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From: Qian Cai <cai@lca.pw>
To: Feng Tang <feng.tang@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Matthew Wilcox <willy@infradead.org>,
	Mel Gorman <mgorman@suse.de>, Kees Cook <keescook@chromium.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Iurii Zaikin <yzaikin@google.com>,
	andi.kleen@intel.com, tim.c.chen@intel.com,
	dave.hansen@intel.com, ying.huang@intel.com, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] make vm_committed_as_batch aware of vm overcommit policy
Date: Thu, 28 May 2020 10:18:02 -0400	[thread overview]
Message-ID: <20200528141802.GB1810@lca.pw> (raw)
In-Reply-To: <20200527104606.GE93879@shbuild999.sh.intel.com>

On Wed, May 27, 2020 at 06:46:06PM +0800, Feng Tang wrote:
> Hi Qian,
> 
> On Tue, May 26, 2020 at 10:25:39PM -0400, Qian Cai wrote:
> > > > > > [1] https://lkml.org/lkml/2020/3/5/57
> > > > > 
> > > > > Reverted this series fixed a warning under memory pressue.
> > > > 
> > > > Andrew, Stephen, can you drop this series?
> > > > 
> > > > > 
> > > > > [ 3319.257898] LTP: starting oom01
> > > > > [ 3319.284417] ------------[ cut here ]------------
> > > > > [ 3319.284439] memory commitment underflow
> > > 
> > > Thanks for the catch!
> > > 
> > > Could you share the info about the platform, like the CPU numbers
> > > and RAM size, and what's the mmap test size of your test program.
> > > It would be great if you can point me the link to the test program.
> > 
> > I have been reproduced this on both AMD and Intel. The test just
> > allocating memory and swapping.
> > 
> > https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/mem/oom/oom01.c
> > https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/mem/tunable/overcommit_memory.c
> > 
> > It might be better to run the whole LTP mm tests if none of the above
> > triggers it for you which has quite a few memory pressurers.
> > 
> > /opt/ltp/runltp -f mm
> 
> Thanks for sharing. I tried to reproduce this on 2 server plaforms,
> but can't reproduce it, and they are still under testing.
> 
> Meanwhile, could you help to try the below patch, which is based on
> Andi's suggestion and have some debug info. The warning is a little
> strange, as the condition is
> 
> 	(percpu_counter_read(&vm_committed_as) <
>                        -(s64)vm_committed_as_batch * num_online_cpus())
> 
> while for your platform (48 CPU + 128 GB RAM), the
> '-(s64)vm_committed_as_batch * num_online_cpus()'
> is a s64 value: '-32G', which makes the condition hard to be true,
> and when it is,  it could be triggered by some magic for s32/s64
> operations around the percpu-counter. 

The patch below does not fix anything.

