On Aug 15, 2020, at 7:32 AM, Ritesh Harjani <riteshh@xxxxxxxxxxxxx> wrote:
>
>
>
> On 8/7/20 2:14 PM, brookxu wrote:
>> In the scenario of writing sparse files, the Per-inode prealloc list may
>> be very long, resulting in high overhead for ext4_mb_use_preallocated().
>> To circumvent this problem, we limit the maximum length of per-inode
>> prealloc list to 512 and allow users to modify it.
>
> ok, so I looked at your algorithm again, below are few comments.
>
> @Andreas, please let me also know if you agree?
>
>
> 1. On every block allocation request in ext4_mb_new_blocks()
> you call for ext4_mb_trim_inode_pa() just to iterate over all the ei->prealloc_list to count the length of this list.
> This looks a costly and also since it uses the spin_lock()/unlock()
> (of pa->lock) for every pa in that list just to see if it's getting deleted.
> So if someone else in parallel is also allocating/freeing blocks from
> that pa, this could cause contention just to measure the length of list.
> I think maybe the better way would be to maintain an atomic counter
> instead of traversing the list every time. thoughts?
You are totally correct. Definitely, walking the list to count how many
entries are present is very expensive and should be avoided.
> 2. In ext4_mb_release_context(), I think for LRU algo, we should be doing it like below. Thoughts?
>
> list_move(&pa->pa_inode_list, &ei->i_prealloc_list);
Right, the declaration for list_move() is:
/**
* list_move - delete from one list and add as another's head
* @list: the entry to move
* @head: the head that will precede our entry
*/
static inline void list_move(struct list_head *list, struct list_head *head)
{
__list_del_entry(list);
list_add(list, head);
}
so the pa entry should be the first argument, and the inode list head second.
Ritesh, thanks for the thorough review.
Cheers, Andreas
> With your change I observe below behavior, and I think this is not
> intended right?
>
> <with your change i.e. list_move(&ei->i_prealloc_list, &pa->pa_inode_list)>
> ======================================================================
> #/run/perf# sudo perf script
> a.out 5453 [000] 55399.979084: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde4008
> a.out 5453 [000] 55405.213401: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde47e8
> a.out 5453 [000] 55415.669280: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde4bd8
> a.out 5453 [000] 55420.840979: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde43f8
> a.out 5453 [000] 55420.841064: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff8889ebde4bd8
> a.out 5453 [000] 55420.841082: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff8889ebde43f8
> a.out 5453 [000] 55420.841280: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde4200
> a.out 5453 [000] 55426.030955: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde43f8
> a.out 5453 [000] 55426.031060: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff8889ebde4200
> a.out 5453 [000] 55426.031076: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff8889ebde43f8
> a.out 5453 [000] 55426.031334: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde49e0
> a.out 5453 [000] 55431.279519: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff8889ebde43f8
> a.out 5453 [000] 55431.279809: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff8889ebde49e0
> a.out 5453 [000] 55431.279831: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff8889ebde43f8
>
>
>
> <with list_move(&pa->pa_inode_list, &ei->i_prealloc_list)>
> ======================================================================
> root@qemu:/run/perf# sudo perf script
> a.out 1646 [000] 1555.975990: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fab008
> a.out 1646 [000] 1563.509005: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fab7e8
> a.out 1646 [000] 1568.742938: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fabdd0
