The patch titled
Subject: mm, page_alloc: remove boot pageset initialization from memory hotplug
has been added to the -mm tree. Its filename is
mm-page_alloc-remove-boot-pageset-initialization-from-memory-hotplug.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-remove-boot-pageset-initialization-from-memory-hotplug.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-remove-boot-pageset-initialization-from-memory-hotplug.patch
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------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: mm, page_alloc: remove boot pageset initialization from memory hotplug
boot_pageset is a boot time hack which gets superseded by normal pagesets
later in the boot process. It makes zero sense to reinitialize it again
and again during memory hotplug.
Link: http://lkml.kernel.org/r/20170721143915.14161-3-mhocko@xxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Shaohua Li <shaohua.li@xxxxxxxxx>
Cc: Toshi Kani <toshi.kani@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 40 ++++++++++++++++++++++------------------
1 file changed, 22 insertions(+), 18 deletions(-)
diff -puN mm/page_alloc.c~mm-page_alloc-remove-boot-pageset-initialization-from-memory-hotplug mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-remove-boot-pageset-initialization-from-memory-hotplug
+++ a/mm/page_alloc.c
@@ -5077,7 +5077,7 @@ DEFINE_MUTEX(zonelists_mutex);
static int __build_all_zonelists(void *data)
{
int nid;
- int cpu;
+ int __maybe_unused cpu;
pg_data_t *self = data;
#ifdef CONFIG_NUMA
@@ -5098,23 +5098,8 @@ static int __build_all_zonelists(void *d
}
}
- /*
- * Initialize the boot_pagesets that are going to be used
- * for bootstrapping processors. The real pagesets for
- * each zone will be allocated later when the per cpu
- * allocator is available.
- *
- * boot_pagesets are used also for bootstrapping offline
- * cpus if the system is already booted because the pagesets
- * are needed to initialize allocators on a specific cpu too.
- * F.e. the percpu allocator needs the page allocator which
- * needs the percpu allocator in order to allocate its pagesets
- * (a chicken-egg dilemma).
- */
- for_each_possible_cpu(cpu) {
- setup_pageset(&per_cpu(boot_pageset, cpu), 0);
-
#ifdef CONFIG_HAVE_MEMORYLESS_NODES
+ for_each_possible_cpu(cpu) {
/*
* We now know the "local memory node" for each node--
* i.e., the node of the first zone in the generic zonelist.
@@ -5125,8 +5110,8 @@ static int __build_all_zonelists(void *d
*/
if (cpu_online(cpu))
set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu)));
-#endif
}
+#endif
return 0;
}
@@ -5134,7 +5119,26 @@ static int __build_all_zonelists(void *d
static noinline void __init
build_all_zonelists_init(void)
{
+ int cpu;
+
__build_all_zonelists(NULL);
+
+ /*
+ * Initialize the boot_pagesets that are going to be used
+ * for bootstrapping processors. The real pagesets for
+ * each zone will be allocated later when the per cpu
+ * allocator is available.
+ *
+ * boot_pagesets are used also for bootstrapping offline
+ * cpus if the system is already booted because the pagesets
+ * are needed to initialize allocators on a specific cpu too.
+ * F.e. the percpu allocator needs the page allocator which
+ * needs the percpu allocator in order to allocate its pagesets
+ * (a chicken-egg dilemma).
+ */
+ for_each_possible_cpu(cpu)
+ setup_pageset(&per_cpu(boot_pageset, cpu), 0);
+
mminit_verify_zonelist();
cpuset_init_current_mems_allowed();
}
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-vmscan-do-not-loop-on-too_many_isolated-for-ever.patch
mm-memory_hotplug-display-allowed-zones-in-the-preferred-ordering.patch
mm-memory_hotplug-remove-zone-restrictions.patch
mm-page_alloc-rip-out-zonelist_order_zone.patch
mm-page_alloc-remove-boot-pageset-initialization-from-memory-hotplug.patch
mm-page_alloc-do-not-set_cpu_numa_mem-on-empty-nodes-initialization.patch
mm-memory_hotplug-drop-zone-from-build_all_zonelists.patch
mm-memory_hotplug-remove-explicit-build_all_zonelists-from-try_online_node.patch
mm-page_alloc-simplify-zonelist-initialization.patch
mm-page_alloc-remove-stop_machine-from-build_all_zonelists.patch
mm-memory_hotplug-get-rid-of-zonelists_mutex.patch
mm-sparse-page_ext-drop-ugly-n_high_memory-branches-for-allocations.patch
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