+ writeback-factor-out-domain_over_bg_thresh-to-remove-repeated-code.patch added to mm-unstable branch

+ writeback-factor-out-domain_over_bg_thresh-to-remove-repeated-code.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: writeback: factor out domain_over_bg_thresh to remove repeated code
has been added to the -mm mm-unstable branch.  Its filename is
     writeback-factor-out-domain_over_bg_thresh-to-remove-repeated-code.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/writeback-factor-out-domain_over_bg_thresh-to-remove-repeated-code.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Kemeng Shi <shikemeng@huaweicloud.com>
Subject: writeback: factor out domain_over_bg_thresh to remove repeated code
Date: Tue, 14 May 2024 20:52:49 +0800

Factor out domain_over_bg_thresh from wb_over_bg_thresh to remove repeated
code.

Link: https://lkml.kernel.org/r/20240514125254.142203-4-shikemeng@huaweicloud.com
Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page-writeback.c |   41 +++++++++++++++++++----------------------
 1 file changed, 19 insertions(+), 22 deletions(-)

--- a/mm/page-writeback.c~writeback-factor-out-domain_over_bg_thresh-to-remove-repeated-code
+++ a/mm/page-writeback.c
@@ -2116,6 +2116,20 @@ static void wb_bg_dirty_limits(struct di
 		dtc->wb_dirty = wb_stat(wb, WB_RECLAIMABLE);
 }
 
+static bool domain_over_bg_thresh(struct dirty_throttle_control *dtc)
+{
+	domain_dirty_avail(dtc, false);
+	domain_dirty_limits(dtc);
+	if (dtc->dirty > dtc->bg_thresh)
+		return true;
+
+	wb_bg_dirty_limits(dtc);
+	if (dtc->wb_dirty > dtc->wb_bg_thresh)
+		return true;
+
+	return false;
+}
+
 /**
  * wb_over_bg_thresh - does @wb need to be written back?
  * @wb: bdi_writeback of interest
@@ -2127,31 +2141,14 @@ static void wb_bg_dirty_limits(struct di
  */
 bool wb_over_bg_thresh(struct bdi_writeback *wb)
 {
-	struct dirty_throttle_control gdtc_stor = { GDTC_INIT(wb) };
-	struct dirty_throttle_control mdtc_stor = { MDTC_INIT(wb, &gdtc_stor) };
-	struct dirty_throttle_control * const gdtc = &gdtc_stor;
-	struct dirty_throttle_control * const mdtc = mdtc_valid(&mdtc_stor) ?
-						     &mdtc_stor : NULL;
-
-	domain_dirty_avail(gdtc, false);
-	domain_dirty_limits(gdtc);
-	if (gdtc->dirty > gdtc->bg_thresh)
-		return true;
+	struct dirty_throttle_control gdtc = { GDTC_INIT(wb) };
+	struct dirty_throttle_control mdtc = { MDTC_INIT(wb, &gdtc) };
 
-	wb_bg_dirty_limits(gdtc);
-	if (gdtc->wb_dirty > gdtc->wb_bg_thresh)
+	if (domain_over_bg_thresh(&gdtc))
 		return true;
 
-	if (mdtc) {
-		domain_dirty_avail(mdtc, false);
-		domain_dirty_limits(mdtc);	/* ditto, ignore writeback */
-		if (mdtc->dirty > mdtc->bg_thresh)
-			return true;
-
-		wb_bg_dirty_limits(mdtc);
-		if (mdtc->wb_dirty > mdtc->wb_bg_thresh)
-			return true;
-	}
+	if (mdtc_valid(&mdtc))
+		return domain_over_bg_thresh(&mdtc);
 
 	return false;
 }
_

Patches currently in -mm which might be from shikemeng@huaweicloud.com are

writeback-factor-out-wb_bg_dirty_limits-to-remove-repeated-code.patch
writeback-add-general-function-domain_dirty_avail-to-calculate-dirty-and-avail-of-domain.patch
writeback-factor-out-domain_over_bg_thresh-to-remove-repeated-code.patch
writeback-factor-out-code-of-freerun-to-remove-repeated-code.patch
writeback-factor-out-wb_dirty_freerun-to-remove-more-repeated-freerun-code.patch
writeback-factor-out-balance_domain_limits-to-remove-repeated-code.patch
writeback-factor-out-wb_dirty_exceeded-to-remove-repeated-code.patch
writeback-factor-out-balance_wb_limits-to-remove-repeated-code.patch