Re: [PATCH] mm/memory-failure: release private data before split THP

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On 2022/8/4 10:51, Yin Fengwei wrote:
> If there is private data attached to THP, the refcount of
> THP will be increased and block the THP split. Which could
> further cause the meomry failure not recovered.
> 
> Release private data attached to THP before split it to
> increase the chance of splitting THP successfully.
> 
> The issue was hit during HW error injection testing with
> 5.18 kernel + xfs as rootfs, test got killed and system
> reboot was required to re-run the test.
> 
> The issue was tracked down to THP split failure caused the
> memory failure not being handled. The page dump showed:
> 
> [ 1785.433075] page:0000000025f9530b refcount:18 mapcount:0 mapping:000000008162eea7 index:0xa10 pfn:0x2f0200
> [ 1785.443954] head:0000000025f9530b order:4 compound_mapcount:0 compound_pincount:0
> [ 1785.452408] memcg:ff4247f2d28e9000
> [ 1785.456304] aops:xfs_address_space_operations ino:8555182 dentry name:"baseos-filenames.solvx"
> [ 1785.466612] flags: 0x1000000000012036(referenced|uptodate|lru|active|private|head|node=0|zone=2)
> [ 1785.476514] raw: 1000000000012036 ffb9460f8bc07c08 ffb9460f8bc08408 ff4247f22e6299f8
> [ 1785.485268] raw: 0000000000000a10 ff4247f194ade900 00000012ffffffff ff4247f2d28e9000
> 
> It was like the error was injected to a large folio for xfs with
> private data attached.
> 
> With private data released before split THP, the test case
> could be run successfully many times without reboot system.
> 
> Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@xxxxxxxxx>
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@xxxxxxxxx>
> Signed-off-by: Yin Fengwei <fengwei.yin@xxxxxxxxx>
> Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> Reviewed-by: Aaron Lu <aaron.lu@xxxxxxxxx>
> ---

Looks good to me. Thanks.

Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>





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