From patchwork Mon Feb 26 09:49:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Pankaj Raghav (Samsung)" X-Patchwork-Id: 13571750 Received: from mout-p-202.mailbox.org (mout-p-202.mailbox.org [80.241.56.172]) (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 0BB6467E79; Mon, 26 Feb 2024 09:50:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708941017; cv=none; b=dAYx5EDivjHCU3dC53xXENCu+wBO+y/fyUDzhey/Z1PsiYIuOViQD+juyFJ0OsJU2ChGZ87hRLlcIatvHFCNMWzxZFBIpDYCysWPW7kFifeG6FiSj2K19+VbNPu5jj5LeQh64lKhF5b3DKIEVRZ8ZJlyWZ1v3BdIRJNh+99zzZI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708941017; c=relaxed/simple; bh=4ejCWPI5/fRYMUcY9eJYWQ4JohLb3zMfCtxtjMK5oW8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ixrAQKVwMXSRNNwXha3A48lmQ3UjpoIoZspHguMfKNmntxesNkoDeBfLT5U/39A5XP4eFC6/2D0t0FtZ9BM7Rw97Tr5+vvDX9AQROnw+yzMyEHomnRfWoTVcj/wuHud2c9LRfMwvxYbR8ctSKEIUsy97KEZ83j4dGxWewQbm1bA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pankajraghav.com; spf=pass smtp.mailfrom=pankajraghav.com; dkim=pass (2048-bit key) header.d=pankajraghav.com header.i=@pankajraghav.com header.b=s1FvJLOV; arc=none smtp.client-ip=80.241.56.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pankajraghav.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pankajraghav.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=pankajraghav.com header.i=@pankajraghav.com header.b="s1FvJLOV" Received: from smtp2.mailbox.org (smtp2.mailbox.org [10.196.197.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-202.mailbox.org (Postfix) with ESMTPS id 4TjwpD4yqgz9sQ6; Mon, 26 Feb 2024 10:50:12 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pankajraghav.com; s=MBO0001; t=1708941012; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=i9yxkr7ZYzLuGR2ramAYSlLdnRgu3ddqhwDDXgb/dQg=; b=s1FvJLOV6O9BDoEZy9rfAWAdOmTdsY69l/3r70AQ4MWdtRAAjRw8jrLMD2N1T8oH7bb3FE Zo5P5AF31/WRErUzGHULK/N/M18PaNHpCSVQ/5UjkSyvUBhL6ARcSVNtDNa7LFFihtGyuX zwLRbtKGFial2tfZRA/t6m9w4WUIikd/uSVFERTvKPvVNwLbAywF7r57ufmFDElaWknTj8 dQx12H3rSonr9IpI4qrobmgSjtp6J/VscSXIGgYelBUaxhicKdv9lyM5eovuOQEre1YR3i LWU2h+G8ukjtVd6mKiPDMISh406FjzorZrXGDipZ54XIyY/I6PB1osHX3sl0NA== From: "Pankaj Raghav (Samsung)" To: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, david@fromorbit.com, chandan.babu@oracle.com, akpm@linux-foundation.org, mcgrof@kernel.org, ziy@nvidia.com, hare@suse.de, djwong@kernel.org, gost.dev@samsung.com, linux-mm@kvack.org, willy@infradead.org, Pankaj Raghav Subject: [PATCH 07/13] readahead: rework loop in page_cache_ra_unbounded() Date: Mon, 26 Feb 2024 10:49:30 +0100 Message-ID: <20240226094936.2677493-8-kernel@pankajraghav.com> In-Reply-To: <20240226094936.2677493-1-kernel@pankajraghav.com> References: <20240226094936.2677493-1-kernel@pankajraghav.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Hannes Reinecke Rework the loop in page_cache_ra_unbounded() to advance with the number of pages in a folio instead of just one page at a time. Signed-off-by: Hannes Reinecke Co-developed-by: Pankaj Raghav Signed-off-by: Pankaj Raghav Acked-by: Darrick J. Wong --- mm/readahead.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/mm/readahead.c b/mm/readahead.c index 325a25e4ee3a..ef0004147952 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -212,7 +212,7 @@ void page_cache_ra_unbounded(struct readahead_control *ractl, struct address_space *mapping = ractl->mapping; unsigned long index = readahead_index(ractl); gfp_t gfp_mask = readahead_gfp_mask(mapping); - unsigned long i; + unsigned long i = 0; /* * Partway through the readahead operation, we will have added @@ -230,7 +230,7 @@ void page_cache_ra_unbounded(struct readahead_control *ractl, /* * Preallocate as many pages as we will need. */ - for (i = 0; i < nr_to_read; i++) { + while (i < nr_to_read) { struct folio *folio = xa_load(&mapping->i_pages, index + i); if (folio && !xa_is_value(folio)) { @@ -243,8 +243,8 @@ void page_cache_ra_unbounded(struct readahead_control *ractl, * not worth getting one just for that. */ read_pages(ractl); - ractl->_index++; - i = ractl->_index + ractl->_nr_pages - index - 1; + ractl->_index += folio_nr_pages(folio); + i = ractl->_index + ractl->_nr_pages - index; continue; } @@ -256,13 +256,14 @@ void page_cache_ra_unbounded(struct readahead_control *ractl, folio_put(folio); read_pages(ractl); ractl->_index++; - i = ractl->_index + ractl->_nr_pages - index - 1; + i = ractl->_index + ractl->_nr_pages - index; continue; } if (i == nr_to_read - lookahead_size) folio_set_readahead(folio); ractl->_workingset |= folio_test_workingset(folio); - ractl->_nr_pages++; + ractl->_nr_pages += folio_nr_pages(folio); + i += folio_nr_pages(folio); } /*