> a.out 1646 [000] 1573.932029: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fab5f0
> a.out 1646 [000] 1573.932143: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff888977fab7e8
> a.out 1646 [000] 1573.932161: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff888977fab008
> a.out 1646 [000] 1579.289937: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fab008
> a.out 1646 [000] 1584.561934: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fab9e0
> a.out 1646 [000] 1584.562019: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff888977fab5f0
> a.out 1646 [000] 1584.562037: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff888977fabdd0
> a.out 1646 [000] 1589.822954: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fabdd0
> a.out 1646 [000] 1595.006822: probe:ext4_mb_new_inode_pa: (ffffffff813c51c0) i_ino=0xe ac_pa=0xffff888977fab7e8
> a.out 1646 [000] 1595.006880: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff888977fab9e0
> a.out 1646 [000] 1595.006892: probe:ext4_discard_preallocations_L99: (ffffffff813ce34b) i_ino=0xe pa=0xffff888977fab008
>
>
>
> -ritesh
>
>
>
>
>> After patching, we observed that the sys ratio of cpu has dropped, and
>> the system throughput has increased significantly. We created a process
>> to write the sparse file, and the running time of the process on the
>> fixed kernel was significantly reduced, as follows:
>> Running time on unfixed kernel：
>> [root@TENCENT64 ~]# time taskset 0x01 ./sparse /data1/sparce.dat
>> real 0m2.051s
>> user 0m0.008s
>> sys 0m2.026s
>> Running time on fixed kernel：
>> [root@TENCENT64 ~]# time taskset 0x01 ./sparse /data1/sparce.dat
>> real 0m0.471s
>> user 0m0.004s
>> sys 0m0.395s
>> Signed-off-by: Chunguang Xu <brookxu@xxxxxxxxxxx>
>> ---
>> fs/ext4/ext4.h | 3 ++-
>> fs/ext4/extents.c | 10 ++++----
>> fs/ext4/file.c | 2 +-
>> fs/ext4/indirect.c | 2 +-
>> fs/ext4/inode.c | 6 ++---
>> fs/ext4/ioctl.c | 2 +-
>> fs/ext4/mballoc.c | 57 +++++++++++++++++++++++++++++++++++++++++----
>> fs/ext4/mballoc.h | 4 ++++
>> fs/ext4/move_extent.c | 4 ++--
>> fs/ext4/super.c | 2 +-
>> fs/ext4/sysfs.c | 2 ++
>> include/trace/events/ext4.h | 14 ++++++-----
>> 12 files changed, 83 insertions(+), 25 deletions(-)
>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
>> index 42f5060..68e0ebe 100644
>> --- a/fs/ext4/ext4.h
>> +++ b/fs/ext4/ext4.h
>> @@ -1501,6 +1501,7 @@ struct ext4_sb_info {
>> unsigned int s_mb_stats;
>> unsigned int s_mb_order2_reqs;
>> unsigned int s_mb_group_prealloc;
>> + unsigned int s_mb_max_inode_prealloc;
>> unsigned int s_max_dir_size_kb;
>> /* where last allocation was done - for stream allocation */
>> unsigned long s_mb_last_group;
>> @@ -2651,7 +2652,7 @@ extern int ext4_init_inode_table(struct super_block *sb,
>> extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
>> struct ext4_allocation_request *, int *);
>> extern int ext4_mb_reserve_blocks(struct super_block *, int);
>> -extern void ext4_discard_preallocations(struct inode *);
>> +extern void ext4_discard_preallocations(struct inode *, unsigned int);
>> extern int __init ext4_init_mballoc(void);
>> extern void ext4_exit_mballoc(void);
>> extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
>> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
>> index 221f240..a40f928 100644
>> --- a/fs/ext4/extents.c
>> +++ b/fs/ext4/extents.c
>> @@ -100,7 +100,7 @@ static int ext4_ext_trunc_restart_fn(struct inode *inode, int *dropped)
>> * i_mutex. So we can safely drop the i_data_sem here.
>> */
>> BUG_ON(EXT4_JOURNAL(inode) == NULL);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> up_write(&EXT4_I(inode)->i_data_sem);
>> *dropped = 1;
>> return 0;
>> @@ -4272,7 +4272,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
>> * not a good idea to call discard here directly,
>> * but otherwise we'd need to call it every free().
