From f0882293abab53b447ecd49ce97c8200e69c03b2 Mon Sep 17 00:00:00 2001 From: mav Date: Wed, 26 Jul 2017 16:14:05 +0000 Subject: MFC r315896: MFV r315290, r315291: 7303 dynamic metaslab selection illumos/illumos-gate@8363e80ae72609660f6090766ca8c2c18aa53f0c https://github.com/illumos/illumos-gate/commit/8363e80ae72609660f6090766ca8c2c18 https://www.illumos.org/issues/7303 This change introduces a new weighting algorithm to improve metaslab selection . The new weighting algorithm relies on the SPACEMAP_HISTOGRAM feature. As a res ult, the metaslab weight now encodes the type of weighting algorithm used (size-based vs segment-based). This also introduce a new allocation tracing facility and two new dcmds to hel p debug allocation problems. Each zio now contains a zio_alloc_list_t structure that is populated as the zio goes through the allocations stage. Here's an example of how to use the tracing facility: > c5ec000::print zio_t io_alloc_list | ::walk list | ::metaslab_trace MSID DVA ASIZE WEIGHT RESULT VDEV - 0 400 0 NOT_ALLOCATABLE ztest.0a - 0 400 0 NOT_ALLOCATABLE ztest.0a - 0 400 0 ENOSPC ztest.0a - 0 200 0 NOT_ALLOCATABLE ztest.0a - 0 200 0 NOT_ALLOCATABLE ztest.0a - 0 200 0 ENOSPC ztest.0a 1 0 400 1 x 8M 17b1a00 ztest.0a > 1ff2400::print zio_t io_alloc_list | ::walk list | ::metaslab_trace MSID DVA ASIZE WEIGHT RESULT VDEV - 0 200 0 NOT_ALLOCATABLE mirror-2 - 0 200 0 NOT_ALLOCATABLE mirror-0 1 0 200 1 x 4M 112ae00 mirror-1 - 1 200 0 NOT_ALLOCATABLE mirror-2 - 1 200 0 NOT_ALLOCATABLE mirror-0 1 1 200 1 x 4M 112b000 mirror-1 - 2 200 0 NOT_ALLOCATABLE mirror-2 If the metaslab is using segment-based weighting then the WEIGHT column will display the number of segments available in the bucket where the allocation attempt was made. Author: George Wilson Reviewed by: Alex Reece Reviewed by: Chris Siden Reviewed by: Dan Kimmel Reviewed by: Matthew Ahrens Reviewed by: Paul Dagnelie Reviewed by: Pavel Zakharov Reviewed by: Prakash Surya Reviewed by: Don Brady Approved by: Richard Lowe --- cddl/contrib/opensolaris/lib/libzpool/common/kernel.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'cddl/contrib/opensolaris/lib/libzpool/common/kernel.c') diff --git a/cddl/contrib/opensolaris/lib/libzpool/common/kernel.c b/cddl/contrib/opensolaris/lib/libzpool/common/kernel.c index a7fc128..701f0b4 100644 --- a/cddl/contrib/opensolaris/lib/libzpool/common/kernel.c +++ b/cddl/contrib/opensolaris/lib/libzpool/common/kernel.c @@ -97,6 +97,11 @@ kstat_create(char *module, int instance, char *name, char *class, /*ARGSUSED*/ void +kstat_named_init(kstat_named_t *knp, const char *name, uchar_t type) +{} + +/*ARGSUSED*/ +void kstat_install(kstat_t *ksp) {} -- cgit v1.1