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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH v4 1/3] mm: Merge folio_has_private()/filemap_release_folio() call pairs From: David Howells To: Linus Torvalds Cc: Rohith Surabattula , Matthew Wilcox , Matthew Wilcox , Steve French , Shyam Prasad N , Rohith Surabattula , Dave Wysochanski , Dominique Martinet , Ilya Dryomov , linux-cachefs@redhat.com, linux-cifs@vger.kernel.org, linux-afs@lists.infradead.org, v9fs-developer@lists.sourceforge.net, ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, dhowells@redhat.com, Matthew Wilcox , Jeff Layton , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-erofs@lists.ozlabs.org, linux-cachefs@redhat.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 23 Nov 2022 22:48:35 +0000 Message-ID: <166924371591.1772793.13893659228628027575.stgit@warthog.procyon.org.uk> In-Reply-To: <166924370539.1772793.13730698360771821317.stgit@warthog.procyon.org.uk> References: <166924370539.1772793.13730698360771821317.stgit@warthog.procyon.org.uk> User-Agent: StGit/1.5 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.7 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669243727; a=rsa-sha256; cv=none; b=rhD7pRX/Mmq0tsFbly1QNWUqsY/HCw6lXV74gsdv9cinyK+lgv70ECuZWJAy8i8bxx0lDF +yAzBrnW0FstnMagwMID8ropcq6pRDfVtd364T8ubcPFXuSxuYMEhesfpAg6uD0c1LX2u/ nY0DhLPsDnTaTol92wKDFDkzk07Z7p8= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=KogU8PHv; spf=pass (imf30.hostedemail.com: domain of dhowells@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=dhowells@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669243727; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=qMSc8ri6PgRiNUl02Z6CVVLfho7VNuVLjNpxfTm/Xl8=; b=gv4OQO3lNDicC6s4QXkgHZfa2Vp4jO8pssUWF7b0feYB5CgfxXibQTY2wOiMvSk97yI+qI O8vP8X7bCcaYnepKeYAVVkQ+b/oQSxHZvbT+qmFFkIM9UDfxWSvzUybO3ZzIi8Fcje6Psd r2XJDbteNb5RIDqCmHTEJnNlj8Ot6jQ= X-Rspam-User: X-Rspamd-Queue-Id: EA10A80012 Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=KogU8PHv; spf=pass (imf30.hostedemail.com: domain of dhowells@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=dhowells@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: zu8zukzibw3y8a33byqodix15b8k4dic X-Rspamd-Server: rspam10 X-HE-Tag: 1669243726-376300 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: Make filemap_release_folio() check folio_has_private(). Then, in most cases, where a call to folio_has_private() is immediately followed by a call to filemap_release_folio(), we can get rid of the test in the pair. The same is done to page_has_private()/try_to_release_page() call pairs. There are a couple of sites in mm/vscan.c that this can't so easily be done. In shrink_folio_list(), there are actually three cases (something different is done for incompletely invalidated buffers), but filemap_release_folio() elides two of them. In shrink_active_list(), we don't have have the folio lock yet, so the check allows us to avoid locking the page unnecessarily. A wrapper function to check if a folio needs release is provided for those places that still need to do it in the mm/ directory. This will acquire additional parts to the condition in a future patch. Changes: ======== ver #4) - Split from fscache fix. - Moved folio_needs_release() to mm/internal.h and removed open-coded version from filemap_release_folio(). ver #3) - Fixed mapping_clear_release_always() to use clear_bit() not set_bit(). - Moved a '&&' to the correct line. ver #2) - Rewrote entirely according to Willy's suggestion[1]. Reported-by: Rohith Surabattula Suggested-by: Matthew Wilcox Signed-off-by: David Howells cc: Matthew Wilcox cc: Linus Torvalds cc: Steve French cc: Shyam Prasad N cc: Rohith Surabattula cc: Dave Wysochanski cc: Dominique Martinet cc: Ilya Dryomov cc: linux-cachefs@redhat.com cc: linux-cifs@vger.kernel.org cc: linux-afs@lists.infradead.org cc: v9fs-developer@lists.sourceforge.net cc: ceph-devel@vger.kernel.org cc: linux-nfs@vger.kernel.org cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org Link: https://lore.kernel.org/r/Yk9V/03wgdYi65Lb@casper.infradead.org/ [1] Link: https://lore.kernel.org/r/164928630577.457102.8519251179327601178.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/166844174069.1124521.10890506360974169994.