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[XFS] Improve buffered read throughput by removing unnecessary timer calls

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that showed in ´kernel profiles.

SGI-PV: 925163
SGI-Modid: xfs-linux:xfs-kern:23861a

Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Nathan Scott
2005-11-02 11:43:58 +11:00
parent 0fdfb3757f
commit 4aeb664c25
5 changed files with 140 additions and 84 deletions
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67
fs/xfs/xfs_inode.c
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@@ -3688,73 +3688,6 @@ xfs_iroundup(
return( 0 );
}
/*
* Change the requested timestamp in the given inode.
* We don't lock across timestamp updates, and we don't log them but
* we do record the fact that there is dirty information in core.
*
* NOTE -- callers MUST combine XFS_ICHGTIME_MOD or XFS_ICHGTIME_CHG
* with XFS_ICHGTIME_ACC to be sure that access time
* update will take. Calling first with XFS_ICHGTIME_ACC
* and then XFS_ICHGTIME_MOD may fail to modify the access
* timestamp if the filesystem is mounted noacctm.
*/
void
xfs_ichgtime(xfs_inode_t *ip,
int flags)
{
timespec_t tv;
vnode_t *vp = XFS_ITOV(ip);
struct inode *inode = LINVFS_GET_IP(vp);
/*
* We're not supposed to change timestamps in readonly-mounted
* filesystems. Throw it away if anyone asks us.
*/
if (unlikely(vp->v_vfsp->vfs_flag & VFS_RDONLY))
return;
/*
* Don't update access timestamps on reads if mounted "noatime"
* Throw it away if anyone asks us.
*/
if ((ip->i_mount->m_flags & XFS_MOUNT_NOATIME || IS_NOATIME(inode)) &&
((flags & (XFS_ICHGTIME_ACC|XFS_ICHGTIME_MOD|XFS_ICHGTIME_CHG))
== XFS_ICHGTIME_ACC))
return;
nanotime(&tv);
if (flags & XFS_ICHGTIME_MOD) {
VN_MTIMESET(vp, &tv);
ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
}
if (flags & XFS_ICHGTIME_ACC) {
VN_ATIMESET(vp, &tv);
ip->i_d.di_atime.t_sec = (__int32_t)tv.tv_sec;
ip->i_d.di_atime.t_nsec = (__int32_t)tv.tv_nsec;
}
if (flags & XFS_ICHGTIME_CHG) {
VN_CTIMESET(vp, &tv);
ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec;
ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec;
}
/*
* We update the i_update_core field _after_ changing
* the timestamps in order to coordinate properly with
* xfs_iflush() so that we don't lose timestamp updates.
* This keeps us from having to hold the inode lock
* while doing this. We use the SYNCHRONIZE macro to
* ensure that the compiler does not reorder the update
* of i_update_core above the timestamp updates above.
*/
SYNCHRONIZE();
ip->i_update_core = 1;
if (!(inode->i_state & I_LOCK))
mark_inode_dirty_sync(inode);
}
#ifdef XFS_ILOCK_TRACE
ktrace_t *xfs_ilock_trace_buf;