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[5.186.122.168]) by smtp.gmail.com with ESMTPSA id s12sm1342784edb.11.2019.03.07.04.18.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 Mar 2019 04:18:56 -0800 (PST) From: =?utf-8?q?Javier_Gonz=C3=A1lez?= To: mb@lightnvm.io Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, =?utf-8?q?Jav?= =?utf-8?q?ier_Gonz=C3=A1lez?= Subject: [PATCH] pblk: fix max_io calculation Date: Thu, 7 Mar 2019 13:18:53 +0100 Message-Id: <20190307121853.14503-1-javier@javigon.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP When calculating the maximun I/O size allowed into the buffer, consider the write size (ws_opt) used by the write thread in order to cover the case in which, due to flushes, the mem and subm pointers are disaligned by (ws_opt - 1). This case currently translates into a stall when an I/O of the largest possible size is submitted. Fixes: f9f9d1ae2c66 ("lightnvm: pblk: prevent stall due to wb threshold") Signed-off-by: Javier González --- Matias: Can you apply this as a fix to 5.1. This is a case I missed when fixing the wb threshold, which is also scheduled for 5.1 Thanks, Javier drivers/lightnvm/pblk-rl.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/lightnvm/pblk-rl.c b/drivers/lightnvm/pblk-rl.c index b014957dde0b..a5f8bc2defbc 100644 --- a/drivers/lightnvm/pblk-rl.c +++ b/drivers/lightnvm/pblk-rl.c @@ -233,10 +233,15 @@ void pblk_rl_init(struct pblk_rl *rl, int budget, int threshold) /* To start with, all buffer is available to user I/O writers */ rl->rb_budget = budget; rl->rb_user_max = budget; - rl->rb_max_io = threshold ? (budget - threshold) : (budget - 1); rl->rb_gc_max = 0; rl->rb_state = PBLK_RL_HIGH; + /* Maximize I/O size and ansure that back threshold is respected */ + if (threshold) + rl->rb_max_io = budget - pblk->min_write_pgs_data - threshold; + else + rl->rb_max_io = budget - pblk->min_write_pgs_data - 1; + atomic_set(&rl->rb_user_cnt, 0); atomic_set(&rl->rb_gc_cnt, 0); atomic_set(&rl->rb_space, -1);