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mem-hotplug: avoid multiple zones sharing same boot strapping boot_pageset 

For each new populated zone of hotadded node, need to update its pagesets
with dynamically allocated per_cpu_pageset struct for all possible CPUs:

    1) Detach zone->pageset from the shared boot_pageset
       at end of __build_all_zonelists().

    2) Use mutex to protect zone->pageset when it's still
       shared in onlined_pages()

Otherwises, multiple zones of different nodes would share same boot strapping
boot_pageset for same CPU, which will finally cause below kernel panic:

  ------------[ cut here ]------------
  kernel BUG at mm/page_alloc.c:1239!
  invalid opcode: 0000 [#1] SMP
  ...
  Call Trace:
   [<ffffffff811300c1>] __alloc_pages_nodemask+0x131/0x7b0
   [<ffffffff81162e67>] alloc_pages_current+0x87/0xd0
   [<ffffffff81128407>] __page_cache_alloc+0x67/0x70
   [<ffffffff811325f0>] __do_page_cache_readahead+0x120/0x260
   [<ffffffff81132751>] ra_submit+0x21/0x30
   [<ffffffff811329c6>] ondemand_readahead+0x166/0x2c0
   [<ffffffff81132ba0>] page_cache_async_readahead+0x80/0xa0
   [<ffffffff8112a0e4>] generic_file_aio_read+0x364/0x670
   [<ffffffff81266cfa>] nfs_file_read+0xca/0x130
   [<ffffffff8117b20a>] do_sync_read+0xfa/0x140
   [<ffffffff8117bf75>] vfs_read+0xb5/0x1a0
   [<ffffffff8117c151>] sys_read+0x51/0x80
   [<ffffffff8103c032>] system_call_fastpath+0x16/0x1b
  RIP  [<ffffffff8112ff13>] get_page_from_freelist+0x883/0x900
   RSP <ffff88000d1e78a8>
  ---[ end trace 4bda28328b9990db ]

[akpm@linux-foundation.org: merge fix]
Signed-off-by: Haicheng Li <haicheng.li@linux.intel.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: Andi Kleen <andi.kleen@intel.com>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Haicheng Li 2010-05-24 14:32:51 -07:00 committed by Linus Torvalds
parent 319774e25f
commit 1f522509c7
5 changed files with 29 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/mmzone.h
View File

@ -652,7 +652,7 @@ typedef struct pglist_data {
void get_zone_counts(unsigned long *active, unsigned long *inactive,
unsigned long *free);
void build_all_zonelists(void);
void build_all_zonelists(void *data);
void wakeup_kswapd(struct zone *zone, int order);
int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
int classzone_idx, int alloc_flags);

2
init/main.c
View File

@ -567,7 +567,7 @@ asmlinkage void __init start_kernel(void)
setup_per_cpu_areas();
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
build_all_zonelists();
build_all_zonelists(NULL);
page_alloc_init();
printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);

2
kernel/cpu.c
View File

@ -358,7 +358,7 @@ int __cpuinit cpu_up(unsigned int cpu)
}
if (pgdat->node_zonelists->_zonerefs->zone == NULL)
build_all_zonelists();
build_all_zonelists(NULL);
#endif
cpu_maps_update_begin();

18
mm/memory_hotplug.c
View File

@ -389,6 +389,11 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
int nid;
int ret;
struct memory_notify arg;
/*
* mutex to protect zone->pageset when it's still shared
* in onlined_pages()
*/
static DEFINE_MUTEX(zone_pageset_mutex);
arg.start_pfn = pfn;
arg.nr_pages = nr_pages;
@ -415,12 +420,14 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
* This means the page allocator ignores this zone.
* So, zonelist must be updated after online.
*/
mutex_lock(&zone_pageset_mutex);
if (!populated_zone(zone))
need_zonelists_rebuild = 1;
ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
online_pages_range);
if (ret) {
mutex_unlock(&zone_pageset_mutex);
printk(KERN_DEBUG "online_pages %lx at %lx failed\n",
nr_pages, pfn);
memory_notify(MEM_CANCEL_ONLINE, &arg);
@ -429,8 +436,12 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
zone->present_pages += onlined_pages;
zone->zone_pgdat->node_present_pages += onlined_pages;
if (need_zonelists_rebuild)
build_all_zonelists(zone);
else
zone_pcp_update(zone);
zone_pcp_update(zone);
mutex_unlock(&zone_pageset_mutex);
setup_per_zone_wmarks();
calculate_zone_inactive_ratio(zone);
if (onlined_pages) {
@ -438,10 +449,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
}
if (need_zonelists_rebuild)
build_all_zonelists();
else
vm_total_pages = nr_free_pagecache_pages();
vm_total_pages = nr_free_pagecache_pages();
writeback_set_ratelimit();

17
mm/page_alloc.c
View File

@ -2572,7 +2572,7 @@ int numa_zonelist_order_handler(ctl_table *table, int write,
NUMA_ZONELIST_ORDER_LEN);
user_zonelist_order = oldval;
} else if (oldval != user_zonelist_order)
build_all_zonelists();
build_all_zonelists(NULL);
}
out:
mutex_unlock(&zl_order_mutex);
@ -2922,9 +2922,10 @@ static void build_zonelist_cache(pg_data_t *pgdat)
*/
static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch);
static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset);
static void setup_zone_pageset(struct zone *zone);
/* return values int ....just for stop_machine() */
static int __build_all_zonelists(void *dummy)
static __init_refok int __build_all_zonelists(void *data)
{
int nid;
int cpu;
@ -2939,6 +2940,14 @@ static int __build_all_zonelists(void *dummy)
build_zonelist_cache(pgdat);
}
#ifdef CONFIG_MEMORY_HOTPLUG
/* Setup real pagesets for the new zone */
if (data) {
struct zone *zone = data;
setup_zone_pageset(zone);
}
#endif
/*
* Initialize the boot_pagesets that are going to be used
* for bootstrapping processors. The real pagesets for
@ -2958,7 +2967,7 @@ static int __build_all_zonelists(void *dummy)
return 0;
}
void build_all_zonelists(void)
void build_all_zonelists(void *data)
{
set_zonelist_order();
@ -2969,7 +2978,7 @@ void build_all_zonelists(void)
} else {
/* we have to stop all cpus to guarantee there is no user
of zonelist */
stop_machine(__build_all_zonelists, NULL, NULL);
stop_machine(__build_all_zonelists, data, NULL);
/* cpuset refresh routine should be here */
}
vm_total_pages = nr_free_pagecache_pages();