lkml.org 
[lkml]   [2024]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 02/10] writeback: add general function domain_dirty_avail to calculate dirty and avail of domain
Date
Add general function domain_dirty_avail to calculate dirty and avail for
either dirty limit or background writeback in either global domain or wb
domain.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
---
mm/page-writeback.c | 50 +++++++++++++++++++++++++++++++++------------
1 file changed, 37 insertions(+), 13 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index e1f73643aca1..e4f181d52035 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -837,6 +837,41 @@ static void mdtc_calc_avail(struct dirty_throttle_control *mdtc,
mdtc->avail = filepages + min(headroom, other_clean);
}

+static inline void
+global_domain_dirty_avail(struct dirty_throttle_control *dtc, bool bg)
+{
+ dtc->avail = global_dirtyable_memory();
+ dtc->dirty = global_node_page_state(NR_FILE_DIRTY);
+ if (!bg)
+ dtc->dirty += global_node_page_state(NR_WRITEBACK);
+}
+
+static inline void
+wb_domain_dirty_avail(struct dirty_throttle_control *dtc, bool bg)
+{
+ unsigned long filepages = 0, headroom = 0, writeback = 0;
+
+ mem_cgroup_wb_stats(dtc->wb, &filepages, &headroom, &dtc->dirty,
+ &writeback);
+ if (!bg)
+ dtc->dirty += writeback;
+ mdtc_calc_avail(dtc, filepages, headroom);
+}
+
+/*
+ * Dirty background will ignore pages being written as we're trying to
+ * decide whether to put more under writeback.
+ */
+static void domain_dirty_avail(struct dirty_throttle_control *dtc, bool bg)
+{
+ struct dirty_throttle_control *gdtc = mdtc_gdtc(dtc);
+
+ if (gdtc)
+ wb_domain_dirty_avail(dtc, bg);
+ else
+ global_domain_dirty_avail(dtc, bg);
+}
+
/**
* __wb_calc_thresh - @wb's share of dirty threshold
* @dtc: dirty_throttle_context of interest
@@ -2119,14 +2154,8 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb)
struct dirty_throttle_control * const mdtc = mdtc_valid(&mdtc_stor) ?
&mdtc_stor : NULL;

- /*
- * Similar to balance_dirty_pages() but ignores pages being written
- * as we're trying to decide whether to put more under writeback.
- */
- gdtc->avail = global_dirtyable_memory();
- gdtc->dirty = global_node_page_state(NR_FILE_DIRTY);
+ domain_dirty_avail(gdtc, true);
domain_dirty_limits(gdtc);
-
if (gdtc->dirty > gdtc->bg_thresh)
return true;

@@ -2135,13 +2164,8 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb)
return true;

if (mdtc) {
- unsigned long filepages, headroom, writeback;
-
- mem_cgroup_wb_stats(wb, &filepages, &headroom, &mdtc->dirty,
- &writeback);
- mdtc_calc_avail(mdtc, filepages, headroom);
+ domain_dirty_avail(mdtc, true);
domain_dirty_limits(mdtc); /* ditto, ignore writeback */
-
if (mdtc->dirty > mdtc->bg_thresh)
return true;

--
2.30.0

\
 
 \ /
  Last update: 2024-05-27 18:07    [W:0.566 / U:0.360 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site