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xfs: log timestamp updates

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Timestamps on regular files are the last metadata that XFS does not update
transactionally.  Now that we use the delaylog mode exclusively and made
the log scode scale extremly well there is no need to bypass that code for
timestamp updates.  Logging all updates allows to drop a lot of code, and
will allow for further performance improvements later on.

Note that this patch drops optimized handling of fdatasync - it will be
added back in a separate commit.

Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2012-02-29 09:53:52 +00:00 committed by Ben Myers
parent 281627df3e
commit 8a9c9980f2
13 changed files with 65 additions and 321 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
fs/xfs/xfs_file.c
View File

@ -163,7 +163,6 @@ xfs_file_fsync(
struct inode *inode = file->f_mapping->host;
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
int error = 0;
int log_flushed = 0;
xfs_lsn_t lsn = 0;
@ -194,75 +193,15 @@ xfs_file_fsync(
}
/*
* We always need to make sure that the required inode state is safe on
* disk. The inode might be clean but we still might need to force the
* log because of committed transactions that haven't hit the disk yet.
* Likewise, there could be unflushed non-transactional changes to the
* inode core that have to go to disk and this requires us to issue
* a synchronous transaction to capture these changes correctly.
*
* This code relies on the assumption that if the i_update_core field
* of the inode is clear and the inode is unpinned then it is clean
* and no action is required.
* All metadata updates are logged, which means that we just have
* to flush the log up to the latest LSN that touched the inode.
*/
xfs_ilock(ip, XFS_ILOCK_SHARED);
/*
* First check if the VFS inode is marked dirty. All the dirtying
* of non-transactional updates do not go through mark_inode_dirty*,
* which allows us to distinguish between pure timestamp updates
* and i_size updates which need to be caught for fdatasync.
* After that also check for the dirty state in the XFS inode, which
* might gets cleared when the inode gets written out via the AIL
* or xfs_iflush_cluster.
*/
if (((inode->i_state & I_DIRTY_DATASYNC) ||
((inode->i_state & I_DIRTY_SYNC) && !datasync)) &&
ip->i_update_core) {
/*
* Kick off a transaction to log the inode core to get the
* updates. The sync transaction will also force the log.
*/
xfs_iunlock(ip, XFS_ILOCK_SHARED);
tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
error = xfs_trans_reserve(tp, 0,
XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
if (error) {
xfs_trans_cancel(tp, 0);
return -error;
}
xfs_ilock(ip, XFS_ILOCK_EXCL);
/*
* Note - it's possible that we might have pushed ourselves out
* of the way during trans_reserve which would flush the inode.
* But there's no guarantee that the inode buffer has actually
* gone out yet (it's delwri). Plus the buffer could be pinned
* anyway if it's part of an inode in another recent
* transaction. So we play it safe and fire off the
* transaction anyway.
*/
xfs_trans_ijoin(tp, ip, 0);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_trans_commit(tp, 0);
lsn = ip->i_itemp->ili_last_lsn;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
} else {
/*
* Timestamps/size haven't changed since last inode flush or
* inode transaction commit. That means either nothing got
* written or a transaction committed which caught the updates.
* If the latter happened and the transaction hasn't hit the
* disk yet, the inode will be still be pinned. If it is,
* force the log.
*/
if (xfs_ipincount(ip))
lsn = ip->i_itemp->ili_last_lsn;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
}
if (!error && lsn)
if (lsn)
error = _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, &log_flushed);
/*
@ -659,9 +598,6 @@ xfs_file_aio_write_checks(
return error;
}
if (likely(!(file->f_mode & FMODE_NOCMTIME)))
file_update_time(file);
/*
* If the offset is beyond the size of the file, we need to zero any
* blocks that fall between the existing EOF and the start of this
@ -684,6 +620,15 @@ xfs_file_aio_write_checks(
if (error)
return error;
/*
* Updating the timestamps will grab the ilock again from
* xfs_fs_dirty_inode, so we have to call it after dropping the
* lock above. Eventually we should look into a way to avoid
* the pointless lock roundtrip.
*/
if (likely(!(file->f_mode & FMODE_NOCMTIME)))
file_update_time(file);
/*
* If we're writing the file then make sure to clear the setuid and
* setgid bits if the process is not being run by root. This keeps

