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Thu, 10 Sep 2026 17:43:59 +0800 (CST) Received: from kwepemk300003.china.huawei.com (unknown [7.202.195.93]) by mail.maildlp.com (Postfix) with ESMTPS id 8B71B202E6; Thu, 10 Sep 2026 17:54:52 +0800 (CST) Received: from ubuntu (10.50.87.83) by kwepemk300003.china.huawei.com (7.202.195.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Thu, 10 Sep 2026 17:54:52 +0800 From: Kefeng Wang To: Andrew Morton CC: , Chengming Zhou , Johannes Weiner , Kairui Song , Nhat Pham , Yosry Ahmed , Kefeng Wang Subject: [PATCH v2 3/4] mm: zswap: avoid unnecessary xarray lookup in zswap_store() Date: Thu, 10 Sep 2026 17:54:48 +0800 Message-ID: <20260910095449.715183-4-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260910095449.715183-1-wangkefeng.wang@huawei.com> References: <20260910095449.715183-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.50.87.83] X-ClientProxiedBy: kwepems500001.china.huawei.com (7.221.188.70) To kwepemk300003.china.huawei.com (7.202.195.93) X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: E7BCB1C0002 X-Stat-Signature: tqr3sskn3prpee3xr34dpb59jmgfjjds X-Rspam-User: X-HE-Tag: 1789034095-674307 X-HE-Meta: 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 K2vxxPtZ lRh7uOMK/Va15Isf2rnihjOdKq8i9aYmXM1JpjHCSPVFpbUiit+m35sIMJ0kcAOLzo4vHzurh/t3kOYkOlBEwkIklwb1m1cePQR9nuDhC3tsgbZ2/rSkykfMUEwP+syQSYtb96B0uRNYsBBcT+Mk66sbkbaRqBsp/reXSXCT5Qs3QdreOVNIGbA155WgxJdZVtOQK6Oy72mLB+8CWv8Zlm1NXR3TrFQscsewpXb1rzIWM9KTk81YZWyLypGvsRQlqos+ipun182Lh4i7OJG3H62su4c2HlFb6BrfhT2j2jYj8tlxIOiINzPpJHU1lN2izz/ZR9V6FyVaSIwSS/RS3RHpfLrEosdo9eKxL6/fTb0va9SCsGPjbzMVOp9RipUG4DfhqzP0H/8wt5m++MAFA37YTRoYc/4D8WIIpIb3oiRPLq0s= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: zswap_store() falls through to check_old and walks the swap xarray even when zswap is disabled. Add a zswap_never_enabled() early return matching zswap_load() to avoid unnecessary xarray lookup. Reviewed-by: Johannes Weiner Signed-off-by: Kefeng Wang --- mm/zswap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/zswap.c b/mm/zswap.c index 2c06e4e0e130..6197aa71e33c 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -1492,6 +1492,9 @@ bool zswap_store(struct folio *folio) VM_WARN_ON_ONCE(!folio_test_locked(folio)); VM_WARN_ON_ONCE(!folio_test_swapcache(folio)); + if (zswap_never_enabled()) + return false; + if (!zswap_enabled) goto check_old; -- 2.55.0