linux-kernel - Re: [RFC PATCH 2/3] CMA: aggressively allocate the pages on cma reserved memory when not used

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Date:	Sun, 18 May 2014 23:06:08 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/3] CMA: aggressively allocate the pages on cma reserved memory when not used

Joonsoo Kim <iamjoonsoo.kim@....com> writes:

> On Wed, May 14, 2014 at 02:12:19PM +0530, Aneesh Kumar K.V wrote:
>> Joonsoo Kim <iamjoonsoo.kim@....com> writes:
>> 
>> 
>> 
>> Another issue i am facing with the current code is the atomic allocation
>> failing even with large number of CMA pages around. In my case we never
>> reclaimed because large part of the memory is consumed by the page cache and
>> for that, free memory check doesn't include at free_cma. I will test
>> with this patchset and update here once i have the results.
>> 
>
> Hello,
>
> Could you elaborate more on your issue?
> I can't completely understand your problem.
> So your atomic allocation is movable? And although there are many free
> cma pages, that request is fail?
>

non movable atomic allocations are failing because we don't have
anything other than CMA pages left and kswapd is yet to catchup ?


  swapper/0: page allocation failure: order:0, mode:0x20
  CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.23-1500.pkvm2_1.5.ppc64 #1
  Call Trace:
 [c000000ffffcb610] [c000000000017330] .show_stack+0x130/0x200 (unreliable)
 [c000000ffffcb6e0] [c00000000087a8c8] .dump_stack+0x28/0x3c
 [c000000ffffcb750] [c0000000001e06f0] .warn_alloc_failed+0x110/0x160
 [c000000ffffcb800] [c0000000001e5984] .__alloc_pages_nodemask+0x9d4/0xbf0
 [c000000ffffcb9e0] [c00000000023775c] .alloc_pages_current+0xcc/0x1b0
 [c000000ffffcba80] [c0000000007098d4] .__netdev_alloc_frag+0x1a4/0x1d0
 [c000000ffffcbb20] [c00000000070d750] .__netdev_alloc_skb+0xc0/0x130
 [c000000ffffcbbb0] [d000000009639b40] .tg3_poll_work+0x900/0x1110 [tg3]
 [c000000ffffcbd10] [d00000000963a3a4] .tg3_poll_msix+0x54/0x200 [tg3]
 [c000000ffffcbdb0] [c00000000071fcec] .net_rx_action+0x1dc/0x310
 [c000000ffffcbe90] [c0000000000c1b08] .__do_softirq+0x158/0x330
 [c000000ffffcbf90] [c000000000025744] .call_do_softirq+0x14/0x24
 [c000000ffffc7e00] [c000000000011684] .do_softirq+0xf4/0x130
 [c000000ffffc7e90] [c0000000000c1f18] .irq_exit+0xc8/0x110
 [c000000ffffc7f10] [c000000000011258] .__do_irq+0xc8/0x1f0
 [c000000ffffc7f90] [c000000000025768] .call_do_irq+0x14/0x24
 [c00000000137b750] [c00000000001142c] .do_IRQ+0xac/0x130
 [c00000000137b800] [c000000000002a64]
 hardware_interrupt_common+0x164/0x180

....


 Node 0 DMA: 408*64kB (C) 408*128kB (C) 408*256kB (C) 408*512kB (C) 408*1024kB (C) 406*2048kB (C) 199*4096kB (C) 97*8192kB (C) 6*16384kB (C) =
 3348992kB
 Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=16384kB
 Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=16777216kB

meminfo details:

 MemTotal:       65875584 kB
 MemFree:         8001856 kB
 Buffers:        49330368 kB
 Cached:           178752 kB
 SwapCached:            0 kB
 Active:         28550464 kB
 Inactive:       25476416 kB
 Active(anon):    3771008 kB
 Inactive(anon):   767360 kB
 Active(file):   24779456 kB
 Inactive(file): 24709056 kB
 Unevictable:       15104 kB
 Mlocked:           15104 kB
 SwapTotal:       8384448 kB
 SwapFree:        8384448 kB
 Dirty:                 0 kB

-aneesh

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