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authorMichal Hocko <mhocko@suse.com>2017-07-06 15:41:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 16:24:35 -0700
commitf70029bbaacbfa8f082d2b4988717cba4e269f17 (patch)
treeda4860c5227a317637194b6ca9ee4c6becfddb53
parent57c0a17238e22395428248c53f8e390c051c88b8 (diff)
downloadlinux-f70029bbaacbfa8f082d2b4988717cba4e269f17.tar.bz2
mm, memory_hotplug: drop CONFIG_MOVABLE_NODE
Commit 20b2f52b73fe ("numa: add CONFIG_MOVABLE_NODE for movable-dedicated node") has introduced CONFIG_MOVABLE_NODE without a good explanation on why it is actually useful. It makes a lot of sense to make movable node semantic opt in but we already have that because the feature has to be explicitly enabled on the kernel command line. A config option on top only makes the configuration space larger without a good reason. It also adds an additional ifdefery that pollutes the code. Just drop the config option and make it de-facto always enabled. This shouldn't introduce any change to the semantic. Link: http://lkml.kernel.org/r/20170529114141.536-3-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Reza Arbab <arbab@linux.vnet.ibm.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Kani Toshimitsu <toshi.kani@hpe.com> Cc: Chen Yucong <slaoub@gmail.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Rientjes <rientjes@google.com> Cc: Daniel Kiper <daniel.kiper@oracle.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt7
-rw-r--r--drivers/base/node.c4
-rw-r--r--include/linux/memblock.h18
-rw-r--r--include/linux/nodemask.h4
-rw-r--r--mm/Kconfig26
-rw-r--r--mm/memblock.c2
-rw-r--r--mm/memory_hotplug.c4
-rw-r--r--mm/page_alloc.c2
8 files changed, 5 insertions, 62 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 34ae9663aefd..dd7abbea8188 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2303,8 +2303,11 @@
that the amount of memory usable for all allocations
is not too small.
- movable_node [KNL] Boot-time switch to enable the effects
- of CONFIG_MOVABLE_NODE=y. See mm/Kconfig for details.
+ movable_node [KNL] Boot-time switch to make hotplugable memory
+ NUMA nodes to be movable. This means that the memory
+ of such nodes will be usable only for movable
+ allocations which rules out almost all kernel
+ allocations. Use with caution!
MTD_Partition= [MTD]
Format: <name>,<region-number>,<size>,<offset>
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 6b1ee371ee97..73d39bc58c42 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -639,9 +639,7 @@ static struct node_attr node_state_attr[] = {
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY),
#endif
-#ifdef CONFIG_MOVABLE_NODE
[N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY),
-#endif
[N_CPU] = _NODE_ATTR(has_cpu, N_CPU),
};
@@ -652,9 +650,7 @@ static struct attribute *node_state_attrs[] = {
#ifdef CONFIG_HIGHMEM
&node_state_attr[N_HIGH_MEMORY].attr.attr,
#endif
-#ifdef CONFIG_MOVABLE_NODE
&node_state_attr[N_MEMORY].attr.attr,
-#endif
&node_state_attr[N_CPU].attr.attr,
NULL
};
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 8098695e5d8d..1199e605d676 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -57,10 +57,8 @@ struct memblock {
extern struct memblock memblock;
extern int memblock_debug;
-#ifdef CONFIG_MOVABLE_NODE
/* If movable_node boot option specified */
extern bool movable_node_enabled;
-#endif /* CONFIG_MOVABLE_NODE */
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
#define __init_memblock __meminit
@@ -169,7 +167,6 @@ void __next_reserved_mem_region(u64 *idx, phys_addr_t *out_start,
i != (u64)ULLONG_MAX; \
__next_reserved_mem_region(&i, p_start, p_end))
-#ifdef CONFIG_MOVABLE_NODE
static inline bool memblock_is_hotpluggable(struct memblock_region *m)
{
return m->flags & MEMBLOCK_HOTPLUG;
@@ -179,16 +176,6 @@ static inline bool __init_memblock movable_node_is_enabled(void)
{
return movable_node_enabled;
}
-#else
-static inline bool memblock_is_hotpluggable(struct memblock_region *m)
-{
- return false;
-}
-static inline bool movable_node_is_enabled(void)
-{
- return false;
-}
-#endif
static inline bool memblock_is_mirror(struct memblock_region *m)
{
@@ -296,7 +283,6 @@ phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);
-#ifdef CONFIG_MOVABLE_NODE
/*
* Set the allocation direction to bottom-up or top-down.
