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Fast Clone Deletion

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Deleting a clone requires finding blocks are clone-only, not shared
with the snapshot. This was done by traversing the entire block tree
which results in a large performance penalty for sparsely
written clones.

This is new method keeps track of clone blocks when they are
modified in a "Livelist" so that, when it’s time to delete,
the clone-specific blocks are already at hand.

We see performance improvements because now deletion work is
proportional to the number of clone-modified blocks, not the size
of the original dataset.

Reviewed-by: Sean Eric Fagan <sef@ixsystems.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Signed-off-by: Sara Hartse <sara.hartse@delphix.com>
Closes #8416
This commit is contained in:
Sara Hartse
2019-07-26 10:54:14 -07:00
committed by Brian Behlendorf
parent d274ac5460
commit 37f03da8ba
38 changed files with 2583 additions and 205 deletions
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include/sys/zthr.h
+2
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@@ -33,7 +33,9 @@ extern void zthr_destroy(zthr_t *t);
extern void zthr_wakeup(zthr_t *t);
extern void zthr_cancel(zthr_t *t);
extern void zthr_resume(zthr_t *t);
extern void zthr_wait_cycle_done(zthr_t *t);
extern boolean_t zthr_iscancelled(zthr_t *t);
extern boolean_t zthr_has_waiters(zthr_t *t);
#endif /* _SYS_ZTHR_H */