1
fs/xfs/xfs_iget.c
View File

@ -91,7 +91,6 @@ xfs_inode_alloc(
ip->i_afp = NULL;
memset(&ip->i_df, 0, sizeof(xfs_ifork_t));
ip->i_flags = 0;
ip->i_update_core = 0;
ip->i_delayed_blks = 0;
memset(&ip->i_d, 0, sizeof(xfs_icdinode_t));

25
fs/xfs/xfs_inode.c
View File

@ -1656,7 +1656,6 @@ xfs_ifree_cluster(
iip = ip->i_itemp;
if (!iip || xfs_inode_clean(ip)) {
ASSERT(ip != free_ip);
ip->i_update_core = 0;
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
continue;
@ -2451,7 +2450,6 @@ xfs_iflush(
* to disk, because the log record didn't make it to disk!
*/
if (XFS_FORCED_SHUTDOWN(mp)) {
ip->i_update_core = 0;
if (iip)
iip->ili_format.ilf_fields = 0;
xfs_ifunlock(ip);
@ -2533,26 +2531,6 @@ xfs_iflush_int(
/* set *dip = inode's place in the buffer */
dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
/*
* Clear i_update_core before copying out the data.
* This is for coordination with our timestamp updates
* that don't hold the inode lock. They will always
* update the timestamps BEFORE setting i_update_core,
* so if we clear i_update_core after they set it we
* are guaranteed to see their updates to the timestamps.
* I believe that this depends on strongly ordered memory
* semantics, but we have that. We use the SYNCHRONIZE
* macro to make sure that the compiler does not reorder
* the i_update_core access below the data copy below.
*/
ip->i_update_core = 0;
SYNCHRONIZE();
/*
* Make sure to get the latest timestamps from the Linux inode.
*/
xfs_synchronize_times(ip);
if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC),
mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) {
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
@ -2711,8 +2689,7 @@ xfs_iflush_int(
} else {
/*
* We're flushing an inode which is not in the AIL and has
* not been logged but has i_update_core set. For this
* case we can use a B_DELWRI flush and immediately drop
* not been logged. For this case we can immediately drop
* the inode flush lock because we can avoid the whole
* AIL state thing. It's OK to drop the flush lock now,
* because we've already locked the buffer and to do anything

5
fs/xfs/xfs_inode.h
View File

@ -241,7 +241,6 @@ typedef struct xfs_inode {
spinlock_t i_flags_lock; /* inode i_flags lock */
/* Miscellaneous state. */
unsigned long i_flags; /* see defined flags below */
unsigned char i_update_core; /* timestamps/size is dirty */
unsigned int i_delayed_blks; /* count of delay alloc blks */
xfs_icdinode_t i_d; /* most of ondisk inode */
@ -534,10 +533,6 @@ void xfs_promote_inode(struct xfs_inode *);
void xfs_lock_inodes(xfs_inode_t **, int, uint);
void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
void xfs_synchronize_times(xfs_inode_t *);
void xfs_mark_inode_dirty(xfs_inode_t *);
void xfs_mark_inode_dirty_sync(xfs_inode_t *);
#define IHOLD(ip) \
do { \
ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \

36
fs/xfs/xfs_inode_item.c
View File

@ -254,42 +254,6 @@ xfs_inode_item_format(
vecp++;
nvecs = 1;
/*
* Clear i_update_core if the timestamps (or any other
* non-transactional modification) need flushing/logging
* and we're about to log them with the rest of the core.
*
* This is the same logic as xfs_iflush() but this code can't
* run at the same time as xfs_iflush because we're in commit
* processing here and so we have the inode lock held in
* exclusive mode. Although it doesn't really matter
* for the timestamps if both routines were to grab the
* timestamps or not. That would be ok.
*
* We clear i_update_core before copying out the data.
* This is for coordination with our timestamp updates
* that don't hold the inode lock. They will always
* update the timestamps BEFORE setting i_update_core,
* so if we clear i_update_core after they set it we
* are guaranteed to see their updates to the timestamps
* either here. Likewise, if they set it after we clear it
* here, we'll see it either on the next commit of this
* inode or the next time the inode gets flushed via
* xfs_iflush(). This depends on strongly ordered memory
* semantics, but we have that. We use the SYNCHRONIZE
* macro to make sure that the compiler does not reorder
* the i_update_core access below the data copy below.
*/
if (ip->i_update_core) {
ip->i_update_core = 0;
SYNCHRONIZE();
}
/*
* Make sure to get the latest timestamps from the Linux inode.
*/
xfs_synchronize_times(ip);
vecp->i_addr = &ip->i_d;
vecp->i_len = sizeof(struct xfs_icdinode);
vecp->i_type = XLOG_REG_TYPE_ICORE;

