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lightnvm: pblk: fix min size for page mempool

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pblk uses an internal page mempool for allocating pages on internal
bios. The main two users of this memory pool are partial reads (reads
with some sectors in cache and some on media) and padded writes, which
need to add dummy pages to an existing bio already containing valid
data (and with a large enough bioset allocated). In both cases, the
maximum number of pages per bio is defined by the maximum number of
physical sectors supported by the underlying device.

This patch fixes a bad mempool allocation, where the min_nr of elements
on the pool was fixed (to 16), which is lower than the maximum number
of sectors supported by NVMe (as of the time for this patch). Instead,
use the maximum number of allowed sectors reported by the device.

Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Javier González 2017-10-13 14:46:06 +02:00 committed by Jens Axboe
parent da67e68fb9
commit bd43241768
4 changed files with 13 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/lightnvm/pblk-core.c
View File

@ -192,7 +192,7 @@ void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
for (i = off; i < nr_pages + off; i++) {
bv = bio->bi_io_vec[i];
mempool_free(bv.bv_page, pblk->page_pool);
mempool_free(bv.bv_page, pblk->page_bio_pool);
}
}
@ -204,14 +204,14 @@ int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
int i, ret;
for (i = 0; i < nr_pages; i++) {
page = mempool_alloc(pblk->page_pool, flags);
page = mempool_alloc(pblk->page_bio_pool, flags);
if (!page)
goto err;
ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
if (ret != PBLK_EXPOSED_PAGE_SIZE) {
pr_err("pblk: could not add page to bio\n");
mempool_free(page, pblk->page_pool);
mempool_free(page, pblk->page_bio_pool);
goto err;
}
}

15
drivers/lightnvm/pblk-init.c
View File

@ -132,7 +132,6 @@ static int pblk_rwb_init(struct pblk *pblk)
}
/* Minimum pages needed within a lun */
#define PAGE_POOL_SIZE 16
#define ADDR_POOL_SIZE 64
static int pblk_set_ppaf(struct pblk *pblk)
@ -247,14 +246,16 @@ static int pblk_core_init(struct pblk *pblk)
if (pblk_init_global_caches(pblk))
return -ENOMEM;
pblk->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0);
if (!pblk->page_pool)
/* internal bios can be at most the sectors signaled by the device. */
pblk->page_bio_pool = mempool_create_page_pool(nvm_max_phys_sects(dev),
0);
if (!pblk->page_bio_pool)
return -ENOMEM;
pblk->line_ws_pool = mempool_create_slab_pool(PBLK_WS_POOL_SIZE,
pblk_blk_ws_cache);
if (!pblk->line_ws_pool)
goto free_page_pool;
goto free_page_bio_pool;
pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache);
if (!pblk->rec_pool)
@ -309,8 +310,8 @@ free_rec_pool:
mempool_destroy(pblk->rec_pool);
free_blk_ws_pool:
mempool_destroy(pblk->line_ws_pool);
free_page_pool:
mempool_destroy(pblk->page_pool);
free_page_bio_pool:
mempool_destroy(pblk->page_bio_pool);
return -ENOMEM;
}
@ -322,7 +323,7 @@ static void pblk_core_free(struct pblk *pblk)
if (pblk->bb_wq)
destroy_workqueue(pblk->bb_wq);
mempool_destroy(pblk->page_pool);
mempool_destroy(pblk->page_bio_pool);
mempool_destroy(pblk->line_ws_pool);
mempool_destroy(pblk->rec_pool);
mempool_destroy(pblk->g_rq_pool);

2
drivers/lightnvm/pblk-read.c
View File

@ -238,7 +238,7 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd,
kunmap_atomic(src_p);
kunmap_atomic(dst_p);
mempool_free(src_bv.bv_page, pblk->page_pool);
mempool_free(src_bv.bv_page, pblk->page_bio_pool);
hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1);
} while (hole < nr_secs);

2
drivers/lightnvm/pblk.h
View File

@ -620,7 +620,7 @@ struct pblk {
struct list_head compl_list;
mempool_t *page_pool;
mempool_t *page_bio_pool;
mempool_t *line_ws_pool;
mempool_t *rec_pool;
mempool_t *g_rq_pool;