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MFV r302649: 7016 arc_available_memory is not 32-bit safe

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illumos/illumos-gate@0dd053d7d8
0dd053d7d8

https://www.illumos.org/issues/7016
  upstream DLPX-39446 arc_available_memory is not 32-bit safe
  https://github.com/delphix/delphix-os/commit/
  6b353ea3b8a1610be22e71e657d051743c64190b
  related to this upstream:
  DLPX-38547 delphix engine hang
  https://github.com/delphix/delphix-os/commit/
  3183a567b3e8c62a74a65885ca60c86f3d693783
  DLPX-38547 delphix engine hang (fix static global)
  https://github.com/delphix/delphix-os/commit/
  22ac551d8ef085ad66cc8f65e51ac372b12993b9
  DLPX-38882 system hung waiting on free segment
  https://github.com/delphix/delphix-os/commit/
  cdd6beef7548cd3b12f0fc0328eeb3af540079c2

Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Gordon Ross <gordon.ross@nexenta.com>
Author: Prakash Surya <prakash.surya@delphix.com>
This commit is contained in:
Alexander Motin 2018-02-20 04:14:12 +00:00
commit 4a0867c8d2
1 changed files with 11 additions and 5 deletions
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16
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -349,6 +349,11 @@ extern boolean_t zfs_prefetch_disable;
*/
static boolean_t arc_warm;
/*
* log2 fraction of the zio arena to keep free.
*/
int arc_zio_arena_free_shift = 2;
/*
* These tunables are for performance analysis.
*/
@ -4321,15 +4326,16 @@ arc_available_memory(void)
/*
* If zio data pages are being allocated out of a separate heap segment,
* then enforce that the size of available vmem for this arena remains
* above about 1/16th free.
* above about 1/4th (1/(2^arc_zio_arena_free_shift)) free.
*
* Note: The 1/16th arena free requirement was put in place
* to aggressively evict memory from the arc in order to avoid
* memory fragmentation issues.
* Note that reducing the arc_zio_arena_free_shift keeps more virtual
* memory (in the zio_arena) free, which can avoid memory
* fragmentation issues.
*/
if (zio_arena != NULL) {
n = (int64_t)vmem_size(zio_arena, VMEM_FREE) -
(vmem_size(zio_arena, VMEM_ALLOC) >> 4);
(vmem_size(zio_arena, VMEM_ALLOC) >>
arc_zio_arena_free_shift);
if (n < lowest) {
lowest = n;
r = FMR_ZIO_ARENA;