Re: cma: alloc_contig_range test_pages_isolated .. failed

[Jianguo Wu <wujianguo@huawei.com>]

Hello,

On 2014/3/11 22:02, Ramakrishnan Muthukrishnan wrote:

> Hello linux-mm hackers,
> 
> We have a TI OMAP4 based system running 3.4 kernel. OMAP4 has got 2 M3
> processors which is used for some media tasks.
> 
> During bootup, the M3 firmware is loaded and it used CMA to allocate 3
> regions for DMA, as seen by these logs:
> 
> [    0.000000] cma: dma_declare_contiguous(size a400000, base
> 99000000, limit 00000000)
> [    0.000000] cma: CMA: reserved 168 MiB at 99000000
> [    0.000000] cma: dma_declare_contiguous(size 2000000, base
> 00000000, limit 00000000)
> [    0.000000] cma: CMA: reserved 32 MiB at ad800000
> [    0.000000] cma: dma_contiguous_reserve(limit af800000)
> [    0.000000] cma: dma_contiguous_reserve: reserving 16 MiB for global area
> [    0.000000] cma: dma_declare_contiguous(size 1000000, base
> 00000000, limit af800000)
> [    0.000000] cma: CMA: reserved 16 MiB at ac000000
> [    0.243652] cma: cma_init_reserved_areas()
> [    0.243682] cma: cma_create_area(base 00099000, count a800)
> [    0.253417] cma: cma_create_area: returned ed0ee400
> [...]
> 
> We observed that if we reboot a system without unmounting the file
> systems (like in abrupt power off..etc), after the fresh reboot, the
> file system checks are performed, the firmware load is delayed by ~4
> seconds (compared to the one without fsck) and then we see the
> following in the kernel bootup logs:
> 
> [   26.846313] alloc_contig_range test_pages_isolated(a2e00, a3400) failed
> [   26.853515] alloc_contig_range test_pages_isolated(a2e00, a3500) failed
> [   26.860809] alloc_contig_range test_pages_isolated(a3100, a3700) failed
> [   26.868133] alloc_contig_range test_pages_isolated(a3200, a3800) failed
> [   26.875213] rproc remoteproc0: dma_alloc_coherent failed: 6291456
> [   26.881744] rproc remoteproc0: Failed to process resources: -12
> [   26.902221] omap_hwmod: ipu: failed to hardreset
> [   26.909545] omap_hwmod: ipu: _wait_target_disable failed
> [   26.916748] rproc remoteproc0: rproc_boot() failed -12
> 
> The M3 firmware load fails because of this. I have been looking at the
> git logs to see if this is fixed in the later checkins, since this is
> a bit old kernel. For various non-technical reasons which I have no
> control of, we can't move to a newer kernel. But I could backport any
> fixes done in newer kernel. Also I am totally new to memory management
> in the kernel, so any help in debugging is highly appreciated.
> 
> thanks


There is a possible that pages drain from pcp will be add to movable list, and
get allocated again before test isolated.

free_pcppages_bulk()
{
	//mt can still be MIGRATE_MOVABLE even the pageblock's migratetype is MIGRATE_ISOLATE.
	mt = get_freepage_migratetype(page);
	/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
	__free_one_page(page, zone, 0, mt);
}

we should use mt = get_pageblock_migratetype(page), but Minchan think it's not a good idea to call
get_pageblock_migratetype in hotpath.

http://marc.info/?l=linux-kernel&m=134555114706070&w=2

Thanks.


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