Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752187AbdFZJ7p (ORCPT ); Mon, 26 Jun 2017 05:59:45 -0400 Received: from mail-wm0-f53.google.com ([74.125.82.53]:35658 "EHLO mail-wm0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751491AbdFZJ6P (ORCPT ); Mon, 26 Jun 2017 05:58:15 -0400 From: "=?UTF-8?q?Javier=20Gonz=C3=A1lez?=" X-Google-Original-From: =?UTF-8?q?Javier=20Gonz=C3=A1lez?= To: mb@lightnvm.io, axboe@fb.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Javier=20Gonz=C3=A1lez?= , =?UTF-8?q?Matias=20Bj=C3=B8rling?= Subject: [PATCH 04/20] lightnvm: pblk: add debug stat for read cache hits Date: Mon, 26 Jun 2017 11:57:13 +0200 Message-Id: <1498471049-25505-5-git-send-email-javier@cnexlabs.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1498471049-25505-1-git-send-email-javier@cnexlabs.com> References: <1498471049-25505-1-git-send-email-javier@cnexlabs.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3381 Lines: 82 Add a new debug counter to measure cache hits on the read path Signed-off-by: Javier González Signed-off-by: Matias Bjørling --- drivers/lightnvm/pblk-init.c | 1 + drivers/lightnvm/pblk-read.c | 6 ++++++ drivers/lightnvm/pblk-sysfs.c | 3 ++- drivers/lightnvm/pblk.h | 1 + 4 files changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c index ae8cd6d5af8b..3ec3deff709f 100644 --- a/drivers/lightnvm/pblk-init.c +++ b/drivers/lightnvm/pblk-init.c @@ -838,6 +838,7 @@ 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 762c0b73cb67..91307297e444 100644 --- a/drivers/lightnvm/pblk-read.c +++ b/drivers/lightnvm/pblk-read.c @@ -76,6 +76,9 @@ static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd, } 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 @@ static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, 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 99f3186b5288..70b65d308dea 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 */ -- 2.7.4