From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: [PATCH 09/18] writeback: add dirty_throttle_control->wb_completions Date: Mon, 23 Mar 2015 01:07:38 -0400 Message-ID: <1427087267-16592-10-git-send-email-tj@kernel.org> References: <1427087267-16592-1-git-send-email-tj@kernel.org> Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=V5THAzkpCS0X7JeiQVXksmst6dAKXxZBYlnatbwkTIk=; b=i/o6QAtnlAFK0PGsqCLubVQ+80HSyYTN1W4iK7GJEOmead48UNhgItMdSqRoKGag9X 5WS6b7KIu9EEUFeiGhv270GsCYPJCH810N/EWMZHFz5CyQwcQ6bhyKILy5AG3n3sDQLU 37v3nNdJSLRmlBIxnco1XiW/8zAfjMA6Wa5Tu89c5ljBit+T4QTwEdrpU4uFYuxTLIsU 3kTfhsk9hXG6C9fYQP2fBSIB3FRZJi9u9MGXwK6tK/0KacFBXFUMpPVVKmVZlpe7X4Kz NVsJKjrRM3Rd50Qkczawp49A8kADks4qQZOPFqMZcez9c1by/MuXDZWx5nlc+9Qwffsg iBVw== In-Reply-To: <1427087267-16592-1-git-send-email-tj@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, jack@suse.cz, hch@infradead.org, hannes@cmpxchg.org, linux-fsdevel@vger.kernel.org, vgoyal@redhat.com, lizefan@huawei.com, cgroups@vger.kernel.org, linux-mm@kvack.org, mhocko@suse.cz, clm@fb.com, fengguang.wu@intel.com, david@fromorbit.com, gthelen@google.com, Tejun Heo wb->completions measures the wb's proportional write bandwidth in global_wb_domain and thus naturally tied to the wb_domain. This patch adds dirty_throttle_control->wb_completions which is initialized to wb->completions by GDTC_INIT() and updates __wb_dirty_limits() to use it instead of dereferencing wb->completions directly. This will allow dirty_throttle_control to represent different wb_domains and the matching wb completions. This patch doesn't introduce any behavioral changes. Signed-off-by: Tejun Heo Cc: Jens Axboe Cc: Jan Kara Cc: Wu Fengguang Cc: Greg Thelen --- mm/page-writeback.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index ac2d7b1..1f216cf 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -127,6 +127,7 @@ struct wb_domain global_wb_domain; /* consolidated parameters for balance_dirty_pages() and its subroutines */ struct dirty_throttle_control { struct bdi_writeback *wb; + struct fprop_local_percpu *wb_completions; unsigned long dirty; /* file_dirty + write + nfs */ unsigned long thresh; /* dirty threshold */ @@ -139,7 +140,8 @@ struct dirty_throttle_control { unsigned long pos_ratio; }; -#define GDTC_INIT(__wb) .wb = (__wb) +#define GDTC_INIT(__wb) .wb = (__wb), \ + .wb_completions = &(__wb)->completions /* * Length of period for aging writeout fractions of bdis. This is an @@ -590,7 +592,7 @@ static unsigned long __wb_dirty_limit(struct dirty_throttle_control *dtc) /* * Calculate this BDI's share of the dirty ratio. */ - fprop_fraction_percpu(&dom->completions, &dtc->wb->completions, + fprop_fraction_percpu(&dom->completions, dtc->wb_completions, &numerator, &denominator); wb_dirty = (dirty * (100 - bdi_min_ratio)) / 100; -- 2.1.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org