Messages in this thread | | | Date | Thu, 13 Sep 2012 19:06:09 +0900 | From | Kamezawa Hiroyuki <> | Subject | Re: [PATCH] memory cgroup: update root memory cgroup when node is onlined |
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(2012/09/13 16:14), Wen Congyang wrote: > root_mem_cgroup->info.nodeinfo is initialized when the system boots. > But NODE_DATA(nid) is null if the node is not onlined, so > root_mem_cgroup->info.nodeinfo[nid]->zoneinfo[zone].lruvec.zone contains > an invalid pointer. If we use numactl to bind a program to the node > after onlining the node and its memory, it will cause the kernel > panicked: > > [ 63.413436] BUG: unable to handle kernel NULL pointer dereference at 0000000000000f60 > [ 63.414161] IP: [<ffffffff811870b9>] __mod_zone_page_state+0x9/0x60 > [ 63.414161] PGD 0 > [ 63.414161] Oops: 0000 [#1] SMP > [ 63.414161] Modules linked in: acpi_memhotplug binfmt_misc dm_mirror dm_region_hash dm_log dm_mod ppdev sg microcode pcspkr virtio_console virtio_balloon snd_intel8x0 snd_ac9 > 7_codec ac97_bus snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc e1000 i2c_piix4 i2c_core floppy parport_pc parport sr_mod cdrom virtio_blk pata_acpi ata_g > eneric ata_piix libata scsi_mod > [ 63.414161] CPU 2 > [ 63.414161] Pid: 1219, comm: numactl Not tainted 3.6.0-rc5+ #180 Bochs Bochs > ... > [ 63.414161] Process numactl (pid: 1219, threadinfo ffff880039abc000, task ffff8800383c4ce0) > [ 63.414161] Stack: > [ 63.414161] ffff880039abdaf8 ffffffff8117390f ffff880039abdaf8 000000008167c601 > [ 63.414161] ffffffff81174162 ffff88003a480f00 0000000000000001 ffff8800395e0000 > [ 63.414161] ffff88003dbd0e80 0000000000000282 ffff880039abdb48 ffffffff81174181 > [ 63.414161] Call Trace: > [ 63.414161] [<ffffffff8117390f>] __pagevec_lru_add_fn+0xdf/0x140 > [ 63.414161] [<ffffffff81174162>] ? pagevec_lru_move_fn+0x92/0x100 > [ 63.414161] [<ffffffff81174181>] pagevec_lru_move_fn+0xb1/0x100 > [ 63.414161] [<ffffffff81173830>] ? lru_add_page_tail+0x1b0/0x1b0 > [ 63.414161] [<ffffffff811dff71>] ? exec_mmap+0x121/0x230 > [ 63.414161] [<ffffffff811741ec>] __pagevec_lru_add+0x1c/0x30 > [ 63.414161] [<ffffffff81174383>] lru_add_drain_cpu+0xa3/0x130 > [ 63.414161] [<ffffffff8117443f>] lru_add_drain+0x2f/0x40 > [ 63.414161] [<ffffffff81196da9>] exit_mmap+0x69/0x160 > [ 63.414161] [<ffffffff810db115>] ? lock_release_holdtime+0x35/0x1a0 > [ 63.414161] [<ffffffff81069c37>] mmput+0x77/0x100 > [ 63.414161] [<ffffffff811dffc0>] exec_mmap+0x170/0x230 > [ 63.414161] [<ffffffff811e0152>] flush_old_exec+0xd2/0x140 > [ 63.414161] [<ffffffff812343ea>] load_elf_binary+0x32a/0xe70 > [ 63.414161] [<ffffffff810d700d>] ? trace_hardirqs_off+0xd/0x10 > [ 63.414161] [<ffffffff810b231f>] ? local_clock+0x6f/0x80 > [ 63.414161] [<ffffffff810db115>] ? lock_release_holdtime+0x35/0x1a0 > [ 63.414161] [<ffffffff810dd813>] ? __lock_release+0x133/0x1a0 > [ 63.414161] [<ffffffff811e22e7>] ? search_binary_handler+0x1a7/0x4a0 > [ 63.414161] [<ffffffff811e22f3>] search_binary_handler+0x1b3/0x4a0 > [ 63.414161] [<ffffffff811e2194>] ? search_binary_handler+0x54/0x4a0 > [ 63.414161] [<ffffffff812340c0>] ? set_brk+0xe0/0xe0 > [ 