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ext4: add more tracepoints and use dev_t in the trace buffer

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- Add more ext4 tracepoints.
- Change ext4 tracepoints to use dev_t field with MAJOR/MINOR macros
so that we can save 4 bytes in the ring buffer on some platforms.
- Add sync_mode to ext4_da_writepages, ext4_da_write_pages, and
ext4_da_writepages_result tracepoints. Also remove for_reclaim
field from ext4_da_writepages since it is usually not very useful.

Signed-off-by: Jiaying Zhang <jiayingz@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jiaying Zhang
2011-03-21 21:38:05 -04:00
committed by Theodore Ts'o
parent 4596fe0767
commit 0562e0bad4
8 changed files with 658 additions and 253 deletions
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13
fs/ext4/extents.c
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@@ -44,6 +44,8 @@
#include "ext4_jbd2.h"
#include "ext4_extents.h"
#include <trace/events/ext4.h>
static int ext4_ext_truncate_extend_restart(handle_t *handle,
struct inode *inode,
int needed)
@@ -664,6 +666,8 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
if (unlikely(!bh))
goto err;
if (!bh_uptodate_or_lock(bh)) {
trace_ext4_ext_load_extent(inode, block,
path[ppos].p_block);
if (bh_submit_read(bh) < 0) {
put_bh(bh);
goto err;
@@ -3297,7 +3301,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path = NULL;
struct ext4_extent_header *eh;
struct ext4_extent newex, *ex;
ext4_fsblk_t newblock;
ext4_fsblk_t newblock = 0;
int err = 0, depth, ret;
unsigned int allocated = 0;
struct ext4_allocation_request ar;
@@ -3305,6 +3309,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
ext_debug("blocks %u/%u requested for inode %lu\n",
map->m_lblk, map->m_len, inode->i_ino);
trace_ext4_ext_map_blocks_enter(inode, map->m_lblk, map->m_len, flags);
/* check in cache */
if (ext4_ext_in_cache(inode, map->m_lblk, &newex)) {
@@ -3525,6 +3530,8 @@ out2:
ext4_ext_drop_refs(path);
kfree(path);
}
trace_ext4_ext_map_blocks_exit(inode, map->m_lblk,
newblock, map->m_len, err ? err : allocated);
return err ? err : allocated;
}
@@ -3658,6 +3665,7 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
return -EOPNOTSUPP;
trace_ext4_fallocate_enter(inode, offset, len, mode);
map.m_lblk = offset >> blkbits;
/*
* We can't just convert len to max_blocks because
@@ -3673,6 +3681,7 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
ret = inode_newsize_ok(inode, (len + offset));
if (ret) {
mutex_unlock(&inode->i_mutex);
trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
return ret;
}
retry:
@@ -3717,6 +3726,8 @@ retry:
goto retry;
}
mutex_unlock(&inode->i_mutex);
trace_ext4_fallocate_exit(inode, offset, max_blocks,
ret > 0 ? ret2 : ret);
return ret > 0 ? ret2 : ret;
}