From patchwork Wed Nov 15 02:42:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergey Senozhatsky X-Patchwork-Id: 13456165 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE81D644 for ; Wed, 15 Nov 2023 02:42:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="awEMNyUf" Received: from mail-pf1-x436.google.com (mail-pf1-x436.google.com [IPv6:2607:f8b0:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C4F59C8 for ; Tue, 14 Nov 2023 18:42:38 -0800 (PST) Received: by mail-pf1-x436.google.com with SMTP id d2e1a72fcca58-6c32a20d5dbso5720927b3a.1 for ; Tue, 14 Nov 2023 18:42:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1700016158; x=1700620958; 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=3VD/qfUA8hK9LrNVNGdNy45/FGzdZaL0XDcCmNsYDKk=; b=awEMNyUf3PS99csUDZtoHr1Oe6PHeW0+VoZEwZg1S6s39G8IyL/1GlP5lQCpYGpw/E TU7OFCcKOEbzuMEWECcKuXEYES9LdGQ1lwZJemSxXc1kQ5W895kWZFB0g8XpuDlF+MNN Ahv849U+JT6/OI+9sTK6TFFh//4NxKnK6oAxY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700016158; x=1700620958; 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=3VD/qfUA8hK9LrNVNGdNy45/FGzdZaL0XDcCmNsYDKk=; b=UHWGK5/DzF+4XCTB4loqul93t3E559j05k1RQ9yxLLT5INQriKFPVnmLcfL5A9ziEv TvLq0koYZkErDTV/ENpRcR97aNa3/3hoeCmUNSCDNWOI6cHo9OzMsIf9HZd+9tJIQrfw zjV3VmqoL9PVTQLie1CYyrPu9E0tKxhf3sBJ2TDJeGQRm3awMPZ/6BKn8S+/BhrjHrec bxc9GYLD3TOcIGTqdIlznn3+v1soOmtu43Y4bUyDPyEcr+J53ohqHHR31lzDWcdQUm05 ZDAzma+a+nAGNS/kEL8+XxXFxvKkcm6JJY/zl+CzqRnJJsEuMRjxMZpQKjLdvSsF6yK+ 4zqA== X-Gm-Message-State: AOJu0YyOe3X0yKa8cVsLcFLbwUVD6E1seL4t/rg2cU1RRgXIE6b/HEGc HZOZsn6UVrKNep9bOXob0MCLqfh8krtzDBvd4fE= X-Google-Smtp-Source: AGHT+IHSV0HQALZRrZs3q5DkDvLmgw0G/p1SXNykrNJdK5dx0Fyf6gr985MkByLq7NofCYDhQdbmCw== X-Received: by 2002:a05:6a00:8c05:b0:6c3:402a:d53d with SMTP id ih5-20020a056a008c0500b006c3402ad53dmr10257300pfb.2.1700016158230; Tue, 14 Nov 2023 18:42:38 -0800 (PST) Received: from tigerii.tok.corp.google.com ([2401:fa00:8f:203:dfe3:bfcd:e155:c392]) by smtp.gmail.com with ESMTPSA id c15-20020a62e80f000000b0068ffd56f705sm1862016pfi.118.2023.11.14.18.42.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Nov 2023 18:42:37 -0800 (PST) From: Sergey Senozhatsky To: Minchan Kim Cc: Andrew Morton , linux-block@vger.kernel.org, Sergey Senozhatsky Subject: [PATCH 2/2] zram: tweak writeback config help Date: Wed, 15 Nov 2023 11:42:13 +0900 Message-ID: <20231115024223.4133148-2-senozhatsky@chromium.org> X-Mailer: git-send-email 2.43.0.rc0.421.g78406f8d94-goog In-Reply-To: <20231115024223.4133148-1-senozhatsky@chromium.org> References: <20231115024223.4133148-1-senozhatsky@chromium.org> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Writeback is for incompressible and idle zram pages. Signed-off-by: Sergey Senozhatsky --- drivers/block/zram/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/zram/Kconfig b/drivers/block/zram/Kconfig index af201392ed52..7b29cce60ab2 100644 --- a/drivers/block/zram/Kconfig +++ b/drivers/block/zram/Kconfig @@ -59,8 +59,8 @@ config ZRAM_WRITEBACK bool "Write back incompressible or idle page to backing device" depends on ZRAM help - With incompressible page, there is no memory saving to keep it - in memory. Instead, write it out to backing device. + This lets zram entries (incompressible or idle pages) be written + back to a backing device, helping save memory. For this feature, admin should set up backing device via /sys/block/zramX/backing_dev.