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author | Michal Hocko <mhocko@suse.cz> | 2011-03-24 00:42:40 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-24 03:46:32 +0100 |
commit | dde79e005a769d800166687c9e00d50d93e411ff (patch) | |
tree | a38166f535b48063bd680deb64edbedf4395cfed | |
parent | mm/memcontrol.c: suppress uninitialized-var warning with older gcc's (diff) | |
download | linux-dde79e005a769d800166687c9e00d50d93e411ff.tar.xz linux-dde79e005a769d800166687c9e00d50d93e411ff.zip |
page_cgroup: reduce allocation overhead for page_cgroup array for CONFIG_SPARSEMEM
Currently we are allocating a single page_cgroup array per memory section
(stored in mem_section->base) when CONFIG_SPARSEMEM is selected. This is
correct but memory inefficient solution because the allocated memory
(unless we fall back to vmalloc) is not kmalloc friendly:
- 32b - 16384 entries (20B per entry) fit into 327680B so the
524288B slab cache is used
- 32b with PAE - 131072 entries with 2621440B fit into 4194304B
- 64b - 32768 entries (40B per entry) fit into 2097152 cache
This is ~37% wasted space per memory section and it sumps up for the whole
memory. On a x86_64 machine it is something like 6MB per 1GB of RAM.
We can reduce the internal fragmentation by using alloc_pages_exact which
allocates PAGE_SIZE aligned blocks so we will get down to <4kB wasted
memory per section which is much better.
We still need a fallback to vmalloc because we have no guarantees that we
will have a continuous memory of that size (order-10) later on during the
hotplug events.
[hannes@cmpxchg.org: do not define unused free_page_cgroup() without memory hotplug]
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | mm/page_cgroup.c | 58 |
1 files changed, 36 insertions, 22 deletions
diff --git a/mm/page_cgroup.c b/mm/page_cgroup.c index 6c3f7a6a481a..8e7577cdf5e4 100644 --- a/mm/page_cgroup.c +++ b/mm/page_cgroup.c @@ -130,7 +130,38 @@ struct page *lookup_cgroup_page(struct page_cgroup *pc) return page; } -/* __alloc_bootmem...() is protected by !slab_available() */ +static void *__init_refok alloc_page_cgroup(size_t size, int nid) +{ + void *addr = NULL; + + addr = alloc_pages_exact(size, GFP_KERNEL | __GFP_NOWARN); + if (addr) + return addr; + + if (node_state(nid, N_HIGH_MEMORY)) + addr = vmalloc_node(size, nid); + else + addr = vmalloc(size); + + return addr; +} + +#ifdef CONFIG_MEMORY_HOTPLUG +static void free_page_cgroup(void *addr) +{ + if (is_vmalloc_addr(addr)) { + vfree(addr); + } else { + struct page *page = virt_to_page(addr); + if (!PageReserved(page)) { /* Is bootmem ? */ + size_t table_size = + sizeof(struct page_cgroup) * PAGES_PER_SECTION; + free_pages_exact(addr, table_size); + } + } +} +#endif + static int __init_refok init_section_page_cgroup(unsigned long pfn) { struct page_cgroup *base, *pc; @@ -147,17 +178,8 @@ static int __init_refok init_section_page_cgroup(unsigned long pfn) nid = page_to_nid(pfn_to_page(pfn)); table_size = sizeof(struct page_cgroup) * PAGES_PER_SECTION; - VM_BUG_ON(!slab_is_available()); - if (node_state(nid, N_HIGH_MEMORY)) { - base = kmalloc_node(table_size, - GFP_KERNEL | __GFP_NOWARN, nid); - if (!base) - base = vmalloc_node(table_size, nid); - } else { - base = kmalloc(table_size, GFP_KERNEL | __GFP_NOWARN); - if (!base) - base = vmalloc(table_size); - } + base = alloc_page_cgroup(table_size, nid); + /* * The value stored in section->page_cgroup is (base - pfn) * and it does not point to the memory block allocated above, @@ -189,16 +211,8 @@ void __free_page_cgroup(unsigned long pfn) if (!ms || !ms->page_cgroup) return; base = ms->page_cgroup + pfn; - if (is_vmalloc_addr(base)) { - vfree(base); - ms->page_cgroup = NULL; - } else { - struct page *page = virt_to_page(base); - if (!PageReserved(page)) { /* Is bootmem ? */ - kfree(base); - ms->page_cgroup = NULL; - } - } + free_page_cgroup(base); + ms->page_cgroup = NULL; } int __meminit online_page_cgroup(unsigned long start_pfn, |