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ext4: Add new tracepoint: trace_ext4_da_write_pages() 

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);

34
include/trace/events/ext4.h
View File

@ -251,6 +251,40 @@ TRACE_EVENT(ext4_da_writepages,
__entry->range_cyclic)
);
TRACE_EVENT(ext4_da_write_pages,
TP_PROTO(struct inode *inode, struct mpage_da_data *mpd),
TP_ARGS(inode, mpd),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
__field( __u64, b_blocknr )
__field( __u32, b_size )
__field( __u32, b_state )
__field( unsigned long, first_page )
__field( int, io_done )
__field( int, pages_written )
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->b_blocknr = mpd->b_blocknr;
__entry->b_size = mpd->b_size;
__entry->b_state = mpd->b_state;
__entry->first_page = mpd->first_page;
__entry->io_done = mpd->io_done;
__entry->pages_written = mpd->pages_written;
),
TP_printk("dev %s ino %lu b_blocknr %llu b_size %u b_state 0x%04x first_page %lu io_done %d pages_written %d",
jbd2_dev_to_name(__entry->dev), __entry->ino,
__entry->b_blocknr, __entry->b_size,
__entry->b_state, __entry->first_page,
__entry->io_done, __entry->pages_written)
);
TRACE_EVENT(ext4_da_writepages_result,
TP_PROTO(struct inode *inode, struct writeback_control *wbc,
int ret, int pages_written),