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| author | Javier González | 2017-06-26 11:57:13 +0200 |
|---|---|---|
| committer | Jens Axboe | 2017-06-27 00:24:53 +0200 |
| commit | db7ada33cdcae7fef0a088141b1e4ab8c25fd395 (patch) | |
| tree | 10e098319a92916b999c5b52e532306ec65e9f57 /drivers/lightnvm/pblk-read.c | |
| parent | lightnvm: pblk: spare double cpu_to_le64 calc. (diff) | |
| download | kernel-qcow2-linux-db7ada33cdcae7fef0a088141b1e4ab8c25fd395.tar.gz kernel-qcow2-linux-db7ada33cdcae7fef0a088141b1e4ab8c25fd395.tar.xz kernel-qcow2-linux-db7ada33cdcae7fef0a088141b1e4ab8c25fd395.zip | |
lightnvm: pblk: add debug stat for read cache hits
Add a new debug counter to measure cache hits on the read path
Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/lightnvm/pblk-read.c')
| -rw-r--r-- | drivers/lightnvm/pblk-read.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c index 74d3fc53022e..f12f40a41558 100644 --- a/drivers/lightnvm/pblk-read.c +++ b/drivers/lightnvm/pblk-read.c @@ -76,6 +76,9 @@ retry: } WARN_ON(test_and_set_bit(i, read_bitmap)); advanced_bio = 1; +#ifdef CONFIG_NVM_DEBUG + atomic_long_inc(&pblk->cache_reads); +#endif } else { /* Read from media non-cached sectors */ rqd->ppa_list[j++] = p; @@ -280,6 +283,9 @@ retry: goto retry; } WARN_ON(test_and_set_bit(0, read_bitmap)); +#ifdef CONFIG_NVM_DEBUG + atomic_long_inc(&pblk->cache_reads); +#endif } else { rqd->ppa_addr = ppa; } |