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| author | Javier González <jg@lightnvm.io> | 2017-06-26 11:57:13 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-06-26 16:24:53 -0600 |
| commit | db7ada33cdcae7fef0a088141b1e4ab8c25fd395 (patch) | |
| tree | 10e098319a92916b999c5b52e532306ec65e9f57 /drivers/lightnvm | |
| parent | caa69fa560025d12c276abd62d58a87b94324708 (diff) | |
| download | linux-db7ada33cdcae7fef0a088141b1e4ab8c25fd395.tar.gz linux-db7ada33cdcae7fef0a088141b1e4ab8c25fd395.tar.bz2 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')
| -rw-r--r-- | drivers/lightnvm/pblk-init.c | 1 | ||||
| -rw-r--r-- | drivers/lightnvm/pblk-read.c | 6 | ||||
| -rw-r--r-- | drivers/lightnvm/pblk-sysfs.c | 3 | ||||
| -rw-r--r-- | drivers/lightnvm/pblk.h | 1 |
4 files changed, 10 insertions, 1 deletions
diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c index aaefbccce30e..2d79336748ee 100644 --- a/drivers/lightnvm/pblk-init.c +++ b/drivers/lightnvm/pblk-init.c @@ -839,6 +839,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk, atomic_long_set(&pblk->sync_writes, 0); atomic_long_set(&pblk->compl_writes, 0); atomic_long_set(&pblk->inflight_reads, 0); + atomic_long_set(&pblk->cache_reads, 0); atomic_long_set(&pblk->sync_reads, 0); atomic_long_set(&pblk->recov_writes, 0); atomic_long_set(&pblk->recov_writes, 0); 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; } diff --git a/drivers/lightnvm/pblk-sysfs.c b/drivers/lightnvm/pblk-sysfs.c index f0af1d1ceeff..3c1a586c09a2 100644 --- a/drivers/lightnvm/pblk-sysfs.c +++ b/drivers/lightnvm/pblk-sysfs.c @@ -294,7 +294,7 @@ static ssize_t pblk_sysfs_lines_info(struct pblk *pblk, char *page) static ssize_t pblk_sysfs_stats_debug(struct pblk *pblk, char *page) { return snprintf(page, PAGE_SIZE, - "%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\n", + "%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\n", atomic_long_read(&pblk->inflight_writes), atomic_long_read(&pblk->inflight_reads), atomic_long_read(&pblk->req_writes), @@ -307,6 +307,7 @@ static ssize_t pblk_sysfs_stats_debug(struct pblk *pblk, char *page) atomic_long_read(&pblk->recov_writes), atomic_long_read(&pblk->recov_gc_writes), atomic_long_read(&pblk->recov_gc_reads), + atomic_long_read(&pblk->cache_reads), atomic_long_read(&pblk->sync_reads)); } #endif diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h index 95b665f23925..77ee42a3f514 100644 --- a/drivers/lightnvm/pblk.h +++ b/drivers/lightnvm/pblk.h @@ -513,6 +513,7 @@ struct pblk { atomic_long_t sync_writes; /* Sectors synced to media */ atomic_long_t compl_writes; /* Sectors completed in write bio */ atomic_long_t inflight_reads; /* Inflight sector read requests */ + atomic_long_t cache_reads; /* Read requests that hit the cache */ atomic_long_t sync_reads; /* Completed sector read requests */ atomic_long_t recov_writes; /* Sectors submitted from recovery */ atomic_long_t recov_gc_writes; /* Sectors submitted from write GC */ |