io_uring: impose max limit on apoll cache

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Caches like this tend to grow to the peak size, and then never get any
smaller. Impose a max limit on the size, to prevent it from growing too
big.

A somewhat randomly chosen 512 is the max size we'll allow the cache
to get. If a batch of frees come in and would bring it over that, we
simply start kfree'ing the surplus.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2022-07-07 14:20:54 -06:00

parent 9b797a37c4

commit 9731bc9855

3 changed files with 17 additions and 3 deletions

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include/linux/io_uring_types.h

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