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Linux 5.9 compat: NR_SLAB_RECLAIMABLE

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Commit dcdc12e added compatibility code to treat NR_SLAB_RECLAIMABLE_B
as if it were the same as NR_SLAB_RECLAIMABLE.  However, the new value
is in bytes while the old value was in pages which means they are not
interchangeable.

The only place the reclaimable slab size is used is as a component of
the calculation done by arc_free_memory().  This function returns the
amount of memory the ARC considers to be free or reclaimable at little
cost.  Rather than switch to a new interface to get this value it has
been removed it from the calculation.  It is normally a minor component
compared to the number of inactive or free pages, and removing it
aligns the behavior with the FreeBSD version of arc_free_memory().

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Coleman Kane <ckane@colemankane.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #10834
This commit is contained in:
Brian Behlendorf
2020-08-29 20:57:45 -07:00
committed by GitHub
parent 62663fb7ec
commit 3e29e1971b
4 changed files with 1 additions and 47 deletions
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config/kernel-global_page_state.m4
-9
View File
@@ -94,9 +94,6 @@ AC_DEFUN([ZFS_AC_KERNEL_GLOBAL_ZONE_PAGE_STATE_SANITY], [
ZFS_AC_KERNEL_GLOBAL_PAGE_STATE_ENUM_CHECK([NR_FILE_PAGES])
ZFS_AC_KERNEL_GLOBAL_PAGE_STATE_ENUM_CHECK([NR_INACTIVE_ANON])
ZFS_AC_KERNEL_GLOBAL_PAGE_STATE_ENUM_CHECK([NR_INACTIVE_FILE])
AS_IF([test -z "$ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B"],[
ZFS_AC_KERNEL_GLOBAL_PAGE_STATE_ENUM_CHECK([NR_SLAB_RECLAIMABLE])
])
AC_MSG_RESULT(yes)
])
@@ -119,10 +116,6 @@ AC_DEFUN([ZFS_AC_KERNEL_GLOBAL_PAGE_STATE], [
[node_stat_item], [$LINUX/include/linux/mmzone.h])
ZFS_AC_KERNEL_ENUM_MEMBER([NR_INACTIVE_FILE],
[node_stat_item], [$LINUX/include/linux/mmzone.h])
ZFS_AC_KERNEL_ENUM_MEMBER([NR_SLAB_RECLAIMABLE],
[node_stat_item], [$LINUX/include/linux/mmzone.h])
ZFS_AC_KERNEL_ENUM_MEMBER([NR_SLAB_RECLAIMABLE_B],
[node_stat_item], [$LINUX/include/linux/mmzone.h])
ZFS_AC_KERNEL_ENUM_MEMBER([NR_FILE_PAGES],
[zone_stat_item], [$LINUX/include/linux/mmzone.h])
@@ -130,8 +123,6 @@ AC_DEFUN([ZFS_AC_KERNEL_GLOBAL_PAGE_STATE], [
[zone_stat_item], [$LINUX/include/linux/mmzone.h])
ZFS_AC_KERNEL_ENUM_MEMBER([NR_INACTIVE_FILE],
[zone_stat_item], [$LINUX/include/linux/mmzone.h])
ZFS_AC_KERNEL_ENUM_MEMBER([NR_SLAB_RECLAIMABLE],
[zone_stat_item], [$LINUX/include/linux/mmzone.h])
ZFS_AC_KERNEL_GLOBAL_ZONE_PAGE_STATE_SANITY
])