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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	linux-fsdevel@vger.kernel.org
Subject: [PATCH 2/3] fs: Document file_ra_state
Date: Wed,  7 Apr 2021 21:18:56 +0100	[thread overview]
Message-ID: <20210407201857.3582797-3-willy@infradead.org> (raw)
In-Reply-To: <20210407201857.3582797-1-willy@infradead.org>

Turn the comments into kernel-doc and improve the wording slightly.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 include/linux/fs.h | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3fbb98126248..8c347fe9783d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -889,18 +889,22 @@ struct fown_struct {
 	int signum;		/* posix.1b rt signal to be delivered on IO */
 };
 
-/*
- * Track a single file's readahead state
+/**
+ * struct file_ra_state - Track a file's readahead state.
+ * @start: Where the most recent readahead started.
+ * @size: Number of pages read in the most recent readahead.
+ * @async_size: Start next readahead when this many pages are left.
+ * @ra_pages: Maximum size of a readahead request.
+ * @mmap_miss: How many mmap accesses missed in the page cache.
+ * @prev_pos: The last byte in the most recent read request.
  */
 struct file_ra_state {
-	pgoff_t start;			/* where readahead started */
-	unsigned int size;		/* # of readahead pages */
-	unsigned int async_size;	/* do asynchronous readahead when
-					   there are only # of pages ahead */
-
-	unsigned int ra_pages;		/* Maximum readahead window */
-	unsigned int mmap_miss;		/* Cache miss stat for mmap accesses */
-	loff_t prev_pos;		/* Cache last read() position */
+	pgoff_t start;
+	unsigned int size;
+	unsigned int async_size;
+	unsigned int ra_pages;
+	unsigned int mmap_miss;
+	loff_t prev_pos;
 };
 
 /*
-- 
2.30.2


  parent reply	other threads:[~2021-04-07 20:21 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 20:18 [PATCH 0/3] readahead improvements Matthew Wilcox (Oracle)
2021-04-07 20:18 ` [PATCH 1/3] mm/filemap: Pass the file_ra_state in the ractl Matthew Wilcox (Oracle)
2021-04-07 20:18 ` Matthew Wilcox (Oracle) [this message]
2021-04-07 20:18 ` [PATCH 3/3] mm/readahead: Adjust file_ra in readahead_expand Matthew Wilcox (Oracle)
2021-04-07 22:43 ` [PATCH 0/3] readahead improvements David Howells
2021-04-08 10:57 ` riteshh
2021-04-08 13:15   ` Brendan Gregg
2021-04-08 12:51 ` [PATCH] mm, netfs: Fix readahead bits David Howells
2021-04-08 13:09   ` Matthew Wilcox

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