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Thu, 26 Mar 2026 10:47:26 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.33.121]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 8E95019560B1; Thu, 26 Mar 2026 10:47:19 +0000 (UTC) From: David Howells To: Christian Brauner , Matthew Wilcox , Christoph Hellwig Cc: David Howells , Paulo Alcantara , Jens Axboe , Leon Romanovsky , Steve French , ChenXiaoSong , Marc Dionne , Eric Van Hensbergen , Dominique Martinet , Ilya Dryomov , Trond Myklebust , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Paulo Alcantara , linux-mm@kvack.org Subject: [PATCH 09/26] mm: Make readahead store folio count in readahead_control Date: Thu, 26 Mar 2026 10:45:24 +0000 Message-ID: <20260326104544.509518-10-dhowells@redhat.com> In-Reply-To: <20260326104544.509518-1-dhowells@redhat.com> References: <20260326104544.509518-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-MFC-PROC-ID: 4tvWGGPxw87XmAGWdisvZOntRwfLwKbx2V5iQ-NTXy0_1774522046 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: EB525100004 X-Stat-Signature: ywzayju8do5xpqaiyhk6wwx5u8nmyyf5 X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1774522055-94762 X-HE-Meta: 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 Uy5SM2fX 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Make readahead store folio count in readahead_control so that the filesystem can know in advance how many folios it needs to keep track of. Signed-off-by: David Howells cc: Paulo Alcantara cc: Matthew Wilcox cc: netfs@lists.linux.dev cc: linux-mm@kvack.org cc: linux-fsdevel@vger.kernel.org --- include/linux/pagemap.h | 1 + mm/readahead.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index ec442af3f886..3c3e34e5fe8a 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -1361,6 +1361,7 @@ struct readahead_control { struct file_ra_state *ra; /* private: use the readahead_* accessors instead */ pgoff_t _index; + unsigned int _nr_folios; unsigned int _nr_pages; unsigned int _batch_count; bool dropbehind; diff --git a/mm/readahead.c b/mm/readahead.c index 7b05082c89ea..53134c9d9fe9 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -292,6 +292,7 @@ void page_cache_ra_unbounded(struct readahead_control *ractl, if (i == mark) folio_set_readahead(folio); ractl->_workingset |= folio_test_workingset(folio); + ractl->_nr_folios++; ractl->_nr_pages += min_nrpages; i += min_nrpages; } @@ -459,6 +460,7 @@ static inline int ra_alloc_folio(struct readahead_control *ractl, pgoff_t index, return err; } + ractl->_nr_folios++; ractl->_nr_pages += 1UL << order; ractl->_workingset |= folio_test_workingset(folio); return 0; @@ -802,6 +804,7 @@ void readahead_expand(struct readahead_control *ractl, ractl->_workingset = true; psi_memstall_enter(&ractl->_pflags); } + ractl->_nr_folios++; ractl->_nr_pages += min_nrpages; ractl->_index = folio->index; } @@ -831,6 +834,7 @@ void readahead_expand(struct readahead_control *ractl, ractl->_workingset = true; psi_memstall_enter(&ractl->_pflags); } + ractl->_nr_folios++; ractl->_nr_pages += min_nrpages; if (ra) { ra->size += min_nrpages;