5
fs/xfs/xfs_inode_item.h
View File

@ -148,9 +148,8 @@ typedef struct xfs_inode_log_item {
static inline int xfs_inode_clean(xfs_inode_t *ip)
{
return (!ip->i_itemp ||
!(ip->i_itemp->ili_format.ilf_fields & XFS_ILOG_ALL)) &&
!ip->i_update_core;
return !ip->i_itemp ||
!(ip->i_itemp->ili_format.ilf_fields & XFS_ILOG_ALL);
}
extern void xfs_inode_item_init(struct xfs_inode *, struct xfs_mount *);

58
fs/xfs/xfs_iops.c
View File

@ -50,59 +50,6 @@
#include <linux/fiemap.h>
#include <linux/slab.h>
/*
* Bring the timestamps in the XFS inode uptodate.
*
* Used before writing the inode to disk.
*/
void
xfs_synchronize_times(
xfs_inode_t *ip)
{
struct inode *inode = VFS_I(ip);
ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
ip->i_d.di_ctime.t_sec = (__int32_t)inode->i_ctime.tv_sec;
ip->i_d.di_ctime.t_nsec = (__int32_t)inode->i_ctime.tv_nsec;
ip->i_d.di_mtime.t_sec = (__int32_t)inode->i_mtime.tv_sec;
ip->i_d.di_mtime.t_nsec = (__int32_t)inode->i_mtime.tv_nsec;
}
/*
* If the linux inode is valid, mark it dirty, else mark the dirty state
* in the XFS inode to make sure we pick it up when reclaiming the inode.
*/
void
xfs_mark_inode_dirty_sync(
xfs_inode_t *ip)
{
struct inode *inode = VFS_I(ip);
if (!(inode->i_state & (I_WILL_FREE|I_FREEING)))
mark_inode_dirty_sync(inode);
else {
barrier();
ip->i_update_core = 1;
}
}
void
xfs_mark_inode_dirty(
xfs_inode_t *ip)
{
struct inode *inode = VFS_I(ip);
if (!(inode->i_state & (I_WILL_FREE|I_FREEING)))
mark_inode_dirty(inode);
else {
barrier();
ip->i_update_core = 1;
}
}
int xfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *fs_info)
{
@ -678,19 +625,16 @@ xfs_setattr_nonsize(
inode->i_atime = iattr->ia_atime;
ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
ip->i_update_core = 1;
}
if (mask & ATTR_CTIME) {
inode->i_ctime = iattr->ia_ctime;
ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
ip->i_update_core = 1;
}
if (mask & ATTR_MTIME) {
inode->i_mtime = iattr->ia_mtime;
ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
ip->i_update_core = 1;
}
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
@ -918,13 +862,11 @@ xfs_setattr_size(
inode->i_ctime = iattr->ia_ctime;
ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
ip->i_update_core = 1;
}
if (mask & ATTR_MTIME) {
inode->i_mtime = iattr->ia_mtime;
ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
ip->i_update_core = 1;
}
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

