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Rename BANDWIDTH_INTERVAL to UPDATE_INTERVAL to make things clear. This patche doesn't introduce any behavioral changes. Signed-off-by: Tang Yizhou --- mm/page-writeback.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index fcd4c1439cb9..a848e7f0719d 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -54,9 +54,9 @@ #define DIRTY_POLL_THRESH (128 >> (PAGE_SHIFT - 10)) /* - * Estimate write bandwidth at 200ms intervals. + * Estimate write bandwidth or update dirty limit at 200ms intervals. */ -#define BANDWIDTH_INTERVAL max(HZ/5, 1) +#define UPDATE_INTERVAL max(HZ/5, 1) #define RATELIMIT_CALC_SHIFT 10 @@ -1331,11 +1331,11 @@ static void domain_update_dirty_limit(struct dirty_throttle_control *dtc, /* * check locklessly first to optimize away locking for the most time */ - if (time_before(now, dom->dirty_limit_tstamp + BANDWIDTH_INTERVAL)) + if (time_before(now, dom->dirty_limit_tstamp + UPDATE_INTERVAL)) return; spin_lock(&dom->lock); - if (time_after_eq(now, dom->dirty_limit_tstamp + BANDWIDTH_INTERVAL)) { + if (time_after_eq(now, dom->dirty_limit_tstamp + UPDATE_INTERVAL)) { update_dirty_limit(dtc); dom->dirty_limit_tstamp = now; } @@ -1928,7 +1928,7 @@ static int balance_dirty_pages(struct bdi_writeback *wb, wb->dirty_exceeded = gdtc->dirty_exceeded || (mdtc && mdtc->dirty_exceeded); if (time_is_before_jiffies(READ_ONCE(wb->bw_time_stamp) + - BANDWIDTH_INTERVAL)) + UPDATE_INTERVAL)) __wb_update_bandwidth(gdtc, mdtc, true); /* throttle according to the chosen dtc */ @@ -2705,7 +2705,7 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc) * writeback bandwidth is updated once in a while. */ if (time_is_before_jiffies(READ_ONCE(wb->bw_time_stamp) + - BANDWIDTH_INTERVAL)) + UPDATE_INTERVAL)) wb_update_bandwidth(wb); return ret; } @@ -3057,14 +3057,14 @@ static void wb_inode_writeback_end(struct bdi_writeback *wb) atomic_dec(&wb->writeback_inodes); /* * Make sure estimate of writeback throughput gets updated after - * writeback completed. We delay the update by BANDWIDTH_INTERVAL + * writeback completed. We delay the update by UPDATE_INTERVAL * (which is the interval other bandwidth updates use for batching) so * that if multiple inodes end writeback at a similar time, they get * batched into one bandwidth update. */ spin_lock_irqsave(&wb->work_lock, flags); if (test_bit(WB_registered, &wb->state)) - queue_delayed_work(bdi_wq, &wb->bw_dwork, BANDWIDTH_INTERVAL); + queue_delayed_work(bdi_wq, &wb->bw_dwork, UPDATE_INTERVAL); spin_unlock_irqrestore(&wb->work_lock, flags); } From patchwork Wed Oct 2 13:00:03 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tang Yizhou X-Patchwork-Id: 13819733 Received: from mail-pl1-f172.google.com (mail-pl1-f172.google.com [209.85.214.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A71A81D048B for ; Wed, 2 Oct 2024 12:24:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Wed, 02 Oct 2024 05:24:19 -0700 (PDT) Received: from localhost.localdomain ([143.92.64.18]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20b37e33852sm83508625ad.199.2024.10.02.05.24.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Oct 2024 05:24:19 -0700 (PDT) From: Tang Yizhou X-Google-Original-From: Tang Yizhou To: willy@infradead.org, akpm@linux-foundation.org, chandan.babu@oracle.com Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, Tang Yizhou Subject: [PATCH 2/3] mm/page-writeback.c: Fix comment of wb_domain_writeout_add() Date: Wed, 2 Oct 2024 21:00:03 +0800 Message-Id: <20241002130004.69010-3-yizhou.tang@shopee.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241002130004.69010-1-yizhou.tang@shopee.com> References: <20241002130004.69010-1-yizhou.tang@shopee.com> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Tang Yizhou __bdi_writeout_inc() has undergone multiple renamings, but the comment within the function body have not been updated accordingly. Update it to reflect the latest wb_domain_writeout_add(). Signed-off-by: Tang Yizhou --- mm/page-writeback.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index a848e7f0719d..4f6efaa060bd 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -586,7 +586,7 @@ static void wb_domain_writeout_add(struct wb_domain *dom, /* First event after period switching was turned off? */ if (unlikely(!dom->period_time)) { /* - * We can race with other __bdi_writeout_inc calls here but + * We can race with other wb_domain_writeout_add calls here but * it does not cause any harm since the resulting time when * timer will fire and what is in writeout_period_time will be * roughly the same. 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Signed-off-by: Tang Yizhou --- fs/xfs/xfs_iomap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 1e11f48814c0..bb4018395b6e 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1097,7 +1097,7 @@ xfs_buffered_write_iomap_begin( end_fsb = imap.br_startoff + imap.br_blockcount; } else { /* - * We cap the maximum length we map here to MAX_WRITEBACK_PAGES + * We cap the maximum length we map here to 1024 * pages to keep the chunks of work done where somewhat * symmetric with the work writeback does. This is a completely * arbitrary number pulled out of thin air.