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3.12 compat, NUMA-aware per-superblock shrinker 

Kernels >= 3.12 have a NUMA-aware superblock shrinker which is used in
ZoL by zfs_sb_prune().  This patch calls the shrinker for each on-line
NUMA node in order that memory be freed for each one.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3495
This commit is contained in:
Tim Chase 2015-06-14 11:19:40 -05:00 committed by Brian Behlendorf
parent 410921241d
commit 90947b2357
3 changed files with 34 additions and 2 deletions
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22
config/kernel-shrink.m4
View File

@ -109,3 +109,25 @@ AC_DEFUN([ZFS_AC_KERNEL_FREE_CACHED_OBJECTS], [
AC_MSG_RESULT(no)
])
])
dnl #
dnl # 3.12 API change
dnl # The nid member was added to struct shrink_control to support
dnl # NUMA-aware shrinkers.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID], [
AC_MSG_CHECKING([whether shrink_control has nid])
ZFS_LINUX_TRY_COMPILE([
#include <linux/fs.h>
],[
struct shrink_control sc __attribute__ ((unused));
unsigned long scnidsize __attribute__ ((unused)) =
sizeof(sc.nid);
],[
AC_MSG_RESULT(yes)
AC_DEFINE(SHRINK_CONTROL_HAS_NID, 1,
[struct shrink_control has nid])
],[
AC_MSG_RESULT(no)
])
])

1
config/kernel.m4
View File

@ -87,6 +87,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
ZFS_AC_KERNEL_MOUNT_NODEV
ZFS_AC_KERNEL_SHRINK
ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
ZFS_AC_KERNEL_S_INSTANCES_LIST_HEAD
ZFS_AC_KERNEL_S_D_OP
ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER

13
module/zfs/zfs_vfsops.c
View File

@ -68,7 +68,6 @@
#include <sys/zpl.h>
#include "zfs_comutil.h"
/*ARGSUSED*/
int
zfs_sync(struct super_block *sb, int wait, cred_t *cr)
@ -1093,7 +1092,17 @@ zfs_sb_prune(struct super_block *sb, unsigned long nr_to_scan, int *objects)
ZFS_ENTER(zsb);
#if defined(HAVE_SPLIT_SHRINKER_CALLBACK)
#if defined(HAVE_SPLIT_SHRINKER_CALLBACK) && \
defined(SHRINK_CONTROL_HAS_NID) && \
defined(SHRINKER_NUMA_AWARE)
if (sb->s_shrink.flags & SHRINKER_NUMA_AWARE) {
*objects = 0;
for_each_online_node(sc.nid)
*objects += (*shrinker->scan_objects)(shrinker, &sc);
} else {
*objects = (*shrinker->scan_objects)(shrinker, &sc);
}
#elif defined(HAVE_SPLIT_SHRINKER_CALLBACK)
*objects = (*shrinker->scan_objects)(shrinker, &sc);
#elif defined(HAVE_SHRINK)
*objects = (*shrinker->shrink)(shrinker, &sc);