21
fs/xfs/xfs_itable.c
View File

@ -62,7 +62,6 @@ xfs_bulkstat_one_int(
{
struct xfs_icdinode *dic; /* dinode core info pointer */
struct xfs_inode *ip; /* incore inode pointer */
struct inode *inode;
struct xfs_bstat *buf; /* return buffer */
int error = 0; /* error value */
@ -86,7 +85,6 @@ xfs_bulkstat_one_int(
ASSERT(ip->i_imap.im_blkno != 0);
dic = &ip->i_d;
inode = VFS_I(ip);
/* xfs_iget returns the following without needing
* further change.
@ -99,19 +97,12 @@ xfs_bulkstat_one_int(
buf->bs_uid = dic->di_uid;
buf->bs_gid = dic->di_gid;
buf->bs_size = dic->di_size;
/*
* We need to read the timestamps from the Linux inode because
* the VFS keeps writing directly into the inode structure instead
* of telling us about the updates.
*/
buf->bs_atime.tv_sec = inode->i_atime.tv_sec;
buf->bs_atime.tv_nsec = inode->i_atime.tv_nsec;
buf->bs_mtime.tv_sec = inode->i_mtime.tv_sec;
buf->bs_mtime.tv_nsec = inode->i_mtime.tv_nsec;
buf->bs_ctime.tv_sec = inode->i_ctime.tv_sec;
buf->bs_ctime.tv_nsec = inode->i_ctime.tv_nsec;
buf->bs_atime.tv_sec = dic->di_atime.t_sec;
buf->bs_atime.tv_nsec = dic->di_atime.t_nsec;
buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
buf->bs_xflags = xfs_ip2xflags(ip);
buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
buf->bs_extents = dic->di_nextents;

106
fs/xfs/xfs_super.c
View File

@ -863,91 +863,58 @@ xfs_fs_inode_init_once(
}
/*
* Dirty the XFS inode when mark_inode_dirty_sync() is called so that
* we catch unlogged VFS level updates to the inode.
* This is called by the VFS when dirtying inode metadata. This can happen
* for a few reasons, but we only care about timestamp updates, given that
* we handled the rest ourselves. In theory no other calls should happen,
* but for example generic_write_end() keeps dirtying the inode after
* updating i_size. Thus we check that the flags are exactly I_DIRTY_SYNC,
* and skip this call otherwise.
*
* We need the barrier() to maintain correct ordering between unlogged
* updates and the transaction commit code that clears the i_update_core
* field. This requires all updates to be completed before marking the
* inode dirty.
* We'll hopefull get a different method just for updating timestamps soon,
* at which point this hack can go away, and maybe we'll also get real
* error handling here.
*/
STATIC void
xfs_fs_dirty_inode(
struct inode *inode,
int flags)
{
barrier();
XFS_I(inode)->i_update_core = 1;
}
STATIC int
xfs_fs_write_inode(
struct inode *inode,
struct writeback_control *wbc)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
int error = EAGAIN;
struct xfs_trans *tp;
int error;
trace_xfs_write_inode(ip);
if (flags != I_DIRTY_SYNC)
return;
if (XFS_FORCED_SHUTDOWN(mp))
return -XFS_ERROR(EIO);
trace_xfs_dirty_inode(ip);
if (wbc->sync_mode == WB_SYNC_ALL || wbc->for_kupdate) {
/*
* Make sure the inode has made it it into the log. Instead
* of forcing it all the way to stable storage using a
* synchronous transaction we let the log force inside the
* ->sync_fs call do that for thus, which reduces the number
* of synchronous log forces dramatically.
*/
error = xfs_log_dirty_inode(ip, NULL, 0);
if (error)
goto out;
return 0;
} else {
if (!ip->i_update_core)
return 0;
/*
* We make this non-blocking if the inode is contended, return
* EAGAIN to indicate to the caller that they did not succeed.
* This prevents the flush path from blocking on inodes inside
* another operation right now, they get caught later by
* xfs_sync.
*/
if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
goto out;
if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip))
goto out_unlock;
/*
* Now we have the flush lock and the inode is not pinned, we
* can check if the inode is really clean as we know that
* there are no pending transaction completions, it is not
* waiting on the delayed write queue and there is no IO in
* progress.
*/
if (xfs_inode_clean(ip)) {
xfs_ifunlock(ip);
error = 0;
goto out_unlock;
tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
if (error) {
xfs_trans_cancel(tp, 0);
goto trouble;
}
error = xfs_iflush(ip, SYNC_TRYLOCK);
}
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_SHARED);
out:
xfs_ilock(ip, XFS_ILOCK_EXCL);
/*
* if we failed to write out the inode then mark
* it dirty again so we'll try again later.
* Grab all the latest timestamps from the Linux inode.
*/
ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
ip->i_d.di_ctime.t_sec = (__int32_t)inode->i_ctime.tv_sec;
ip->i_d.di_ctime.t_nsec = (__int32_t)inode->i_ctime.tv_nsec;
ip->i_d.di_mtime.t_sec = (__int32_t)inode->i_mtime.tv_sec;
ip->i_d.di_mtime.t_nsec = (__int32_t)inode->i_mtime.tv_nsec;
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_trans_commit(tp, 0);
if (error)
xfs_mark_inode_dirty_sync(ip);
return -error;
goto trouble;
return;
trouble:
xfs_warn(mp, "failed to update timestamps for inode 0x%llx", ip->i_ino);
}
STATIC void
@ -1466,7 +1433,6 @@ static const struct super_operations xfs_super_operations = {
.alloc_inode = xfs_fs_alloc_inode,
.destroy_inode = xfs_fs_destroy_inode,
.dirty_inode = xfs_fs_dirty_inode,
.write_inode = xfs_fs_write_inode,
.evict_inode = xfs_fs_evict_inode,
.put_super = xfs_fs_put_super,
.sync_fs = xfs_fs_sync_fs,

