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Linux 5.9 compat: NR_SLAB_RECLAIMABLE 

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
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 1 additions and 47 deletions
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9
config/kernel-global_page_state.m4
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
])

25
include/os/linux/kernel/linux/page_compat.h
View File

@ -35,16 +35,6 @@
#else
#define nr_inactive_file_pages() global_zone_page_state(NR_INACTIVE_FILE)
#endif
#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B)
#define nr_slab_reclaimable_pages() \
global_node_page_state(NR_SLAB_RECLAIMABLE_B)
#else
#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE)
#define nr_slab_reclaimable_pages() global_node_page_state(NR_SLAB_RECLAIMABLE)
#else
#define nr_slab_reclaimable_pages() global_zone_page_state(NR_SLAB_RECLAIMABLE)
#endif
#endif
#elif defined(ZFS_GLOBAL_NODE_PAGE_STATE)
@ -64,16 +54,6 @@
#else
#define nr_inactive_file_pages() global_page_state(NR_INACTIVE_FILE)
#endif
#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B)
#define nr_slab_reclaimable_pages() \
global_node_page_state(NR_SLAB_RECLAIMABLE_B)
#else
#if defined(ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE)
#define nr_slab_reclaimable_pages() global_node_page_state(NR_SLAB_RECLAIMABLE)
#else
#define nr_slab_reclaimable_pages() global_page_state(NR_SLAB_RECLAIMABLE)
#endif
#endif
#else
@ -81,11 +61,6 @@
#define nr_file_pages() global_page_state(NR_FILE_PAGES)
#define nr_inactive_anon_pages() global_page_state(NR_INACTIVE_ANON)
#define nr_inactive_file_pages() global_page_state(NR_INACTIVE_FILE)
#ifdef ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B
#define nr_slab_reclaimable_pages() global_page_state(NR_SLAB_RECLAIMABLE_B)
#else
#define nr_slab_reclaimable_pages() global_page_state(NR_SLAB_RECLAIMABLE)
#endif /* ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B */
#endif /* ZFS_GLOBAL_ZONE_PAGE_STATE */

11
include/os/linux/spl/sys/vmsystm.h
View File

@ -47,17 +47,6 @@
#define membar_producer() smp_wmb()
#define physmem zfs_totalram_pages
#ifdef ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B
#define freemem (nr_free_pages() + \
global_page_state(NR_INACTIVE_FILE) + \
global_page_state(NR_INACTIVE_ANON) + \
global_page_state(NR_SLAB_RECLAIMABLE_B))
#else
#define freemem (nr_free_pages() + \
global_page_state(NR_INACTIVE_FILE) + \
global_page_state(NR_INACTIVE_ANON) + \
global_page_state(NR_SLAB_RECLAIMABLE))
#endif /* ZFS_ENUM_NODE_STAT_ITEM_NR_SLAB_RECLAIMABLE_B */
#define xcopyin(from, to, size) copy_from_user(to, from, size)
#define xcopyout(from, to, size) copy_to_user(to, from, size)

3
module/os/linux/zfs/arc_os.c
View File

@ -113,8 +113,7 @@ arc_free_memory(void)
return (ptob(si.freeram - si.freehigh));
#else
return (ptob(nr_free_pages() +
nr_inactive_file_pages() +
nr_slab_reclaimable_pages()));
nr_inactive_file_pages()));
#endif /* CONFIG_HIGHMEM */
}