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imf26.hostedemail.com; dkim=pass header.d=163.com header.s=s110527 header.b=ZId1PKDH; dmarc=pass (policy=none) header.from=163.com; spf=pass (imf26.hostedemail.com: domain of sh_def@163.com designates 220.197.31.4 as permitted sender) smtp.mailfrom=sh_def@163.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1786216457; b=0GqC8UTQHP1JPdFfaF8rWul5LV3ZNCsCsxYd6M+ttLxuHkyAQO8HN0Rx5uc45X4nHXaWeB S+AN1lCV5fP9kOEKKGQ7+i/gMEPAv4uVDSJgKE+CtCHpZs7UddJSDZ/acY5kEYe7m2+Rsa 338JJBDLnoqxbgoy+yngxs7M0QUIWEo= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=q/ Nn9N+TcF5PSILtONXCcDZuOZOA8yQM5ZlkYu6kinQ=; b=ZId1PKDHgexHLjjuoQ o9I5FEqqw/GttmS2S7MbHCGhYiGa32jLpGOHhRRhG6s3Lfu73NuEUPuVN18ls65J e6rCu8xpwlGnzqJ44F/lMcLCrQWB8ucdlgVPVOn5Vtd4aoHgeg+1wFUtgsepVkLC CrlKv/a2ZPZBlM9fRy4LSQD3s= Received: from localhost (unknown []) by gzsmtp3 (Coremail) with SMTP id PigvCgAXJfzaf3dqWP05MA--.26752S2; Sun, 09 Aug 2026 03:13:31 +0800 (CST) From: Hui Su To: ryabinin.a.a@gmail.com, akpm@linux-foundation.org, kasan-dev@googlegroups.com, linux-mm@kvack.org Cc: glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, linux-kernel@vger.kernel.org, Hui Su Subject: [PATCH] kasan: avoid unnecessary quarantine lock cycling Date: Sun, 9 Aug 2026 03:12:31 +0800 Message-ID: <20260808191230.3345930-2-sh_def@163.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:PigvCgAXJfzaf3dqWP05MA--.26752S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7ZrWDXw47uw45ZrW5try8uFg_yoW8XryDpF 9xJFy3Gw18Z348Xr4UZF15Wr1fXa93Ka4DA3y8Gws3AF15W3W2gryFyF9Fvr4jvr4SvFn0 v3W5J340kr1jyw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0piH5l8UUUUU= X-Originating-IP: [183.192.100.171] X-CM-SenderInfo: xvkbvvri6rljoofrz/xtbC6RuO7Wp3f9tdFwAA3i X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: 58f63f17nfjpj3xw4pu7etp8a97ytuhq X-Rspamd-Queue-Id: D9F9A140004 X-HE-Tag: 1786216455-879780 X-HE-Meta: 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 IyFADneU 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: kasan_quarantine_remove_cache() drops quarantine_lock and restores interrupts after scanning each non-empty quarantine batch so that cond_resched() can schedule during a long scan. When no reschedule is pending, the unlock/IRQ restore and subsequent IRQ save/relock cycle is unnecessary. Check need_resched() before cycling quarantine_lock to avoid this overhead when rescheduling is not needed. Suggested-by: Andrew Morton Signed-off-by: Hui Su --- mm/kasan/quarantine.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c index 6958aa713c67..db7170f6f1b2 100644 --- a/mm/kasan/quarantine.c +++ b/mm/kasan/quarantine.c @@ -368,10 +368,12 @@ void kasan_quarantine_remove_cache(struct kmem_cache *cache) if (qlist_empty(&global_quarantine[i])) continue; qlist_move_cache(&global_quarantine[i], &to_free, cache); - /* Scanning whole quarantine can take a while. */ - raw_spin_unlock_irqrestore(&quarantine_lock, flags); - cond_resched(); - raw_spin_lock_irqsave(&quarantine_lock, flags); + if (need_resched()) { + /* Scanning whole quarantine can take a while. */ + raw_spin_unlock_irqrestore(&quarantine_lock, flags); + cond_resched(); + raw_spin_lock_irqsave(&quarantine_lock, flags); + } } raw_spin_unlock_irqrestore(&quarantine_lock, flags); -- 2.43.0