>> */
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
>> fb_flags = EXT4_FREE_BLOCKS_NO_QUOT_UPDATE;
>> ext4_free_blocks(handle, inode, NULL, newblock,
>> @@ -5299,7 +5299,7 @@ static int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
>> }
>> down_write(&EXT4_I(inode)->i_data_sem);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> ret = ext4_es_remove_extent(inode, punch_start,
>> EXT_MAX_BLOCKS - punch_start);
>> @@ -5313,7 +5313,7 @@ static int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
>> up_write(&EXT4_I(inode)->i_data_sem);
>> goto out_stop;
>> }
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> ret = ext4_ext_shift_extents(inode, handle, punch_stop,
>> punch_stop - punch_start, SHIFT_LEFT);
>> @@ -5445,7 +5445,7 @@ static int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len)
>> goto out_stop;
>> down_write(&EXT4_I(inode)->i_data_sem);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> path = ext4_find_extent(inode, offset_lblk, NULL, 0);
>> if (IS_ERR(path)) {
>> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
>> index 2a01e31..e3ab8ea 100644
>> --- a/fs/ext4/file.c
>> +++ b/fs/ext4/file.c
>> @@ -148,7 +148,7 @@ static int ext4_release_file(struct inode *inode, struct file *filp)
>> !EXT4_I(inode)->i_reserved_data_blocks)
>> {
>> down_write(&EXT4_I(inode)->i_data_sem);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> up_write(&EXT4_I(inode)->i_data_sem);
>> }
>> if (is_dx(inode) && filp->private_data)
>> diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
>> index be2b66e..ec6b930 100644
>> --- a/fs/ext4/indirect.c
>> +++ b/fs/ext4/indirect.c
>> @@ -696,7 +696,7 @@ static int ext4_ind_trunc_restart_fn(handle_t *handle, struct inode *inode,
>> * i_mutex. So we can safely drop the i_data_sem here.
>> */
>> BUG_ON(EXT4_JOURNAL(inode) == NULL);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> up_write(&EXT4_I(inode)->i_data_sem);
>> *dropped = 1;
>> return 0;
>> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
>> index 10dd470..bb9e1cd 100644
>> --- a/fs/ext4/inode.c
>> +++ b/fs/ext4/inode.c
>> @@ -383,7 +383,7 @@ void ext4_da_update_reserve_space(struct inode *inode,
>> */
>> if ((ei->i_reserved_data_blocks == 0) &&
>> !inode_is_open_for_write(inode))
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> }
>> static int __check_block_validity(struct inode *inode, const char *func,
>> @@ -4056,7 +4056,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length)
>> if (stop_block > first_block) {
>> down_write(&EXT4_I(inode)->i_data_sem);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> ret = ext4_es_remove_extent(inode, first_block,
>> stop_block - first_block);
>> @@ -4211,7 +4211,7 @@ int ext4_truncate(struct inode *inode)
>> down_write(&EXT4_I(inode)->i_data_sem);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
>> err = ext4_ext_truncate(handle, inode);
>> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
>> index 999cf6a..a5fcc23 100644
>> --- a/fs/ext4/ioctl.c
>> +++ b/fs/ext4/ioctl.c
>> @@ -202,7 +202,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
>> reset_inode_seed(inode);
>> reset_inode_seed(inode_bl);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> err = ext4_mark_inode_dirty(handle, inode);
>> if (err < 0) {
>> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
>> index 4f21f34..28a139f 100644
>> --- a/fs/ext4/mballoc.c