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/166869495238.3720468.4878151409085146764.stgit@warthog.procyon.org.uk/ # v3 Link: https://lore.kernel.org/r/1459152.1669208550@warthog.procyon.org.uk/ # v3 also --- fs/splice.c | 3 +-- mm/filemap.c | 2 ++ mm/huge_memory.c | 3 +-- mm/internal.h | 8 ++++++++ mm/khugepaged.c | 3 +-- mm/memory-failure.c | 3 +-- mm/migrate.c | 3 +-- mm/truncate.c | 6 ++---- mm/vmscan.c | 7 +++---- 9 files changed, 20 insertions(+), 18 deletions(-) diff --git a/fs/splice.c b/fs/splice.c index 0878b852b355..563105304ccc 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -65,8 +65,7 @@ static bool page_cache_pipe_buf_try_steal(struct pipe_inode_info *pipe, */ folio_wait_writeback(folio); - if (folio_has_private(folio) && - !filemap_release_folio(folio, GFP_KERNEL)) + if (!filemap_release_folio(folio, GFP_KERNEL)) goto out_unlock; /* diff --git a/mm/filemap.c b/mm/filemap.c index 08341616ae7a..93757247cd11 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3941,6 +3941,8 @@ bool filemap_release_folio(struct folio *folio, gfp_t gfp) struct address_space * const mapping = folio->mapping; BUG_ON(!folio_test_locked(folio)); + if (!folio_needs_release(folio)) + return true; if (folio_test_writeback(folio)) return false; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 811d19b5c4f6..308d36aa3197 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2683,8 +2683,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list) gfp = current_gfp_context(mapping_gfp_mask(mapping) & GFP_RECLAIM_MASK); - if (folio_test_private(folio) && - !filemap_release_folio(folio, gfp)) { + if (!filemap_release_folio(folio, gfp)) { ret = -EBUSY; goto out; } diff --git a/mm/internal.h b/mm/internal.h index 6b7ef495b56d..1fefb5181ab7 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -163,6 +163,14 @@ static inline void set_page_refcounted(struct page *page) set_page_count(page, 1); } +/* + * Return true if a folio needs ->release_folio() calling upon it. + */ +static inline bool folio_needs_release(struct folio *folio) +{ + return folio_has_private(folio); +} + extern unsigned long highest_memmap_pfn; /* diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 4734315f7940..7e9e0e3e678e 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1883,8 +1883,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr, goto out_unlock; } - if (page_has_private(page) && - !try_to_release_page(page, GFP_KERNEL)) { + if (!try_to_release_page(page, GFP_KERNEL)) { result = SCAN_PAGE_HAS_PRIVATE; putback_lru_page(page); goto out_unlock; diff --git a/mm/memory-failure.c b/mm/memory-failure.c index bead6bccc7f2..82673fc01eed 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -831,8 +831,7 @@ static int truncate_error_page(struct page *p, unsigned long pfn, if (err != 0) { pr_info("%#lx: Failed to punch page: %d\n", pfn, err); - } else if (page_has_private(p) && - !try_to_release_page(p, GFP_NOIO)) { + } else if (!try_to_release_page(p, GFP_NOIO)) { pr_info("%#lx: failed to release buffers\n", pfn); } else { ret = MF_RECOVERED; diff --git a/mm/migrate.c b/mm/migrate.c index dff333593a8a..d721ef340943 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -905,8 +905,7 @@ static int fallback_migrate_folio(struct address_space *mapping, * Buffers may be managed in a filesystem specific way. * We must have no buffers or drop them. */ - if (folio_test_private(src) && - !filemap_release_folio(src, GFP_KERNEL)) + if (!filemap_release_folio(src, GFP_KERNEL)) return mode == MIGRATE_SYNC ? -EAGAIN : -EBUSY; return migrate_folio(mapping, dst, src, mode); diff --git a/mm/truncate.c b/mm/truncate.c index c0be77e5c008..0d4dd233f518 100644 --- a/mm/truncate.c +++ b/mm/truncate.c @@ -19,7 +19,6 @@ #include #include #include -#include /* grr. try_to_release_page */ #include #include #include "internal.h" @@ -276,7 +275,7 @@ static long mapping_evict_folio(struct address_space *mapping, if (folio_ref_count(folio) > folio_nr_pages(folio) + folio_has_private(folio) + 1) return 0; - if (folio_has_private(folio) && !filemap_release_folio(folio, 0)) + if (!filemap_release_folio(folio, 0)) return 0; return remove_mapping(mapping, folio); @@ -581,8 +580,7 @@ static int invalidate_complete_folio2(struct address_space *mapping, if (folio->mapping != mapping) return 0; - if (folio_has_private(folio) && - !filemap_release_folio(folio, GFP_KERNEL)) + if (!filemap_release_folio(folio, GFP_KERNEL)) return 0; spin_lock(&mapping->host->i_lock); diff --git a/mm/vmscan.c b/mm/vmscan.c index 04d8b88e5216..b9316f447238 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1978,7 +1978,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list, * (refcount == 1) it can be freed. Otherwise, leave * the folio on the LRU so it is swappable. */ - if (folio_has_private(folio)) { + if (folio_needs_release(folio)) { if (!filemap_release_folio(folio, sc->gfp_mask)) goto activate_locked; if (!mapping && folio_ref_count(folio) == 1) { @@ -2592,9 +2592,8 @@ static void shrink_active_list(unsigned long nr_to_scan, } if (unlikely(buffer_heads_over_limit)) { - if (folio_test_private(folio) && folio_trylock(folio)) { - if (folio_test_private(folio)) - filemap_release_folio(folio, 0); + if (folio_needs_release(folio) && folio_trylock(folio)) { + filemap_release_folio(folio, 0); folio_unlock(folio); } }