[Devel] [PATCH rh7 0/3] ext4: speedup shrinking non-delay extents

[Dmitry Monakhov]

Konstantin Khorenko <khorenko at virtuozzo.com> writes:

> We faced a situation when all (32) cpus on a node content on sbi->s_es_lock
> shrinking extents on a single superblock and
> shrinking extents goes very slow (180 sec in average!).
>
> crash> struct ext4_sb_info 0xffff882fcb7ca800 -p
>
>   s_es_nr_inode = 3173832,
>   s_es_stats = {
>     es_stats_shrunk = 70,
>     es_stats_cache_hits = 35182748,
>     es_stats_cache_misses = 2622931,
>     es_stats_scan_time = 182642303461,
>     es_stats_max_scan_time = 276290979674,
>
> This patchset speeds up parallel shrink a bit.
> If we findout this is not enough, next step is to limit the number of shrinkers
> working on a single superslock in parallel.
>
> https://jira.sw.ru/browse/PSBM-83335
>
> Jan Kara (1):
>   ms/ext4: move handling of list of shrinkable inodes into extent status
>     code
>
> Konstantin Khorenko (1):
>   ext4: don't iterate over sbi->s_es_list more than the number of
>     elements
>
> Waiman Long (1):
>   ext4: Make cache hits/misses per-cpu counts
ACK.
>
>  fs/ext4/extents.c        |  2 --
>  fs/ext4/extents_status.c | 56 +++++++++++++++++++++++++++++++++++++-----------
>  fs/ext4/extents_status.h |  6 ++----
>  fs/ext4/inode.c          |  2 --
>  fs/ext4/ioctl.c          |  2 --
>  fs/ext4/super.c          |  1 -
>  6 files changed, 45 insertions(+), 24 deletions(-)
>
> -- 
> 2.15.1
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