>> +++ b/fs/ext4/mballoc.c
>> @@ -2736,6 +2736,7 @@ int ext4_mb_init(struct super_block *sb)
>> sbi->s_mb_stats = MB_DEFAULT_STATS;
>> sbi->s_mb_stream_request = MB_DEFAULT_STREAM_THRESHOLD;
>> sbi->s_mb_order2_reqs = MB_DEFAULT_ORDER2_REQS;
>> + sbi->s_mb_max_inode_prealloc = MB_DEFAULT_MAX_INODE_PREALLOC;
>> /*
>> * The default group preallocation is 512, which for 4k block
>> * sizes translates to 2 megabytes. However for bigalloc file
>> @@ -4103,7 +4104,7 @@ static void ext4_mb_new_preallocation(struct ext4_allocation_context *ac)
>> *
>> * FIXME!! Make sure it is valid at all the call sites
>> */
>> -void ext4_discard_preallocations(struct inode *inode)
>> +void ext4_discard_preallocations(struct inode *inode, unsigned int needed)
>> {
>> struct ext4_inode_info *ei = EXT4_I(inode);
>> struct super_block *sb = inode->i_sb;
>> @@ -4121,15 +4122,18 @@ void ext4_discard_preallocations(struct inode *inode)
>> mb_debug(sb, "discard preallocation for inode %lu\n",
>> inode->i_ino);
>> - trace_ext4_discard_preallocations(inode);
>> + trace_ext4_discard_preallocations(inode, needed);
>> INIT_LIST_HEAD(&list);
>> + if (needed == 0)
>> + needed = UINT_MAX;
>> +
>> repeat:
>> /* first, collect all pa's in the inode */
>> spin_lock(&ei->i_prealloc_lock);
>> - while (!list_empty(&ei->i_prealloc_list)) {
>> - pa = list_entry(ei->i_prealloc_list.next,
>> + while (!list_empty(&ei->i_prealloc_list) && needed) {
>> + pa = list_entry(ei->i_prealloc_list.prev,
>> struct ext4_prealloc_space, pa_inode_list);
>> BUG_ON(pa->pa_obj_lock != &ei->i_prealloc_lock);
>> spin_lock(&pa->pa_lock);
>> @@ -4150,6 +4154,7 @@ void ext4_discard_preallocations(struct inode *inode)
>> spin_unlock(&pa->pa_lock);
>> list_del_rcu(&pa->pa_inode_list);
>> list_add(&pa->u.pa_tmp_list, &list);
>> + needed--;
>> continue;
>> }
>> @@ -4549,10 +4554,42 @@ static void ext4_mb_add_n_trim(struct ext4_allocation_context *ac)
>> }
>> /*
>> + * if per-inode prealloc list is too long, trim some PA
>> + */
>> +static void
>> +ext4_mb_trim_inode_pa(struct inode *inode)
>> +{
>> + struct ext4_inode_info *ei = EXT4_I(inode);
>> + struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
>> + struct ext4_prealloc_space *pa;
>> + int count = 0, delta;
>> +
>> + rcu_read_lock();
>> + list_for_each_entry_rcu(pa, &ei->i_prealloc_list, pa_inode_list) {
>> + spin_lock(&pa->pa_lock);
>> + if (pa->pa_deleted) {
>> + spin_unlock(&pa->pa_lock);
>> + continue;
>> + }
>> + count++;
>> + spin_unlock(&pa->pa_lock);
>> + }
>> + rcu_read_unlock();
>> +
>> + delta = (sbi->s_mb_max_inode_prealloc >> 2) + 1;
>> + if (count > sbi->s_mb_max_inode_prealloc + delta) {
>> + count -= sbi->s_mb_max_inode_prealloc;
>> + ext4_discard_preallocations(inode, count);
>> + }
>> +}
>> +
>> +/*
>> * release all resource we used in allocation
>> */
>> static int ext4_mb_release_context(struct ext4_allocation_context *ac)
>> {
>> + struct inode *inode = ac->ac_inode;
>> + struct ext4_inode_info *ei = EXT4_I(inode);
>> struct ext4_sb_info *sbi = EXT4_SB(ac->ac_sb);
>> struct ext4_prealloc_space *pa = ac->ac_pa;
>> if (pa) {
>> @@ -4578,6 +4615,17 @@ static int ext4_mb_release_context(struct ext4_allocation_context *ac)
>> ext4_mb_add_n_trim(ac);
>> }
>> }
>> +
>> + if (pa->pa_type == MB_INODE_PA) {
>> + /*
>> + * treat per-inode prealloc list as a lru list, then try
>> + * to trim the least recently used PA.
