svn commit: r286556 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Alexander Motin]

Author: mav
Date: Sun Aug  9 20:41:44 2015
New Revision: 286556
URL: https://svnweb.freebsd.org/changeset/base/286556

Log:
  MFV 286555: Avoid 128K kmem allocations in mzap_upgrade()
  
  Reviewed by: Matthew Ahrens <mahrens at delphix.com>
  Reviewed by: Prakash Surya <prakash.surya at delphix.com>
  Reviewed by: George Wilson <george at delphix.com>
  Reviewed by: Steven Hartland <killing at multiplay.co.uk>
  Approved by: Rich Lowe <richlowe at richlowe.net>
  
  illumos/illumos-gate at be3e2ab906b80af79c7b22885f279e45ad8fb995

Modified:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zap_micro.c

Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zap_micro.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zap_micro.c	Sun Aug  9 20:41:23 2015	(r286555)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zap_micro.c	Sun Aug  9 20:41:44 2015	(r286556)
@@ -547,7 +547,7 @@ mzap_upgrade(zap_t **zapp, dmu_tx_t *tx,
 	ASSERT(RW_WRITE_HELD(&zap->zap_rwlock));
 
 	sz = zap->zap_dbuf->db_size;
-	mzp = kmem_alloc(sz, KM_SLEEP);
+	mzp = zio_buf_alloc(sz);
 	bcopy(zap->zap_dbuf->db_data, mzp, sz);
 	nchunks = zap->zap_m.zap_num_chunks;
 
@@ -555,7 +555,7 @@ mzap_upgrade(zap_t **zapp, dmu_tx_t *tx,
 		err = dmu_object_set_blocksize(zap->zap_objset, zap->zap_object,
 		    1ULL << fzap_default_block_shift, 0, tx);
 		if (err) {
-			kmem_free(mzp, sz);
+			zio_buf_free(mzp, sz);
 			return (err);
 		}
 	}
@@ -581,7 +581,7 @@ mzap_upgrade(zap_t **zapp, dmu_tx_t *tx,
 		if (err)
 			break;
 	}
-	kmem_free(mzp, sz);
+	zio_buf_free(mzp, sz);
 	*zapp = zap;
 	return (err);
 }