From patchwork Fri Feb 16 04:08:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Barry Song <21cnbao@gmail.com> X-Patchwork-Id: 773985 Received: from mail-pg1-f182.google.com (mail-pg1-f182.google.com [209.85.215.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6F85D17551; Fri, 16 Feb 2024 04:09:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708056546; cv=none; b=YNQE+AFeAXco/pTqfDs2vY+ArbkVMRdk2Uf30dDBEFlFqFe9mvhxd0eccIVOfojnfbOo+0lMiWQHJhSm9fd654YYhZY4pN44Ln0BTPog9QblYb+BeTrlS5G6g0xnTuShU1tHxUZOtqqfi1ruCvBfGTt7bBPTEs2ods2PLsEcGm8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708056546; c=relaxed/simple; bh=PIYvWr5DMLF8+jxHRgFqYx/2Q2KnJ/Jtsvfz7TqNIu4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=t76syD5n0bnF3t8lTBwFtg4PelYeKwdWGzndjXEO8A22HvApEvPaw59dtVso5JiJ769qltZiqUiN3w9h9/s5fXsYWrpcmXW1GEqhg+/4h0hhit/Zi8rpBgFcUSWo5mcLtdVoXfWsHQbf0lU90IDT6rqgsjmrAmlHipS0Ebn1VwM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=mwzcx4fV; arc=none smtp.client-ip=209.85.215.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="mwzcx4fV" Received: by mail-pg1-f182.google.com with SMTP id 41be03b00d2f7-53fbf2c42bfso302340a12.3; Thu, 15 Feb 2024 20:09:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1708056545; x=1708661345; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=uQ9C4C07Lh00QdEMEtLL7F2M/Vil3VvFnVKlElC+iJU=; b=mwzcx4fVqYo6YP3/p+OJBp2EqeOemf24U/B/c3aryo1z0Z5GJEgzEeYzgw/KQtMK5O 7zWALR0cg6mUqmYl7AWMQwd5PgYJM5jagyHmygWN+p1mYcWGs2lUDGIRJzZ8IlPJwe7d YHLPKyndSx5GKGRv0NABZYsk7vLqjvdH2FyPzaR1o9m4gZ+GA5dsTHm24hsXABCrSVNc JJi0MpXAGVnrYCZzbshAn6z/qJG9xp7ZkGmTd/Y8jkCB7PnS3PVzoEE/OAe1SkaeSWZA Y6XnPmGpaUWTZnNpKet9eFzHIWmrIFsZgbfeo5n4AkITX9sKJJme59v+0+O41t+pzqGn T2+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708056545; x=1708661345; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=uQ9C4C07Lh00QdEMEtLL7F2M/Vil3VvFnVKlElC+iJU=; b=rr2o9ZGkeflidRPpw8/LEAdJkzucagkxZDJJvUwtfI4uxNuW0KCt2sz7WvswmQEI+v DNkuR+1S4ik73TC6Jz6Ps3eIk5wYl1ckb/wNItj/MaqDg6pfqMGM+Mz5JUq4Xsic5vTL MGjZBFWxuj67vT9F3u6MN3bQtugdxTD6SJVBvqG9TiJTs/2CVlf1lhRmVLtelYpWbbrh 4umz7Yp6QVm3RSdNp09sWpPreEmn+ZPvVy+GazVJ71Wi/uF+xaJ9hJxurw2734ifaXae ctcXtOiXG58VAkbUq/RSLxyXJ6CWpD3sIBNtV+rlhDz7xSxorUNBVSKocwHH2i4K4NQG hKww== X-Forwarded-Encrypted: i=1; AJvYcCV/LOydAloFbm2JV4la88O8Ei5Ek5gVZ/zBohoOi5sJgpQrGbBqw0pUTXufjdFUYbqWcw4ftBp1boA6WCEOzMoYWbTJTJuYcurgKY51zviZHexKYGvL5ibwo+W8HdlbYTpmX7kTctPghHbb X-Gm-Message-State: AOJu0YyXSC7P09Lvzybj5pcRieJ81/xzB/QSdAKe5f1RmtzEFAKR5Cah hneWZfRNdXqbhlaiizi4qU0s675zE90rlv50Ws/p5kEPwSYAH4vN X-Google-Smtp-Source: AGHT+IGm+c27oE9nV1vTL6DqB17c0WIc/pNE/jU1ctzgiqcPDvRGxQ+m4LGav7LM74bm7qpn24bzHg== X-Received: by 2002:a17:90b:3606:b0:299:3657:4950 with SMTP id ml6-20020a17090b360600b0029936574950mr257715pjb.2.1708056544708; Thu, 15 Feb 2024 20:09:04 -0800 (PST) Received: from barry-desktop.hub ([2407:7000:8942:5500:f28b:3925:777f:45d4]) by smtp.gmail.com with ESMTPSA id pt12-20020a17090b3d0c00b00298ff26e4c8sm2321393pjb.26.2024.02.15.20.08.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Feb 2024 20:09:04 -0800 (PST) From: Barry Song <21cnbao@gmail.com> To: akpm@linux-foundation.org, davem@davemloft.net, hannes@cmpxchg.org, herbert@gondor.apana.org.au, linux-crypto@vger.kernel.org, linux-mm@kvack.org, nphamcs@gmail.com, yosryahmed@google.com, zhouchengming@bytedance.com Cc: chriscli@google.com, chrisl@kernel.org, ddstreet@ieee.org, linux-kernel@vger.kernel.org, sjenning@redhat.com, vitaly.wool@konsulko.com, Barry Song Subject: [PATCH v2 2/3] mm/zswap: remove the memcpy if acomp is not sleepable Date: Fri, 16 Feb 2024 17:08:14 +1300 Message-Id: <20240216040815.114202-3-21cnbao@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240216040815.114202-1-21cnbao@gmail.com> References: <20240216040815.114202-1-21cnbao@gmail.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Barry Song Most compressors are actually CPU-based and won't sleep during compression and decompression. We should remove the redundant memcpy for them. Signed-off-by: Barry Song Tested-by: Chengming Zhou Reviewed-by: Nhat Pham --- mm/zswap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/zswap.c b/mm/zswap.c index 350dd2fc8159..6319d2281020 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -168,6 +168,7 @@ struct crypto_acomp_ctx { struct crypto_wait wait; u8 *buffer; struct mutex mutex; + bool is_sleepable; }; /* @@ -716,6 +717,7 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node) goto acomp_fail; } acomp_ctx->acomp = acomp; + acomp_ctx->is_sleepable = acomp_is_sleepable(acomp); req = acomp_request_alloc(acomp_ctx->acomp); if (!req) { @@ -1368,7 +1370,7 @@ static void __zswap_load(struct zswap_entry *entry, struct page *page) mutex_lock(&acomp_ctx->mutex); src = zpool_map_handle(zpool, entry->handle, ZPOOL_MM_RO); - if (!zpool_can_sleep_mapped(zpool)) { + if (acomp_ctx->is_sleepable && !zpool_can_sleep_mapped(zpool)) { memcpy(acomp_ctx->buffer, src, entry->length); src = acomp_ctx->buffer; zpool_unmap_handle(zpool, entry->handle); @@ -1382,7 +1384,7 @@ static void __zswap_load(struct zswap_entry *entry, struct page *page) BUG_ON(acomp_ctx->req->dlen != PAGE_SIZE); mutex_unlock(&acomp_ctx->mutex); - if (zpool_can_sleep_mapped(zpool)) + if (!acomp_ctx->is_sleepable || zpool_can_sleep_mapped(zpool)) zpool_unmap_handle(zpool, entry->handle); }