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ext4: Add new tracepoint: trace_ext4_da_write_pages()

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Add a new tracepoint which shows the pages that will be written using
write_cache_pages() by ext4_da_writepages().

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2009-08-31 23:13:11 -04:00
parent de89de6e0c
commit b3a3ca8ca0
3 changed files with 50 additions and 12 deletions
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15
fs/ext4/ext4.h
View File

@@ -113,6 +113,21 @@ struct ext4_allocation_request {
unsigned int flags;
};
/*
* For delayed allocation tracking
*/
struct mpage_da_data {
struct inode *inode;
sector_t b_blocknr; /* start block number of extent */
size_t b_size; /* size of extent */
unsigned long b_state; /* state of the extent */
unsigned long first_page, next_page; /* extent of pages */
struct writeback_control *wbc;
int io_done;
int pages_written;
int retval;
};
/*
* Special inodes numbers
*/

13
fs/ext4/inode.c
View File

@@ -1875,18 +1875,6 @@ static void ext4_da_page_release_reservation(struct page *page,
* Delayed allocation stuff
*/
struct mpage_da_data {
struct inode *inode;
sector_t b_blocknr; /* start block number of extent */
size_t b_size; /* size of extent */
unsigned long b_state; /* state of the extent */
unsigned long first_page, next_page; /* extent of pages */
struct writeback_control *wbc;
int io_done;
int pages_written;
int retval;
};
/*
* mpage_da_submit_io - walks through extent of pages and try to write
* them with writepage() call back
@@ -2863,6 +2851,7 @@ retry:
mpd.io_done = 1;
ret = MPAGE_DA_EXTENT_TAIL;
}
trace_ext4_da_write_pages(inode, &mpd);
wbc->nr_to_write -= mpd.pages_written;
ext4_journal_stop(handle);