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ext4: add prefetch_block_bitmaps mount option

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For file systems where we can afford to keep the buddy bitmaps cached,
we can speed up initial writes to large file systems by starting to
load the block allocation bitmaps as soon as the file system is
mounted.  This won't work well for _super_ large file systems, or
memory constrained systems, so we only enable this when it is
requested via a mount option.

Addresses-Google-Bug: 159488342
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
This commit is contained in:
Theodore Ts'o
2020-07-17 00:14:40 -04:00
parent ab74c7b23f
commit 3d392b2676
4 changed files with 103 additions and 23 deletions
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44
include/trace/events/ext4.h
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@@ -2742,6 +2742,50 @@ TRACE_EVENT(ext4_error,
__entry->function, __entry->line)
);
TRACE_EVENT(ext4_prefetch_bitmaps,
TP_PROTO(struct super_block *sb, ext4_group_t group,
ext4_group_t next, unsigned int prefetch_ios),
TP_ARGS(sb, group, next, prefetch_ios),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( __u32, group )
__field( __u32, next )
__field( __u32, ios )
),
TP_fast_assign(
__entry->dev = sb->s_dev;
__entry->group = group;
__entry->next = next;
__entry->ios = prefetch_ios;
),
TP_printk("dev %d,%d group %u next %u ios %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->group, __entry->next, __entry->ios)
);
TRACE_EVENT(ext4_lazy_itable_init,
TP_PROTO(struct super_block *sb, ext4_group_t group),
TP_ARGS(sb, group),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( __u32, group )
),
TP_fast_assign(
__entry->dev = sb->s_dev;
__entry->group = group;
),
TP_printk("dev %d,%d group %u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->group)
);
#endif /* _TRACE_EXT4_H */
/* This part must be outside protection */