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raid5-cache: free meta_page earlier 

Once the I/O completed we don't need the meta page anymore.  As the iounits
can live on for a long time this reduces memory pressure a bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Shaohua Li <shli@fb.com>
Signed-off-by: NeilBrown <neilb@suse.com>
This commit is contained in:
Christoph Hellwig 2015-12-21 10:51:01 +11:00 committed by NeilBrown
parent 3848c0bcb0
commit ad66d445ee
1 changed files with 2 additions and 7 deletions
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9
drivers/md/raid5-cache.c
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@ -150,12 +150,6 @@ static bool r5l_has_free_space(struct r5l_log *log, sector_t size)
return log->device_size > used_size + size;
}
static void r5l_free_io_unit(struct r5l_log *log, struct r5l_io_unit *io)
{
__free_page(io->meta_page);
kmem_cache_free(log->io_kc, io);
}
static void __r5l_set_io_unit_state(struct r5l_io_unit *io,
enum r5l_io_unit_state state)
{
@ -215,6 +209,7 @@ static void r5l_log_endio(struct bio *bio)
md_error(log->rdev->mddev, log->rdev);
bio_put(bio);
__free_page(io->meta_page);
spin_lock_irqsave(&log->io_list_lock, flags);
__r5l_set_io_unit_state(io, IO_UNIT_IO_END);
@ -552,7 +547,7 @@ static bool r5l_complete_finished_ios(struct r5l_log *log)
log->next_cp_seq = io->seq;
list_del(&io->log_sibling);
r5l_free_io_unit(log, io);
kmem_cache_free(log->io_kc, io);
found = true;
}