36
fs/xfs/xfs_sync.c
View File

@ -336,32 +336,6 @@ xfs_sync_fsdata(
return error;
}
int
xfs_log_dirty_inode(
struct xfs_inode *ip,
struct xfs_perag *pag,
int flags)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
int error;
if (!ip->i_update_core)
return 0;
tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
if (error) {
xfs_trans_cancel(tp, 0);
return error;
}
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
return xfs_trans_commit(tp, 0);
}
/*
* When remounting a filesystem read-only or freezing the filesystem, we have
* two phases to execute. This first phase is syncing the data before we
@ -385,16 +359,6 @@ xfs_quiesce_data(
{
int error, error2 = 0;
/*
* Log all pending size and timestamp updates. The vfs writeback
* code is supposed to do this, but due to its overagressive
* livelock detection it will skip inodes where appending writes
* were written out in the first non-blocking sync phase if their
* completion took long enough that it happened after taking the
* timestamp for the cut-off in the blocking phase.
*/
xfs_inode_ag_iterator(mp, xfs_log_dirty_inode, 0);
/* force out the log */
xfs_log_force(mp, XFS_LOG_SYNC);

2
fs/xfs/xfs_sync.h
View File

@ -34,8 +34,6 @@ void xfs_quiesce_attr(struct xfs_mount *mp);
void xfs_flush_inodes(struct xfs_inode *ip);
int xfs_log_dirty_inode(struct xfs_inode *ip, struct xfs_perag *pag, int flags);
int xfs_reclaim_inodes(struct xfs_mount *mp, int mode);
int xfs_reclaim_inodes_count(struct xfs_mount *mp);
void xfs_reclaim_inodes_nr(struct xfs_mount *mp, int nr_to_scan);

2
fs/xfs/xfs_trace.h
View File

@ -580,7 +580,7 @@ DEFINE_INODE_EVENT(xfs_ioctl_setattr);
DEFINE_INODE_EVENT(xfs_dir_fsync);
DEFINE_INODE_EVENT(xfs_file_fsync);
DEFINE_INODE_EVENT(xfs_destroy_inode);
DEFINE_INODE_EVENT(xfs_write_inode);
DEFINE_INODE_EVENT(xfs_dirty_inode);
DEFINE_INODE_EVENT(xfs_evict_inode);
DEFINE_INODE_EVENT(xfs_dquot_dqalloc);

4
fs/xfs/xfs_trans_inode.c
View File

@ -95,10 +95,14 @@ xfs_trans_ichgtime(
if ((flags & XFS_ICHGTIME_MOD) &&
!timespec_equal(&inode->i_mtime, &tv)) {
inode->i_mtime = tv;
ip->i_d.di_mtime.t_sec = tv.tv_sec;
ip->i_d.di_mtime.t_nsec = tv.tv_nsec;
}
if ((flags & XFS_ICHGTIME_CHG) &&
!timespec_equal(&inode->i_ctime, &tv)) {
inode->i_ctime = tv;
ip->i_d.di_ctime.t_sec = tv.tv_sec;
ip->i_d.di_ctime.t_nsec = tv.tv_nsec;
}
}