From nobody Tue Dec 16 13:08:12 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC3E5C7EE2F for ; Fri, 26 May 2023 07:56:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242681AbjEZH4h (ORCPT ); Fri, 26 May 2023 03:56:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47374 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242606AbjEZH4L (ORCPT ); Fri, 26 May 2023 03:56:11 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6813C1A8; Fri, 26 May 2023 00:56:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=BlnfxGH65lfjvCr0EihUnLvC6Y04PW1nCflzWem/FI0=; b=VIpL8dc4hJnM3liOcBxChkT+dG qF/usCC/Wup5mmMJmU1p1ovRc9zKDrFe15DpGpCv7f4i3Mhkrt83uK85qdUAizZUBhBrM5tQg3muw w9qV6fP5s+45uiKWkhPQ/0p5NiELflVvmRKmEbG0pYPjuLPUHkYpxlLQuXAICLo5rrMdD6xkn+c+E rf9/tWnG/HUnZedSs/UfiehEuj5H7zzw7q2FxO93KyrsNh4jk7WDlLYwOr+uIr2u7nhmEjEfjoA1u SDKTfqMfG82ro8eQ/SBy9XVW9hsS7XM0naNEQIHkN+T3/w4EOl/8CsAlecOfKgU/m7H4ZeTp2v+wL YZeBlrZw==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.96 #2 (Red Hat Linux)) id 1q2SIj-001WZm-2k; Fri, 26 May 2023 07:55:53 +0000 From: Luis Chamberlain To: hughd@google.com, akpm@linux-foundation.org, willy@infradead.org, brauner@kernel.org, djwong@kernel.org Cc: p.raghav@samsung.com, da.gomez@samsung.com, rohan.puri@samsung.com, rpuri.linux@gmail.com, a.manzanares@samsung.com, dave@stgolabs.net, yosryahmed@google.com, keescook@chromium.org, hare@suse.de, kbusch@kernel.org, mcgrof@kernel.org, patches@lists.linux.dev, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC v2 3/8] shmem: account for high order folios Date: Fri, 26 May 2023 00:55:47 -0700 Message-Id: <20230526075552.363524-4-mcgrof@kernel.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230526075552.363524-1-mcgrof@kernel.org> References: <20230526075552.363524-1-mcgrof@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: Luis Chamberlain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" shmem uses the shem_info_inode alloced, swapped to account for allocated pages and swapped pages. In preparation for high order folios adjust the accounting to use folio_nr_pages(). This should produce no functional changes yet as higher order folios are not yet used or supported in shmem. Signed-off-by: Luis Chamberlain --- mm/shmem.c | 34 ++++++++++++++++++++-------------- 1 file changed, 20 insertions(+), 14 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index a947f2678a39..7bea4c5cb83a 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -803,15 +803,15 @@ unsigned long shmem_partial_swap_usage(struct address= _space *mapping, pgoff_t start, pgoff_t end) { XA_STATE(xas, &mapping->i_pages, start); - struct page *page; + struct folio *folio; unsigned long swapped =3D 0; =20 rcu_read_lock(); - xas_for_each(&xas, page, end - 1) { - if (xas_retry(&xas, page)) + xas_for_each(&xas, folio, end - 1) { + if (xas_retry(&xas, folio)) continue; - if (xa_is_value(page)) - swapped++; + if (xa_is_value(folio)) + swapped +=3D (folio_nr_pages(folio)); =20 if (need_resched()) { xas_pause(&xas); @@ -938,10 +938,12 @@ static void shmem_undo_range(struct inode *inode, lof= f_t lstart, loff_t lend, folio =3D fbatch.folios[i]; =20 if (xa_is_value(folio)) { + long swaps_freed; if (unfalloc) continue; - nr_swaps_freed +=3D !shmem_free_swap(mapping, - indices[i], folio); + swaps_freed =3D folio_nr_pages(folio); + if (!shmem_free_swap(mapping, indices[i], folio)) + nr_swaps_freed +=3D swaps_freed; continue; } =20 @@ -1007,14 +1009,16 @@ static void shmem_undo_range(struct inode *inode, l= off_t lstart, loff_t lend, folio =3D fbatch.folios[i]; =20 if (xa_is_value(folio)) { + long swaps_freed; if (unfalloc) continue; + swaps_freed =3D folio_nr_pages(folio); if (shmem_free_swap(mapping, indices[i], folio)) { /* Swap was replaced by page: retry */ index =3D indices[i]; break; } - nr_swaps_freed++; + nr_swaps_freed +=3D swaps_freed; continue; } =20 @@ -1445,7 +1449,7 @@ static int shmem_writepage(struct page *page, struct = writeback_control *wbc) NULL) =3D=3D 0) { spin_lock_irq(&info->lock); shmem_recalc_inode(inode); - info->swapped++; + info->swapped +=3D folio_nr_pages(folio); spin_unlock_irq(&info->lock); =20 swap_shmem_alloc(swap); @@ -1720,6 +1724,7 @@ static void shmem_set_folio_swapin_error(struct inode= *inode, pgoff_t index, struct shmem_inode_info *info =3D SHMEM_I(inode); swp_entry_t swapin_error; void *old; + long num_swap_pages; =20 swapin_error =3D make_swapin_error_entry(); old =3D xa_cmpxchg_irq(&mapping->i_pages, index, @@ -1729,6 +1734,7 @@ static void shmem_set_folio_swapin_error(struct inode= *inode, pgoff_t index, return; =20 folio_wait_writeback(folio); + num_swap_pages =3D folio_nr_pages(folio); delete_from_swap_cache(folio); spin_lock_irq(&info->lock); /* @@ -1736,8 +1742,8 @@ static void shmem_set_folio_swapin_error(struct inode= *inode, pgoff_t index, * be 0 when inode is released and thus trigger WARN_ON(inode->i_blocks) = in * shmem_evict_inode. */ - info->alloced--; - info->swapped--; + info->alloced -=3D num_swap_pages; + info->swapped -=3D num_swap_pages; shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); swap_free(swap); @@ -1827,7 +1833,7 @@ static int shmem_swapin_folio(struct inode *inode, pg= off_t index, goto failed; =20 spin_lock_irq(&info->lock); - info->swapped--; + info->swapped -=3D folio_nr_pages(folio); shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); =20 @@ -2542,8 +2548,8 @@ int shmem_mfill_atomic_pte(pmd_t *dst_pmd, goto out_delete_from_cache; =20 spin_lock_irq(&info->lock); - info->alloced++; - inode->i_blocks +=3D PAGE_SECTORS; + info->alloced +=3D folio_nr_pages(folio); + inode->i_blocks +=3D PAGE_SECTORS << folio_order(folio); shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); =20 --=20 2.39.2