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H A D | zdata.c | 0b964600 Sun Mar 21 13:32:27 CDT 2021 Gao Xiang <hsiangkao@redhat.com> erofs: complete a missing case for inplace I/O
Add a missing case which could cause unnecessary page allocation but not directly use inplace I/O instead, which increases runtime extra memory footprint.
The detail is, considering an online file-backed page, the right half of the page is chosen to be cached (e.g. the end page of a readahead request) and some of its data doesn't exist in managed cache, so the pcluster will be definitely kept in the submission chain. (IOWs, it cannot be decompressed without I/O, e.g., due to the bypass queue).
Currently, DELAYEDALLOC/TRYALLOC cases can be downgraded as NOINPLACE, and stop online pages from inplace I/O. After this patch, unneeded page allocations won't be observed in pickup_page_for_submission() then.
Link: https://lore.kernel.org/r/20210321183227.5182-1-hsiangkao@aol.com Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
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