>> + */
>> + spin_lock(pa->pa_obj_lock);
>> + list_move(&ei->i_prealloc_list, &pa->pa_inode_list);
>> + spin_unlock(pa->pa_obj_lock);
>> + }
>> +
>> ext4_mb_put_pa(ac, ac->ac_sb, pa);
>> }
>> if (ac->ac_bitmap_page)
>> @@ -4587,6 +4635,7 @@ static int ext4_mb_release_context(struct ext4_allocation_context *ac)
>> if (ac->ac_flags & EXT4_MB_HINT_GROUP_ALLOC)
>> mutex_unlock(&ac->ac_lg->lg_mutex);
>> ext4_mb_collect_stats(ac);
>> + ext4_mb_trim_inode_pa(inode);
>> return 0;
>> }
>> diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
>> index 6b4d17c..e75b474 100644
>> --- a/fs/ext4/mballoc.h
>> +++ b/fs/ext4/mballoc.h
>> @@ -73,6 +73,10 @@
>> */
>> #define MB_DEFAULT_GROUP_PREALLOC 512
>> +/*
>> + * maximum length of inode prealloc list
>> + */
>> +#define MB_DEFAULT_MAX_INODE_PREALLOC 512
>> struct ext4_free_data {
>> /* this links the free block information from sb_info */
>> diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
>> index 1ed86fb..0d601b8 100644
>> --- a/fs/ext4/move_extent.c
>> +++ b/fs/ext4/move_extent.c
>> @@ -686,8 +686,8 @@
>> out:
>> if (*moved_len) {
>> - ext4_discard_preallocations(orig_inode);
>> - ext4_discard_preallocations(donor_inode);
>> + ext4_discard_preallocations(orig_inode, 0);
>> + ext4_discard_preallocations(donor_inode, 0);
>> }
>> ext4_ext_drop_refs(path);
>> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
>> index 330957e..8ce61f3 100644
>> --- a/fs/ext4/super.c
>> +++ b/fs/ext4/super.c
>> @@ -1216,7 +1216,7 @@ void ext4_clear_inode(struct inode *inode)
>> {
>> invalidate_inode_buffers(inode);
>> clear_inode(inode);
>> - ext4_discard_preallocations(inode);
>> + ext4_discard_preallocations(inode, 0);
>> ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
>> dquot_drop(inode);
>> if (EXT4_I(inode)->jinode) {
>> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
>> index 6c9fc9e..92f04e9 100644
>> --- a/fs/ext4/sysfs.c
>> +++ b/fs/ext4/sysfs.c
>> @@ -215,6 +215,7 @@ static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
>> EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
>> EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
>> EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
>> +EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc);
>> EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
>> EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
>> EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
>> @@ -257,6 +258,7 @@ static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
>> ATTR_LIST(mb_order2_req),
>> ATTR_LIST(mb_stream_req),
>> ATTR_LIST(mb_group_prealloc),
>> + ATTR_LIST(mb_max_inode_prealloc),
>> ATTR_LIST(max_writeback_mb_bump),
>> ATTR_LIST(extent_max_zeroout_kb),
>> ATTR_LIST(trigger_fs_error),
>> diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
>> index cc41d69..61736d8 100644
>> --- a/include/trace/events/ext4.h
>> +++ b/include/trace/events/ext4.h
>> @@ -746,24 +746,26 @@
>> );
>> TRACE_EVENT(ext4_discard_preallocations,
>> - TP_PROTO(struct inode *inode),
>> + TP_PROTO(struct inode *inode, unsigned int needed),
>> - TP_ARGS(inode),
>> + TP_ARGS(inode, needed),
>> TP_STRUCT__entry(
>> - __field( dev_t, dev )
>> - __field( ino_t, ino )
>> + __field( dev_t, dev )
>> + __field( ino_t, ino )
>> + __field( unsigned int, needed )
>> ),
>> TP_fast_assign(
>> __entry->dev = inode->i_sb->s_dev;
>> __entry->ino = inode->i_ino;
>> + __entry->needed = needed;
>> ),
>> - TP_printk("dev %d,%d ino %lu",
>> + TP_printk("dev %d,%d ino %lu needed %u",
>> MAJOR(__entry->dev), MINOR(__entry->dev),
>> - (unsigned long) __entry->ino)
>> + (unsigned long) __entry->ino, __entry->needed)
>> );
>> TRACE_EVENT(ext4_mb_discard_preallocations,
Cheers, Andreas
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