From patchwork Wed Jan 3 02:57:58 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: 759934 Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) (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 8EC064A3B; Wed, 3 Jan 2024 02:58:23 +0000 (UTC) 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="ZOic/KjS" Received: by mail-pg1-f175.google.com with SMTP id 41be03b00d2f7-5cdfa676fa3so35930a12.1; Tue, 02 Jan 2024 18:58:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1704250703; x=1704855503; 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=Ro8Y0j0Jt26z5Mz6Dk1T+PNwiPxDyxcm45d9joAfXn8=; b=ZOic/KjSNCc7P18PRT39Lc29QHs4x43NpAsrOCUVt7q6t5OfJskYU+DFIaIL5Yguir EW+nYFoSRIAWI6JrtQ9NtU+H9Py2JOXkKMN/6zyE2QyP9pX+AHhX1PNbhhs5+3cW7lyM VE0UOunB/JlQi/5MAkNwGlM4NK2lRYDid/+sgk0EyzHoPkyGDq5rinKWiGj5PtCz/dQW zQEVggwXYUnoIC2KHoEldrHvWcgwLEdzuiDAvGYyYlZa2kjAuNRY0+6jIyQUPKgoSIHh smmZioJhqYzgmOkJ+fYZ3uTSdq/oSEhNLnjp+HAmFKGowg8CESeVJRqjMEEkWbO3ttDS mtsw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704250703; x=1704855503; 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=Ro8Y0j0Jt26z5Mz6Dk1T+PNwiPxDyxcm45d9joAfXn8=; b=l9czeXcaWuL2tpvXHDixxlxY+f1s9nIiaf1UtowyMaen2qEHjSyqMW6sTJVJn1b66B icG4xDxH4i4MwEj9sbAteDmyn06HRInsUPbcOdmn7T70YyF5/xlXXRGlblXRLnPKcqdj 6aGrtn8P7Cw2HHC7xdR4GjccM7qPmYAB3mYmZQMBCThx4A5s3kiAj2qSrk1npGeBbW14 4581qrJNyNQrx/hE9gyhWH33oEKtRg/fCCY+kY5egV3tNM9hqevrQIvwt6kT+B+cOokG OhKPPPk7ssiIFNGqhetqLn3L8/2xyTwWkcRngQHVfg9QiWUH0UqaO1X/C4fiiNshohjw QH8w== X-Gm-Message-State: AOJu0YxpmnDG26qusKeblCBMfRqvVRTjtUeZjYOfC/HR2sU7S2pO6qtC rF5itL7D1ZG7cu3HmzpUABA= X-Google-Smtp-Source: AGHT+IHg0kL0VkhfiKjZqGlDkvzVw6ytZtdeJvrtTSssilg7C2zxj//va2NtexTtk2eArS6S4PPYUQ== X-Received: by 2002:a05:6a20:2443:b0:196:c543:abaf with SMTP id t3-20020a056a20244300b00196c543abafmr513723pzc.38.1704250702826; Tue, 02 Jan 2024 18:58:22 -0800 (PST) Received: from barry-desktop.hub ([2407:7000:8942:5500:a7d6:f37a:9130:cd96]) by smtp.gmail.com with ESMTPSA id d6-20020a63fd06000000b005cd8ada89e5sm21168572pgh.70.2024.01.02.18.58.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jan 2024 18:58:22 -0800 (PST) From: Barry Song <21cnbao@gmail.com> To: herbert@gondor.apana.org.au, davem@davemloft.net, akpm@linux-foundation.org, chriscli@google.com, chrisl@kernel.org, ddstreet@ieee.org, hannes@cmpxchg.org, linux-mm@kvack.org, nphamcs@gmail.com, sjenning@redhat.com, vitaly.wool@konsulko.com, yosryahmed@google.com, zhouchengming@bytedance.com Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, Barry Song Subject: [PATCH RFC 2/2] mm/zswap: remove the memcpy if acomp is not asynchronous Date: Wed, 3 Jan 2024 15:57:58 +1300 Message-Id: <20240103025759.523120-2-21cnbao@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240103025759.523120-1-21cnbao@gmail.com> References: <20240103025759.523120-1-21cnbao@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, they won't sleep during decompression. we should be able to remove the redundant memcpy for them. Signed-off-by: Barry Song --- mm/zswap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/zswap.c b/mm/zswap.c index ca25b676048e..36898614ebcc 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_async; /* if acomp can sleep */ }; /* @@ -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_async = acomp_is_async(acomp); req = acomp_request_alloc(acomp_ctx->acomp); if (!req) { @@ -1370,7 +1372,7 @@ 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_async && !zpool_can_sleep_mapped(zpool)) { memcpy(acomp_ctx->buffer, src, entry->length); src = acomp_ctx->buffer; zpool_unmap_handle(zpool, entry->handle); @@ -1384,7 +1386,7 @@ 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_async || zpool_can_sleep_mapped(zpool)) zpool_unmap_handle(zpool, entry->handle); }