Re: [PATCH v2] mm: page_frag: Warn_on when frag_alloc size is bigger than PAGE_SIZE
From: Jakub Kicinski <kuba@kernel.org>
Date: 2022-05-31 15:14:22
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On Tue, 31 May 2022 22:41:12 +0800 Chen Lin wrote:
At 2022-05-31 02:29:18, "Jakub Kicinski" [off-list ref] wrote:quoted
Oh, well, the reuse also needs an update. We can slap a similar condition next to the pfmemalloc check.The sample code above cannot completely solve the current problem. For example, when fragsz is greater than PAGE_FRAG_CACHE_MAX_SIZE(32768), __page_frag_cache_refill will return a memory of only 32768 bytes, so should we continue to expand the PAGE_FRAG_CACHE_MAX_SIZE? Maybe more work needs to be done
Right, but I can think of two drivers off the top of my head which will allocate <=32k frags but none which will allocate more.