*/
@@ -314,10 +300,6 @@ static inline bool memblock_bottom_up(void)
{
return memblock.bottom_up;
}
-#else
-static inline void __init memblock_set_bottom_up(bool enable) {}
-static inline bool memblock_bottom_up(void) { return false; }
-#endif
/* Flags for memblock_alloc_base() amd __memblock_alloc_base() */
#define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index f746e44d4046..cf0b91c3ec12 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -387,11 +387,7 @@ enum node_states {
#else
N_HIGH_MEMORY = N_NORMAL_MEMORY,
#endif
-#ifdef CONFIG_MOVABLE_NODE
N_MEMORY, /* The node has memory(regular, high, movable) */
-#else
- N_MEMORY = N_HIGH_MEMORY,
-#endif
N_CPU, /* The node has one or more cpus */
NR_NODE_STATES
};
diff --git a/mm/Kconfig b/mm/Kconfig
index 9870baafb096..857f6ef368d4 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -149,32 +149,6 @@ config NO_BOOTMEM
config MEMORY_ISOLATION
bool
-config MOVABLE_NODE
- bool "Enable to assign a node which has only movable memory"
- depends on HAVE_MEMBLOCK
- depends on NO_BOOTMEM
- depends on X86_64 || OF_EARLY_FLATTREE || MEMORY_HOTPLUG
- depends on NUMA
- default n
- help
- Allow a node to have only movable memory. Pages used by the kernel,
- such as direct mapping pages cannot be migrated. So the corresponding
- memory device cannot be hotplugged. This option allows the following
- two things:
- - When the system is booting, node full of hotpluggable memory can
- be arranged to have only movable memory so that the whole node can
- be hot-removed. (need movable_node boot option specified).
- - After the system is up, the option allows users to online all the
- memory of a node as movable memory so that the whole node can be
- hot-removed.
-
- Users who don't use the memory hotplug feature are fine with this
- option on since they don't specify movable_node boot option or they
- don't online memory as movable.
-
- Say Y here if you want to hotplug a whole node.
- Say N here if you want kernel to use memory on all nodes evenly.
-
#
# Only be set on architectures that have completely implemented memory hotplug
# feature. If you are not sure, don't touch it.
diff --git a/mm/memblock.c b/mm/memblock.c
index 7b8a5db76a2f..41eaeebb03dc 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -54,9 +54,7 @@ struct memblock memblock __initdata_memblock = {
};
int memblock_debug __initdata_memblock;
-#ifdef CONFIG_MOVABLE_NODE
bool movable_node_enabled __initdata_memblock = false;
-#endif
static bool system_has_some_mirror __initdata_memblock = false;
static int memblock_can_resize __initdata_memblock;
static int memblock_memory_in_slab __initdata_memblock = 0;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 937319899e61..0dc8cf0a59d7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1572,11 +1572,7 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
static int __init cmdline_parse_movable_node(char *p)
{
-#ifdef CONFIG_MOVABLE_NODE
movable_node_enabled = true;
-#else
- pr_warn("movable_node option not supported\n");
-#endif
return 0;
}
early_param("movable_node", cmdline_parse_movable_node);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index a35add8d7c0b..bd65b60939b6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -113,9 +113,7 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = { { [0] = 1UL } },
#endif
-#ifdef CONFIG_MOVABLE_NODE
[N_MEMORY] = { { [0] = 1UL } },
-#endif
[N_CPU] = { { [0] = 1UL } },
#endif /* NUMA */
};