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Wed, 02 Nov 2022 23:03:52 -0700 (PDT) Date: Thu, 3 Nov 2022 15:03:48 +0900 From: Sergey Senozhatsky To: Minchan Kim Cc: Andrew Morton , Nitin Gupta , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Sergey Senozhatsky Subject: Re: [PATCHv4 4/9] zram: Introduce recompress sysfs knob Message-ID: References: <20221018045533.2396670-1-senozhatsky@chromium.org> <20221018045533.2396670-5-senozhatsky@chromium.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1667455434; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=vcRPdTV+WHrAGCtQC2DiKk2qf+ALI9TLfQTYJZ4jJzU=; b=O9yDxzioK2YikbbLWvmjx+PS6S5uHJBy6ICTqHliN8+Tg30gRLpf2sVCv3PeplcQNZqYzr 7dTEqC9mnB/R1i2UJfbO19qIzKtZmkcNuB+0xTyEJ3b6mzv0Lkk6OsBf3+1la0bY64FeZp HrQwN+N5Gs8Lz0HY/LNNLUws/XVv3SE= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=nHMjJVtM; dmarc=pass (policy=none) header.from=chromium.org; spf=pass (imf17.hostedemail.com: domain of senozhatsky@chromium.org designates 209.85.214.174 as permitted sender) smtp.mailfrom=senozhatsky@chromium.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1667455434; a=rsa-sha256; cv=none; b=UjVG2MTBlaAAfUN0pMMnoCSFhDxOpe2PbSgGXLaN8spTzRMwmFRbfIMcSnzJu9+/0ExEgq zDiGhX8MgXiQwHcfNLGRX9++9wWHRJXp/pexuFxjpjkV9ZcdONChhIgH2JWeLrm+z0m3Ig j5OrYlUWA5hZzGbM2Qs4UUEBc0R5ciM= Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=chromium.org header.s=google header.b=nHMjJVtM; dmarc=pass (policy=none) header.from=chromium.org; spf=pass (imf17.hostedemail.com: domain of senozhatsky@chromium.org designates 209.85.214.174 as permitted sender) smtp.mailfrom=senozhatsky@chromium.org X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 23F8C40002 X-Stat-Signature: 19fufb3jwy6ib7uwfmemgojij6pd5cug X-HE-Tag: 1667455433-972317 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On (22/11/03 12:25), Sergey Senozhatsky wrote: > > or we can introduce the threshold with action item. > > > > echo "idle 888" > /sys/block/zram0/recompress > > echo "huge 888" > /sys/block/zram0/recompress > > echo "normal 888" > /sys/block/zram0/recompress > > I like the latter one, when threshold is an optional argument. > I probably would even go a bit further and add keywords: > > type=STRING threshold=INT E.g. recompress support for type= and optional threshold= We kind of don't have a use case of type=normal, as it is an equivalent of no type. So we have huge, idle, huge_idle and no param means all pages (which is sort of logical). threshold is optional. --- drivers/block/zram/zram_drv.c | 55 ++++++++++++++++++++++------------- 1 file changed, 34 insertions(+), 21 deletions(-) diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 9a614253de07..12f03745baf9 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1688,7 +1688,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, * Corresponding ZRAM slot should be locked. */ static int zram_recompress(struct zram *zram, u32 index, struct page *page, - int size_watermark) + int size_threshold) { unsigned long handle_prev; unsigned long handle_next; @@ -1708,7 +1708,7 @@ static int zram_recompress(struct zram *zram, u32 index, struct page *page, /* * Do not recompress objects that are already "small enough". */ - if (comp_len_prev < size_watermark) + if (comp_len_prev < size_threshold) return 0; ret = zram_read_from_zspool(zram, page, index); @@ -1780,29 +1780,42 @@ 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; unsigned long index; struct page *page; ssize_t ret; - int mode, size_watermark = 0; - - if (sysfs_streq(buf, "idle")) { - mode = RECOMPRESS_IDLE; - } else if (sysfs_streq(buf, "huge")) { - mode = RECOMPRESS_HUGE; - } else if (sysfs_streq(buf, "huge_idle")) { - mode = RECOMPRESS_IDLE | RECOMPRESS_HUGE; - } else { - /* - * We will re-compress only idle objects equal or greater - * in size than watermark. - */ - ret = kstrtoint(buf, 10, &size_watermark); - if (ret) - return ret; - mode = RECOMPRESS_IDLE; + int mode = 0, size_threshold = 0; + + args = skip_spaces(buf); + while (*args) { + args = next_arg(args, ¶m, &val); + + if (!*val) + return -EINVAL; + + if (!strcmp(param, "type")) { + if (!strcmp(val, "idle")) + mode = RECOMPRESS_IDLE; + if (!strcmp(val, "huge")) + mode = RECOMPRESS_HUGE; + if (!strcmp(val, "huge_idle")) + mode = RECOMPRESS_IDLE | RECOMPRESS_HUGE; + continue; + } + + if (!strcmp(param, "threshold")) { + /* + * We will re-compress only idle objects equal or + * greater in size than watermark. + */ + ret = kstrtoint(val, 10, &size_threshold); + if (ret) + return ret; + continue; + } } - if (size_watermark > PAGE_SIZE) + if (size_threshold > PAGE_SIZE) return -EINVAL; down_read(&zram->init_lock); @@ -1841,7 +1854,7 @@ static ssize_t recompress_store(struct device *dev, zram_test_flag(zram, index, ZRAM_RECOMP_SKIP)) goto next; - err = zram_recompress(zram, index, page, size_watermark); + err = zram_recompress(zram, index, page, size_threshold); next: zram_slot_unlock(zram, index); if (err) { -- 2.38.1.273.g43a17bfeac-goog