From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f175.google.com (mail-pl1-f175.google.com [209.85.214.175]) (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 521572C6AA for ; Fri, 29 Mar 2024 09:07:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.175 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711703240; cv=none; b=MeG2qpvaQKB8U8E2eN48bZJxUE+ygce6SvHVVxtVmaNwPpCvuDCSFifNdCa21cFi9qKsPtwWylJOREQVAn+PTzAz4ralA4dCr2ySXvYlzJANHLRgCSYykzukyj8iANnWU9tU2l6Bli5eBBTqwSbN8Fcfg7eiBfA/4axl1NkTGD0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711703240; c=relaxed/simple; bh=It/GX+ReBBYX1AKiBl4D9EMBAtHpYKikCFSIkseXHaE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bXQgJg9TIiUERe4IQxsQ8XjdoPQdX7Ho6kbQ+zjmdSVeIpVGV0yfE74XZfG14XUbCf16CfxKlL97pl1ynHUfqMYWljgvkdtFwowyhieYnOJb/d18gRNe7UUdGnj3sAjsuo009mQqFHkqTkAkuU1dfROeWJsRMhxfv7UtCECocd8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=WwOJgg9e; arc=none smtp.client-ip=209.85.214.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="WwOJgg9e" Received: by mail-pl1-f175.google.com with SMTP id d9443c01a7336-1e0025ef1efso13531025ad.1 for ; Fri, 29 Mar 2024 02:07:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1711703238; x=1712308038; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=trqMODpsIhhm8jYppx91hSLinbtKoTmnbiwFELvPFk0=; b=WwOJgg9eVte0maMaH7PFWXurb2GL308tKYIJubT42EoWVJHmNMjJux/uj4xd6nm7iT vUosIsu5LXCXdGvtVgm3RF99pTUct/Pk5grFa5FQh7GHk6eYbqd5e/4izC15wDYkTPNn 87BOEbOzvmCZGu4fMCviHZ2LCTxbgol0S0cXA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711703238; x=1712308038; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=trqMODpsIhhm8jYppx91hSLinbtKoTmnbiwFELvPFk0=; b=PioGj5oYYIE4ApQowmVXE4Zd5NKAYlRnQKWkJAfGv5sH6OVbTQuxO7jPjp3RRA6KfV s58rUcFYSEVefsoCDzZQYRpo5TaZm0Ma00XxblVn5RBKyT8HKrvKlVRgjwbS9qV6IiBM Z/N1iHsohW01ezFLWZzQiR//L7O2dtKxwjgVJ4Fv9aLjI+47+2P+ts4c7t5xg/ttu6qr +BLoJa/r1kUdo7d1AbEnRnUOOrodDkgGowd8fDX50Yo7buPDHhnoWF35cggMI4tB2wPA vsj4o8w7KA/x530Tnwe/Cd9e/MTH3rkI2PPcv+tudsLdwFPZNl+OC+2Q4kDH4B9HqlBA DOEQ== X-Forwarded-Encrypted: i=1; AJvYcCXpUYnvsaEh5Zf2sqwM0dwLq9ywvvTR+HHPpRLWt3vrtecdeuLKM8S7DUmaDFXHh6It6t1NAdE3r91HRF0lCTDhxMohAV2YftTAnIcN X-Gm-Message-State: AOJu0Yww2/N1R1Pz7KQDKgJca14EpS7MJlXY6IRBgqn9s0tTj8fD1CPp GcnKDJ+MUI5hpO3vnRNHnwzQrPKkUHIoPgv24TF3di2r43Toi7KXsW5EMgHRGw== X-Google-Smtp-Source: AGHT+IFjV84gXiP/i/Evod+K04pCptnzt8bY2N+jkT5KFPFU1TVRG+7hC1lnO6hvyrpk4aINbKcrXQ== X-Received: by 2002:a17:902:a3ca:b0:1e2:179d:66d1 with SMTP id q10-20020a170902a3ca00b001e2179d66d1mr1760681plb.19.1711703238474; Fri, 29 Mar 2024 02:07:18 -0700 (PDT) Received: from tigerii.tok.corp.google.com ([2401:fa00:8f:203:889e:22ed:efac:44b6]) by smtp.gmail.com with ESMTPSA id m9-20020a170902db0900b001e0fdc6e4e7sm3008108plx.173.2024.03.29.02.07.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Mar 2024 02:07:18 -0700 (PDT) From: Sergey Senozhatsky To: Andrew Morton , Minchan Kim Cc: Brian Geffon , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Sergey Senozhatsky Subject: [PATCH] zram: add limit to recompression Date: Fri, 29 Mar 2024 18:06:44 +0900 Message-ID: <20240329090700.2799449-1-senozhatsky@chromium.org> X-Mailer: git-send-email 2.44.0.478.gd926399ef9-goog Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Introduce "max_pages" param to recompression device attribute which sets the upper limit on the number of entries (pages) zram attempts to recompress. Signed-off-by: Sergey Senozhatsky --- Documentation/admin-guide/blockdev/zram.rst | 5 +++++ drivers/block/zram/zram_drv.c | 18 ++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/Documentation/admin-guide/blockdev/zram.rst b/Documentation/admin-guide/blockdev/zram.rst index ee2b0030d416..091e8bb38887 100644 --- a/Documentation/admin-guide/blockdev/zram.rst +++ b/Documentation/admin-guide/blockdev/zram.rst @@ -466,6 +466,11 @@ of equal or greater size::: #recompress idle pages larger than 2000 bytes echo "type=idle threshold=2000" > /sys/block/zramX/recompress +It is also possible to limit the number of pages zram re-compression will +attempt to recompress::: + + echo "type=huge_idle max_pages=42" > /sys/block/zramX/recompress + Recompression of idle pages requires memory tracking. During re-compression for every page, that matches re-compression criteria, diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index f0639df6cd18..a97986c52476 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1710,6 +1710,7 @@ static ssize_t recompress_store(struct device *dev, struct zram *zram = dev_to_zram(dev); unsigned long nr_pages = zram->disksize >> PAGE_SHIFT; char *args, *param, *val, *algo = NULL; + u64 recomp_limit = ULLONG_MAX; u32 mode = 0, threshold = 0; unsigned long index; struct page *page; @@ -1732,6 +1733,17 @@ static ssize_t recompress_store(struct device *dev, continue; } + if (!strcmp(param, "max_pages")) { + /* + * Limit the number of entries (pages) we attempt to + * recompress. + */ + ret = kstrtoull(val, 10, &recomp_limit); + if (ret) + return ret; + continue; + } + if (!strcmp(param, "threshold")) { /* * We will re-compress only idle objects equal or @@ -1788,6 +1800,9 @@ static ssize_t recompress_store(struct device *dev, for (index = 0; index < nr_pages; index++) { int err = 0; + if (!recomp_limit) + break; + zram_slot_lock(zram, index); if (!zram_allocated(zram, index)) @@ -1816,6 +1831,9 @@ static ssize_t recompress_store(struct device *dev, break; } + if (recomp_limit > 0) + recomp_limit--; + cond_resched(); } -- 2.44.0.478.gd926399ef9-goog