The patch titled
Subject: mm: backing-dev: use group allocation/free of per-cpu counters API
has been added to the -mm mm-unstable branch. Its filename is
mm-backing-dev-use-group-allocation-free-of-per-cpu-counters-api.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-backing-dev-use-group-allocation-free-of-per-cpu-counters-api.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: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: mm: backing-dev: use group allocation/free of per-cpu counters API
Date: Mon, 25 Mar 2024 11:56:35 +0800
Use group allocation/free of per-cpu counters api to accelerate
wb_init/exit() and simplify code.
Link: https://lkml.kernel.org/r/20240325035635.49342-1-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Dennis Zhou <dennis@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/backing-dev.c | 23 +++++------------------
1 file changed, 5 insertions(+), 18 deletions(-)
--- a/mm/backing-dev.c~mm-backing-dev-use-group-allocation-free-of-per-cpu-counters-api
+++ a/mm/backing-dev.c
@@ -388,7 +388,7 @@ static void wb_update_bandwidth_workfn(s
static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
gfp_t gfp)
{
- int i, err;
+ int err;
memset(wb, 0, sizeof(*wb));
@@ -416,18 +416,10 @@ static int wb_init(struct bdi_writeback
if (err)
return err;
- for (i = 0; i < NR_WB_STAT_ITEMS; i++) {
- err = percpu_counter_init(&wb->stat[i], 0, gfp);
- if (err)
- goto out_destroy_stat;
- }
-
- return 0;
+ err = percpu_counter_init_many(wb->stat, 0, gfp, NR_WB_STAT_ITEMS);
+ if (err)
+ fprop_local_destroy_percpu(&wb->completions);
-out_destroy_stat:
- while (i--)
- percpu_counter_destroy(&wb->stat[i]);
- fprop_local_destroy_percpu(&wb->completions);
return err;
}
@@ -460,13 +452,8 @@ static void wb_shutdown(struct bdi_write
static void wb_exit(struct bdi_writeback *wb)
{
- int i;
-
WARN_ON(delayed_work_pending(&wb->dwork));
-
- for (i = 0; i < NR_WB_STAT_ITEMS; i++)
- percpu_counter_destroy(&wb->stat[i]);
-
+ percpu_counter_destroy_many(wb->stat, NR_WB_STAT_ITEMS);
fprop_local_destroy_percpu(&wb->completions);
}
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-backing-dev-use-group-allocation-free-of-per-cpu-counters-api.patch
