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([2601:1c1:8700:f5b:fe34:97ff:fea3:c147]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-845a40f55cesm2658387b3a.44.2026.06.24.08.55.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jun 2026 08:55:13 -0700 (PDT) From: Hiroshi Nishida To: Song Liu , Yu Kuai Cc: Li Nan , Xiao Ni , linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, Hiroshi Nishida Subject: [PATCH 7/8] md/raid5: raise MAX_STRIPE_BATCH from 8 to 32 Date: Wed, 24 Jun 2026 08:54:51 -0700 Message-ID: <20260624155452.211646-8-nishidafmly@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260624155452.211646-1-nishidafmly@gmail.com> References: <20260624155452.211646-1-nishidafmly@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit handle_active_stripes() dequeues up to MAX_STRIPE_BATCH stripes under device_lock per pass, then processes them after dropping the lock. Raising the batch from 8 to 32 amortizes each device_lock acquisition over more stripes, reducing lock cycles per unit of stripe work. The worker-spawn heuristic in raid5_wakeup_stripe_thread() also divided by MAX_STRIPE_BATCH; split it into a separate STRIPE_BATCH_WORKERS=8 so the spawn sensitivity is preserved unchanged while the batch size grows. Assisted-by: Claude:claude-opus-4-8 [Claude Code] Signed-off-by: Hiroshi Nishida --- drivers/md/raid5.c | 2 +- drivers/md/raid5.h | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index c8787ab7b309..ad6230415af3 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -210,7 +210,7 @@ static void raid5_wakeup_stripe_thread(struct stripe_head *sh) /* at least one worker should run to avoid race */ queue_work_on(sh->cpu, raid5_wq, &group->workers[0].work); - thread_cnt = group->stripes_cnt / MAX_STRIPE_BATCH - 1; + thread_cnt = group->stripes_cnt / STRIPE_BATCH_WORKERS - 1; /* wakeup more workers */ for (i = 1; i < conf->worker_cnt_per_group && thread_cnt > 0; i++) { if (group->workers[i].working == false) { diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h index 7aeba1fc7f09..1f37dabd727b 100644 --- a/drivers/md/raid5.h +++ b/drivers/md/raid5.h @@ -496,7 +496,8 @@ struct disk_info { #define BYPASS_THRESHOLD 1 #define NR_HASH (PAGE_SIZE / sizeof(struct hlist_head)) #define HASH_MASK (NR_HASH - 1) -#define MAX_STRIPE_BATCH 8 +#define MAX_STRIPE_BATCH 32 /* stripes per handle_active_stripes pass */ +#define STRIPE_BATCH_WORKERS 8 /* stripes-per-worker threshold for spawning */ #define RAID5_SYNC_WINDOW 32 /* stripes to pre-submit per sync_request call */ /* NR_STRIPE_HASH_LOCKS must be a power of two, since -- 2.43.0