OpenZFS 7303 - dynamic metaslab selection

This change introduces a new weighting algorithm to improve
metaslab selection. The new weighting algorithm relies on the
SPACEMAP_HISTOGRAM feature. As a result, the metaslab weight
now encodes the type of weighting algorithm used (size-based
vs segment-based).

Porting Notes: The metaslab allocation tracing code is conditionally
removed on linux (dependent on mdb debugger).

Authored by: George Wilson <[email protected]>
Reviewed by: Alex Reece <[email protected]>
Reviewed by: Chris Siden <[email protected]>
Reviewed by: Dan Kimmel <[email protected]>
Reviewed by: Matthew Ahrens <[email protected]>
Reviewed by: Paul Dagnelie <[email protected]>
Reviewed by: Pavel Zakharov [email protected]
Reviewed by: Prakash Surya <[email protected]>
Reviewed by: Don Brady <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Ported-by: Don Brady <[email protected]>

OpenZFS-issue: https://www.illumos.org/issues/7303
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/d5190931bd
Closes #5404 

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sys/zfs_context.h b/include/sys/zfs_context.h
index a1abe20da..6e950716c 100644
--- a/include/sys/zfs_context.h
+++ b/include/sys/zfs_context.h
@@ -394,6 +394,7 @@ extern void cv_broadcast(kcondvar_t *cv);
  */
 extern kstat_t *kstat_create(const char *, int,
     const char *, const char *, uchar_t, ulong_t, uchar_t);
+extern void kstat_named_init(kstat_named_t *, const char *, uchar_t);
 extern void kstat_install(kstat_t *);
 extern void kstat_delete(kstat_t *);
 extern void kstat_waitq_enter(kstat_io_t *);