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SubjectRe: [RFC PATCH 2/3] CMA: aggressively allocate the pages on cma reserved memory when not used
Date
Joonsoo Kim <iamjoonsoo.kim@lge.com> writes:

> On Wed, May 14, 2014 at 02:12:19PM +0530, Aneesh Kumar K.V wrote:
>> Joonsoo Kim <iamjoonsoo.kim@lge.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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