63.414161] [<ffffffff811e284f>] do_execve_common+0x26f/0x320 > [ 63.414161] [<ffffffff811bde33>] ? kmem_cache_alloc+0x113/0x220 > [ 63.414161] [<ffffffff811e298a>] do_execve+0x3a/0x40 > [ 63.414161] [<ffffffff8102061a>] sys_execve+0x4a/0x80 > [ 63.414161] [<ffffffff81686c6c>] stub_execve+0x6c/0xc0 > [ 63.414161] Code: ff 03 00 00 48 c1 e7 0b 48 c1 e2 07 48 29 d7 48 03 3c c5 c0 27 d2 81 e8 a6 fe ff ff c9 c3 0f 1f 40 00 55 48 89 e5 0f 1f 44 00 00 <48> 8b 4f 60 89 f6 48 8d 44 31 40 65 44 8a 40 02 45 0f be c0 41 > > The reason is that we don't update root_mem_cgroup->info.nodeinfo[nid]->zoneinfo[zone].lruvec.zone > when onlining the node, and we try to access it. > > Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> > Reported-by: Tang Chen <tangchen@cn.fujitsu.com>
Thank you !!!
But, I think, all memcg's lruvec should be updated. I guess you'll see panic again if you put tasks under memcg and allocates memory on a new node.
Could you dig more ?
Thanks, -Kame
> --- > include/linux/memcontrol.h | 7 +++++++ > mm/memcontrol.c | 14 ++++++++++++++ > mm/memory_hotplug.c | 2 ++ > 3 files changed, 23 insertions(+), 0 deletions(-) > > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h > index 8d9489f..87d8b77 100644 > --- a/include/linux/memcontrol.h > +++ b/include/linux/memcontrol.h > @@ -182,6 +182,9 @@ unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order, > unsigned long *total_scanned); > > void mem_cgroup_count_vm_event(struct mm_struct *mm, enum vm_event_item idx); > + > +void update_root_mem_cgroup(int nid); > + > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > void mem_cgroup_split_huge_fixup(struct page *head); > #endif > @@ -374,6 +377,10 @@ static inline void mem_cgroup_replace_page_cache(struct page *oldpage, > struct page *newpage) > { > } > + > +static inline void update_root_mem_cgroup(int nid) > +{ > +} > #endif /* CONFIG_MEMCG */ > > #if !defined(CONFIG_MEMCG) || !defined(CONFIG_DEBUG_VM) > diff --git a/mm/memcontrol.c b/mm/memcontrol.c > index 795e525..c997a46 100644 > --- a/mm/memcontrol.c > +++ b/mm/memcontrol.c > @@ -3427,6 +3427,20 @@ void mem_cgroup_replace_page_cache(struct page *oldpage, > __mem_cgroup_commit_charge(memcg, newpage, 1, type, true); > } > > +/* NODE_DATA(nid) is changed */ > +void update_root_mem_cgroup(int nid) > +{ > + struct mem_cgroup_per_node *pn; > + struct mem_cgroup_per_zone *mz; > + int zone; > + > + pn = root_mem_cgroup->info.nodeinfo[nid]; > + for (zone = 0; zone < MAX_NR_ZONES; zone++) { > + mz = &pn->zoneinfo[zone]; > + lruvec_init(&mz->lruvec, &NODE_DATA(nid)->node_zones[zone]); > + } > +} > + > #ifdef CONFIG_DEBUG_VM > static struct page_cgroup *lookup_page_cgroup_used(struct page *page) > { > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c > index 3ad25f9..bf03b02 100644 > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -555,6 +555,8 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) > > /* we can use NODE_DATA(nid) from here */ > > + update_root_mem_cgroup(nid); > + > /* init node's zones as empty zones, we don't have any present pages.*/ > free_area_init_node(nid, zones_size, start_pfn, zholes_size); > >
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