From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 452DD20C00C for ; Tue, 2 Dec 2025 01:32:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764639138; cv=none; b=CkW2tXNyov7QYnV19tMwG6gNFnX2EQL5TQ7i79ZPczSMDTIDkiXOZuYn55UZ7IM12WXWcSwSZKzznh9yDgdWEtRXP/kdgsWUs1AZQRjVRIuT/cYk7HyMvsWP2u11nFPyZoODIcsXqWB+gvEvT1pXnOigsUfSuW/Qh7gGXG5mnbU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764639138; c=relaxed/simple; bh=BpU3vRCEK3UYtGGHaZpkgnwj8upX/nDTSQm3S16WZKw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fgdGjoEIJwJ0PGPb1MoaRwPohrhzLLb0CKXIR24L6zqCfzc1cN8483gS6l8jpCeDV5O8IZE7Uxv3nL3mzP+UKpjC8a0M5txXPDTS9oyClwRtsqqyhAoPb81b0JHGlc5c/8Pq31QWKl5p3iMLgrbtomNvhtESeZ1NwEfmcF4CXOo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ITwt/47d; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ITwt/47d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7560C19421; Tue, 2 Dec 2025 01:32:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764639137; bh=BpU3vRCEK3UYtGGHaZpkgnwj8upX/nDTSQm3S16WZKw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ITwt/47d5odXjPpW5XsmIr+DppcqY0pR7w2OmyMxX/v9Vx+G5bblrfvU+3LW1uPv+ W+yq4wTfC97UROaid0R1bZ9j1N80QXn5A+jKF2SlL96b/I4oGr8gCEOcjFfEnBOiHv PCPHEM8/Pf1yit1bd1W48L5cGbhjX9vty78//0ezC86uRWVYhR9mo2fyD4gFVlDmNU ZyU4n2fPng8NyawGr8oc76ZyYOoO07QsBYQjMgL7nb5oUCR8TNrLSTkOrNcY564dH5 qiQuLPh50ysMiu+tjCCv3z2MzK4f5kTtuzYnB8RYzg+yxjUd+wF32DWNLXSDr1vZ17 F0GD94JUSw90Q== From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-mm@kvack.org, Matthew Wilcox Cc: Jaegeuk Kim Subject: [PATCH 2/3] mm/readahead: use page_cache_sync_ra for FADVISE_FAV_WILLNEED Date: Tue, 2 Dec 2025 01:30:12 +0000 Message-ID: <20251202013212.964298-3-jaegeuk@kernel.org> X-Mailer: git-send-email 2.52.0.107.ga0afd4fd5b-goog In-Reply-To: <20251202013212.964298-1-jaegeuk@kernel.org> References: <20251202013212.964298-1-jaegeuk@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch replaces page_cache_ra_unbounded() with page_cache_sync_ra() in fadvise(FADVISE_FAV_WILLNEED) to support the large folio. Before: f2fs_fadvise: dev = (252,16), ino = 14, i_size = 4294967296 offset:0, len:4294967296, advise:3 page_cache_ra_unbounded: dev=252:16 ino=e index=0 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=2048 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=4096 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=6144 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=8192 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=10240 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=12288 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=14336 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=16384 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=18432 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=20480 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=22528 nr_to_read=2048 lookahead_size=0 page_cache_ra_unbounded: dev=252:16 ino=e index=24576 nr_to_read=2048 lookahead_size=0 ... page_cache_ra_unbounded: dev=252:16 ino=e index=1042432 nr_to_read=2048 lookahead_size=0 Note, this is all order-zero page allocation. After: f2fs_fadvise: dev = (252,16), ino = 14, i_size = 4294967296 offset:0, len:536870912, advise:3 page_cache_sync_ra: dev=252:16 ino=e index=0 req_count=2048 order=0 size=0 async_size=0 ra_pages=2048 mmap_miss=0 prev_pos=-1 page_cache_ra_order: dev=252:16 ino=e index=0 order=0 size=2048 async_size=1024 ra_pages=2048 page_cache_sync_ra: dev=252:16 ino=e index=2048 req_count=2048 order=0 size=2048 async_size=1024 ra_pages=2048 mmap_miss=0 prev_pos=-1 page_cache_ra_unbounded: dev=252:16 ino=e index=2048 nr_to_read=2048 lookahead_size=0 page_cache_sync_ra: dev=252:16 ino=e index=4096 req_count=2048 order=0 size=2048 async_size=1024 ra_pages=2048 mmap_miss=0 prev_pos=-1 page_cache_ra_unbounded: dev=252:16 ino=e index=4096 nr_to_read=2048 lookahead_size=0 page_cache_sync_ra: dev=252:16 ino=e index=6144 req_count=2048 order=0 size=2048 async_size=1024 ra_pages=2048 mmap_miss=0 prev_pos=-1 page_cache_ra_unbounded: dev=252:16 ino=e index=6144 nr_to_read=2048 lookahead_size=0 ... page_cache_sync_ra: dev=252:16 ino=e index=129024 req_count=2048 order=0 size=2048 async_size=1024 ra_pages=2048 mmap_miss=0 prev_pos=-1 page_cache_ra_unbounded: dev=252:16 ino=e index=129024 nr_to_read=2048 lookahead_size=0 Cc: linux-mm@kvack.org Cc: Matthew Wilcox (Oracle) Signed-off-by: Jaegeuk Kim --- mm/readahead.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/mm/readahead.c b/mm/readahead.c index e88425ce06f7..54c78f8276fe 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -340,6 +340,7 @@ void force_page_cache_ra(struct readahead_control *ractl, unsigned long nr_to_read) { struct address_space *mapping = ractl->mapping; + struct inode *inode = mapping->host; struct backing_dev_info *bdi = inode_to_bdi(mapping->host); unsigned long this_chunk; @@ -352,11 +353,19 @@ void force_page_cache_ra(struct readahead_control *ractl, this_chunk = max_t(unsigned long, bdi->io_pages, ractl->ra->ra_pages); while (nr_to_read) { - this_chunk = min_t(unsigned long, this_chunk, nr_to_read); + unsigned long index = readahead_index(ractl); + pgoff_t end_index = (i_size_read(inode) - 1) >> PAGE_SHIFT; - if (do_page_cache_ra(ractl, this_chunk, 0)) + if (index > end_index) break; + if (nr_to_read > end_index - index) + nr_to_read = end_index - index + 1; + + this_chunk = min_t(unsigned long, this_chunk, nr_to_read); + + page_cache_sync_ra(ractl, this_chunk); + nr_to_read -= this_chunk; } } @@ -573,7 +582,7 @@ void page_cache_sync_ra(struct readahead_control *ractl, /* be dumb */ if (do_forced_ra) { - force_page_cache_ra(ractl, req_count); + do_page_cache_ra(ractl, req_count, 0); return; } -- 2.52.0.107.ga0afd4fd5b-goog