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[BLOCK] Don't pin lots of memory in mempools

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Currently we scale the mempool sizes depending on memory installed
in the machine, except for the bio pool itself which sits at a fixed
256 entry pre-allocation.

There's really no point in "optimizing" this OOM path, we just need
enough preallocated to make progress. A single unit is enough, lets
scale it down to 2 just to be on the safe side.

This patch saves ~150kb of pinned kernel memory on a 32-bit box.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-04-02 10:06:42 +02:00 • committed by Jens Axboe
parent b9099ff63c
commit 5972511b77
6 changed files with 11 additions and 40 deletions
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include/linux/bio.h
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@ -276,7 +276,7 @@ extern struct bio_pair *bio_split(struct bio *bi, mempool_t *pool,
extern mempool_t *bio_split_pool;
extern void bio_pair_release(struct bio_pair *dbio);
extern struct bio_set *bioset_create(int, int, int);
extern struct bio_set *bioset_create(int, int);
extern void bioset_free(struct bio_set *);
extern struct bio *bio_alloc(gfp_t, int);