Re: [PATCH] mm: use memalloc_nofs_save() in page_cache_ra_order()

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On 2024/4/27 11:45, Matthew Wilcox wrote:
On Fri, Apr 26, 2024 at 11:49:05AM -0700, Andrew Morton wrote:
On Fri, 26 Apr 2024 19:29:38 +0800 Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> wrote:
   io_schedule+0x24/0xa0
   __folio_lock+0x130/0x300
   migrate_pages_batch+0x378/0x918
   migrate_pages+0x350/0x700
   compact_zone+0x63c/0xb38
   compact_zone_order+0xc0/0x118
   try_to_compact_pages+0xb0/0x280
   __alloc_pages_direct_compact+0x98/0x248
   __alloc_pages+0x510/0x1110
   alloc_pages+0x9c/0x130
   folio_alloc+0x20/0x78
   filemap_alloc_folio+0x8c/0x1b0
   page_cache_ra_order+0x174/0x308
   ondemand_readahead+0x1c8/0x2b8

I'm thinking

Fixes: 793917d997df ("mm/readahead: Add large folio readahead")
Cc: stable

I think it goes back earlier than that.
https://lore.kernel.org/linux-mm/20200128060304.GA6615@xxxxxxxxxxxxxxxxxxxxxx/
details how it can happen with the old readpages code.  It's just easier
to hit now.


The page_cache_ra_order() is introduced from 793917d997df, but previous
bugfix f2c817bed58d ("mm: use memalloc_nofs_save in readahead path")
don't Cc stable, so the previous patch should be posted to stable?




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