From patchwork Wed Jan 3 09:50:05 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: 759740 Received: from mail-pf1-f173.google.com (mail-pf1-f173.google.com [209.85.210.173]) (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 0D61118E0C; Wed, 3 Jan 2024 09:50:40 +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="VTRu68CT" Received: by mail-pf1-f173.google.com with SMTP id d2e1a72fcca58-6d9bec20980so2479131b3a.2; Wed, 03 Jan 2024 01:50:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1704275440; x=1704880240; 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=HF2P2SEmq7vRAtkf5d5h6lFP1PY7Yzig5CUd/10AwIg=; b=VTRu68CTFBoX1r0Mj1eTNq+EXifaN3iJsc1gO40YkQrHijbSbvHDsMwEQiuK2uPR0v eEy2MTuIU7ZJ7VJRIMeOy2tkaQAIJ2PkVEPPzipSzaww4UXcS/6y9Nf1cISOEwDhMiXW XK72tIQ0TkIO6Z8jDkF+xMHUMsYJ7a2+Mvd5jCBhe91OHy9LXQRpL08y7J3rjFxKe9o/ lJhzlVF1suxWh2uhSpFVLISKc/xxWV2BvwZj47DQfpGXmyigc36402nkY4b3SJdzBZKr S3Xm7pgmnWmSVbusBgNQ9USXOgMBbdmIgVGmSan+xCSHhzrjoJ0jrX7oJxGzTi3D5osD MjpA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704275440; x=1704880240; 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=HF2P2SEmq7vRAtkf5d5h6lFP1PY7Yzig5CUd/10AwIg=; b=p2jnxtZdG/aM6y0jSNjjx4HgTzpP3U63bUFfWqemL/n0RCIl2hf5c70BwFlBvYuZGx T5IuLBTNGT0IHUXiKPse6yPxS7iDmMyu3mRvs/JOUK82SicQmUlU1Fv4x5gtATmIeSXQ 1Twgu5bbXh7SdOwYa+kkgE3HDhRSE9tquc00ASaj9c+da1XCQl4hCGTYLbECzBmmzVoH SzNdZlm18AMaGEFNP569KygghG7XgJrp+dEwhdEubeoR77NEZkgMIX1CQDnq/rfO2sWQ FMM0HApetX/TnCH2fIbNJOd0SrXPsuXIkDbCVKRLFBzvJbV96lEBrT8bURKCDVzQDZus /s4A== X-Gm-Message-State: AOJu0Yzbgs2kc9oot2B901oHR0IR+mfvM3gRL6rWm3oYncbJ4AwMvjo1 h4xrpDN92mhIa4/QLwWvOM8= X-Google-Smtp-Source: AGHT+IFhQWnb8yS8UAuFwFy8vb78sg6hucpOXjJ6Kq+ulrOpwt7NgLV10YadMn0i2Bik7OAWQ2a24g== X-Received: by 2002:a05:6a21:a585:b0:197:7997:b69 with SMTP id gd5-20020a056a21a58500b0019779970b69mr296409pzc.69.1704275440398; Wed, 03 Jan 2024 01:50:40 -0800 (PST) Received: from barry-desktop.hub ([2407:7000:8942:5500:a7d6:f37a:9130:cd96]) by smtp.gmail.com with ESMTPSA id a34-20020a631a22000000b005c65e82a0cbsm21823483pga.17.2024.01.03.01.50.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jan 2024 01:50:40 -0800 (PST) From: Barry Song <21cnbao@gmail.com> To: herbert@gondor.apana.org.au, davem@davemloft.net, akpm@linux-foundation.org, ddstreet@ieee.org, sjenning@redhat.com, vitaly.wool@konsulko.com, linux-crypto@vger.kernel.org Cc: chriscli@google.com, chrisl@kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, nphamcs@gmail.com, yosryahmed@google.com, zhouchengming@bytedance.com, Barry Song Subject: [PATCH 2/3] mm/zswap: remove the memcpy if acomp is not asynchronous Date: Wed, 3 Jan 2024 22:50:05 +1300 Message-Id: <20240103095006.608744-3-21cnbao@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240103095006.608744-1-21cnbao@gmail.com> References: <20240103095006.608744-1-21cnbao@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 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); }