lkml.org 
[lkml]   [2016]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
SubjectRe: Linux 4.9-rc6
From
Date
On Mon, 2016-11-21 at 05:32 -0800, Eric Dumazet wrote:

>
> Oh, this was definitely my intent of course, thanks for noticing this
> typo ;)

V2 is fixing this, and brings back NUMA spreading,
(eg alloc_large_system_hash() done at boot time )


lpaa24:~# grep alloc_large /proc/vmallocinfo
0xffffc90000009000-0xffffc9000000c000 12288 alloc_large_system_hash+0x178/0x238 pages=2 vmalloc N0=1 N1=1
0xffffc9000000c000-0xffffc9000000f000 12288 alloc_large_system_hash+0x178/0x238 pages=2 vmalloc N0=1 N1=1
0xffffc9000001e000-0xffffc9000009f000 528384 alloc_large_system_hash+0x178/0x238 pages=128 vmalloc N0=64 N1=64
0xffffc9000009f000-0xffffc900000e0000 266240 alloc_large_system_hash+0x178/0x238 pages=64 vmalloc N0=32 N1=32
0xffffc900001d3000-0xffffc900101d4000 268439552 alloc_large_system_hash+0x178/0x238 pages=65536 vmalloc vpages N0=32768 N1=32768
0xffffc900101d4000-0xffffc900181d5000 134221824 alloc_large_system_hash+0x178/0x238 pages=32768 vmalloc vpages N0=16384 N1=16384
0xffffc900181d5000-0xffffc900185d6000 4198400 alloc_large_system_hash+0x178/0x238 pages=1024 vmalloc vpages N0=512 N1=512
0xffffc900185d6000-0xffffc900189d7000 4198400 alloc_large_system_hash+0x178/0x238 pages=1024 vmalloc vpages N0=512 N1=512
0xffffc9001b271000-0xffffc9001b672000 4198400 alloc_large_system_hash+0x178/0x238 pages=1024 vmalloc vpages N0=512 N1=512
0xffffc9001b672000-0xffffc9001b675000 12288 alloc_large_system_hash+0x178/0x238 pages=2 vmalloc N0=1 N1=1
0xffffc9001b675000-0xffffc9001b776000 1052672 alloc_large_system_hash+0x178/0x238 pages=256 vmalloc N0=128 N1=128
0xffffc9001b776000-0xffffc9001b977000 2101248 alloc_large_system_hash+0x178/0x238 pages=512 vmalloc N0=256 N1=256
0xffffc9001b977000-0xffffc9001bb78000 2101248 alloc_large_system_hash+0x178/0x238 pages=512 vmalloc N0=256 N1=256
0xffffc9001c075000-0xffffc9001c176000 1052672 alloc_large_system_hash+0x178/0x238 pages=256 vmalloc N0=128 N1=128


mm/vmalloc.c | 47 +++++++++++++++++++++++++++++++++++++++--------
1 file changed, 39 insertions(+), 8 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index f2481cb4e6b2..f4b9c9238f86 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -21,6 +21,7 @@
#include <linux/debugobjects.h>
#include <linux/kallsyms.h>
#include <linux/list.h>
+#include <linux/mempolicy.h>
#include <linux/notifier.h>
#include <linux/rbtree.h>
#include <linux/radix-tree.h>
@@ -1602,9 +1603,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
pgprot_t prot, int node)
{
struct page **pages;
- unsigned int nr_pages, array_size, i;
+ unsigned int nr_pages, array_size, i, j;
const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;
+ const gfp_t multi_alloc_mask = (alloc_mask & ~__GFP_DIRECT_RECLAIM) | __GFP_NORETRY;
+ int max_node_order = MAX_ORDER - 1;

nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
array_size = (nr_pages * sizeof(struct page *));
@@ -1624,20 +1627,48 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
return NULL;
}

- for (i = 0; i < area->nr_pages; i++) {
- struct page *page;
+ if (IS_ENABLED(CONFIG_NUMA) && nr_online_nodes > 1) {
+ struct mempolicy *policy = current->mempolicy;
+ int pages_per_node;

- if (node == NUMA_NO_NODE)
- page = alloc_page(alloc_mask);
- else
- page = alloc_pages_node(node, alloc_mask, 0);
+ if (policy && policy->mode == MPOL_INTERLEAVE) {
+ pages_per_node = DIV_ROUND_UP(nr_pages,
+ nr_online_nodes);
+ max_node_order = min(max_node_order,
+ ilog2(pages_per_node));
+ }
+ }
+
+ for (i = 0; i < area->nr_pages;) {
+ unsigned int chunk_order = min(ilog2(area->nr_pages - i),
+ max_node_order);
+ struct page *page = NULL;
+
+ while (chunk_order) {
+ if (node == NUMA_NO_NODE)
+ page = alloc_pages(multi_alloc_mask, chunk_order);
+ else
+ page = alloc_pages_node(node, multi_alloc_mask, chunk_order);
+ if (page) {
+ split_page(page, chunk_order);
+ break;
+ }
+ chunk_order--;
+ }
+ if (!page) {
+ if (node == NUMA_NO_NODE)
+ page = alloc_pages(alloc_mask, 0);
+ else
+ page = alloc_pages_node(node, alloc_mask, 0);
+ }

if (unlikely(!page)) {
/* Successfully allocated i pages, free them in __vunmap() */
area->nr_pages = i;
goto fail;
}
- area->pages[i] = page;
+ for (j = 0; j < (1U << chunk_order); j++)
+ area->pages[i++] = page++;
if (gfpflags_allow_blocking(gfp_mask))
cond_resched();
}

\
 
 \ /
  Last update: 2016-11-21 14:52    [W:0.116 / U:0.376 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site