftware.com> (raw)
In-Reply-To: <543F8812.2020002@codeaurora.org>
On 10/16/2014 04:55 AM, Laura Abbott wrote:
> On 10/15/2014 8:35 PM, Hui Zhu wrote:
>> In fallbacks of page_alloc.c, MIGRATE_CMA is the fallback of
>> MIGRATE_MOVABLE.
>> MIGRATE_MOVABLE will use MIGRATE_CMA when it doesn't have a page in
>> order that Linux kernel want.
>>
>> If a system that has a lot of user space program is running, for
>> instance, an Android board, most of memory is in MIGRATE_MOVABLE and
>> allocated. Before function __rmqueue_fallback get memory from
>> MIGRATE_CMA, the oom_killer will kill a task to release memory when
>> kernel want get MIGRATE_UNMOVABLE memory because fallbacks of
>> MIGRATE_UNMOVABLE are MIGRATE_RECLAIMABLE and MIGRATE_MOVABLE.
>> This status is odd. The MIGRATE_CMA has a lot free memory but Linux
>> kernel kill some tasks to release memory.
>>
>> This patch series adds a new function CMA_AGGRESSIVE to make CMA memory
>> be more aggressive about allocation.
>> If function CMA_AGGRESSIVE is available, when Linux kernel call function
>> __rmqueue try to get pages from MIGRATE_MOVABLE and conditions allow,
>> MIGRATE_CMA will be allocated as MIGRATE_MOVABLE first. If MIGRATE_CMA
>> doesn't have enough pages for allocation, go back to allocate memory from
>> MIGRATE_MOVABLE.
>> Then the memory of MIGRATE_MOVABLE can be kept for MIGRATE_UNMOVABLE and
>> MIGRATE_RECLAIMABLE which doesn't have fallback MIGRATE_CMA.
>>
>
> It's good to see another proposal to fix CMA utilization. Do you have
> any data about the success rate of CMA contiguous allocation after
> this patch series? I played around with a similar approach of using
> CMA for MIGRATE_MOVABLE allocations and found that although utilization
> did increase, contiguous allocations failed at a higher rate and were
> much slower. I see what this series is trying to do with avoiding
> allocation from CMA pages when a contiguous allocation is progress.
> My concern is that there would still be problems with contiguous
> allocation after all the MIGRATE_MOVABLE fallback has happened.
What impact does this series have on x86 platforms now that CMA is the
backup allocator for all iommu dma allocations?
Regards,
Peter Hurley
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next prev parent reply other threads:[~2014-10-22 12:01 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-16 3:35 [PATCH 0/4] (CMA_AGGRESSIVE) Make CMA memory be more aggressive about allocation Hui Zhu
2014-10-16 3:35 ` [PATCH 1/4] (CMA_AGGRESSIVE) Add CMA_AGGRESSIVE to Kconfig Hui Zhu
2014-10-18 22:15 ` Pavel Machek
[not found] ` <201410220126.s9M1Qita026502@spam.xiaomi.com>
2014-10-22 5:44 ` 朱辉
2014-10-16 3:35 ` [PATCH 2/4] (CMA_AGGRESSIVE) Add argument hibernation to function shrink_all_memory Hui Zhu
2014-10-16 8:45 ` Rafael J. Wysocki
2014-10-17 6:18 ` 朱辉
2014-10-17 9:28 ` [PATCH v2 2/4] (CMA_AGGRESSIVE) Add new function shrink_all_memory_for_cma Hui Zhu
2014-10-18 4:50 ` PINTU KUMAR
2014-10-16 3:35 ` [PATCH 3/4] (CMA_AGGRESSIVE) Update reserve custom contiguous area code Hui Zhu
2014-10-17 9:30 ` [PATCH v2 " Hui Zhu
2014-10-16 3:35 ` [PATCH 4/4] (CMA_AGGRESSIVE) Update page alloc function Hui Zhu
2014-10-24 5:28 ` Joonsoo Kim
2014-11-28 3:45 ` Hui Zhu
2014-10-16 5:13 ` [PATCH 0/4] (CMA_AGGRESSIVE) Make CMA memory be more aggressive about allocation Weijie Yang
2014-10-16 8:55 ` Laura Abbott
2014-10-17 7:44 ` 朱辉
2014-10-22 12:01 ` Peter Hurley [this message]
2014-10-23 0:40 ` 朱辉
2014-10-29 14:43 ` Vlastimil Babka
2014-11-03 8:46 ` Hui Zhu
2014-11-04 7:53 ` Minchan Kim
2014-11-04 8:59 ` Hui Zhu
2014-11-04 9:29 ` Vlastimil Babka
2014-11-07 7:06 ` Minchan Kim
2014-10-24 5:25 ` Joonsoo Kim
2014-11-03 7:28 ` Hui Zhu
2014-11-03 8:05 ` Joonsoo Kim
2014-11-04 2:31 ` Joonsoo Kim
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