[ 3160.275230][ T7955] LTP: starting oom01
[ 3160.306977][T106365] KK as:-59683  as_sum:6896  check:-32768 batch:256
[ 3160.307161][T106365] ------------[ cut here ]------------
[ 3160.307184][T106365] memory commitment underflow
[ 3160.307216][T106365] WARNING: CPU: 103 PID: 106365 at mm/util.c:858 __vm_enough_memory+0x204/0x250
[ 3160.307275][T106365] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod bnx2x ahci libahci mdio tg3 libata libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
[ 3160.307341][T106365] CPU: 103 PID: 106365 Comm: oom01 Not tainted 5.7.0-rc7-next-20200528+ #3
[ 3160.307368][T106365] NIP:  c0000000003ee654 LR: c0000000003ee650 CTR: c000000000745b40
[ 3160.307382][T106365] REGS: c0002017f940f730 TRAP: 0700   Not tainted  (5.7.0-rc7-next-20200528+)
[ 3160.307409][T106365] MSR:  900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR: 28222482  XER: 00000000
[ 3160.307442][T106365] CFAR: c00000000010e428 IRQMASK: 0
[ 3160.307442][T106365] GPR00: c0000000003ee650 c0002017f940f9c0 c00000000130a300 000000000000001b
[ 3160.307442][T106365] GPR04: c0000000017b8d68 0000000000000006 0000000078154885 ffffffff6ca32090
[ 3160.307442][T106365] GPR08: 0000201cc61a0000 0000000000000000 0000000000000000 0000000000000003
[ 3160.307442][T106365] GPR12: 0000000000002000 c000201fff675100 0000000000000000 0000000000000000
[ 3160.307442][T106365] GPR16: 0000000000000000 0000000000000000 c000200350fe3b60 fffffffffff7dfff
[ 3160.307442][T106365] GPR20: c000201a36824928 c000201a3682c128 c000200ee33ad3a0 c000200ee33ad3a8
[ 3160.307442][T106365] GPR24: c000200ee33ad390 ffffffffffff16dd 0000000000000000 0000000000000001
[ 3160.307442][T106365] GPR28: c000201a36824880 0000000000000001 c000000003fa2a80 c0000000011fb0a8
[ 3160.307723][T106365] NIP [c0000000003ee654] __vm_enough_memory+0x204/0x250
[ 3160.307759][T106365] LR [c0000000003ee650] __vm_enough_memory+0x200/0x250
[ 3160.307793][T106365] Call Trace:
[ 3160.307814][T106365] [c0002017f940f9c0] [c0000000003ee650] __vm_enough_memory+0x200/0x250 (unreliable)
[ 3160.307875][T106365] [c0002017f940fa60] [c000000000109ab8] dup_mm+0x2a8/0x700
[ 3160.307901][T106365] [c0002017f940fb10] [c00000000010b3f0] copy_process+0xeb0/0x1920
[ 3160.307927][T106365] [c0002017f940fc20] [c00000000010c1cc] _do_fork+0xac/0xb20
[ 3160.307941][T106365] [c0002017f940fd00] [c00000000010cdf8] __do_sys_clone+0x98/0xe0
[ 3160.307979][T106365] [c0002017f940fdc0] [c000000000038a88] system_call_exception+0x108/0x1d0
[ 3160.308018][T106365] [c0002017f940fe20] [c00000000000c9f0] system_call_common+0xf0/0x278
[ 3160.308054][T106365] Instruction dump:
[ 3160.308076][T106365] 60000000 60000000 60000000 73490001 4082fee4 3c62ff8c 39200001 3d42fff9
[ 3160.308128][T106365] 38632788 992a6b4a 4bd1fd75 60000000 <0fe00000> 4bfffec0 7fc3f378 483218f9
[ 3160.308158][T106365] irq event stamp: 760
[ 3160.308181][T106365] hardirqs last  enabled at (759): [<c0000000001e9838>] vprintk_emit+0x118/0x430
[ 3160.308231][T106365] hardirqs last disabled at (760): [<c00000000000963c>] program_check_common_virt+0x2bc/0x310
[ 3160.308281][T106365] softirqs last  enabled at (0): [<c00000000010ac38>] copy_process+0x6f8/0x1920
[ 3160.308297][T106365] softirqs last disabled at (0): [<0000000000000000>] 0x0
[ 3160.308310][T106365] ---[ end trace e2152aa44c190593 ]---
[ 3160.308478][T106365] KK as:-59683  as_sum:6897  check:-32768 batch:256
[ 3160.308614][T106365] KK as:-59683  as_sum:6898  check:-32768 batch:256
[ 3160.308714][T106365] KK as:-59683  as_sum:6901  check:-32768 batch:256
[ 3160.308806][T106365] KK as:-59683  as_sum:6902  check:-32768 batch:256
[ 3160.308900][T106365] KK as:-59683  as_sum:6903  check:-32768 batch:256
[ 3160.308979][T106365] KK as:-59683  as_sum:6904  check:-32768 batch:256
[ 3160.309064][T106365] KK as:-59683  as_sum:6905  check:-32768 batch:256
[ 3160.309160][T106365] KK as:-59683  as_sum:6906  check:-32768 batch:256
[ 3160.309275][T106365] KK as:-59683  as_sum:6907  check:-32768 batch:256
[ 3160.309356][T106365] KK as:-59683  as_sum:6908  check:-32768 batch:256
[ 3160.309437][T106365] KK as:-59683  as_sum:6909  check:-32768 batch:256
[ 3160.310939][T106366] KK as:-59683  as_sum:6912  check:-32768 batch:256
[ 3160.311134][T106366] KK as:-59270  as_sum:7040  check:-32768 batch:256
[ 3160.311240][T106367] KK as:-59270  as_sum:7168  check:-32768 batch:256

> 
> Thanks,
> Feng
> 
> ---
>  mm/util.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/util.c b/mm/util.c
> index 988d11e6c17c..2f3a2e0f12ae 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -797,10 +797,15 @@ EXPORT_SYMBOL_GPL(vm_memory_committed);
>  int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
>  {
>  	long allowed;
> -
> -	VM_WARN_ONCE(percpu_counter_read(&vm_committed_as) <
> +	if (percpu_counter_read(&vm_committed_as) <
> +			-(s64)vm_committed_as_batch * num_online_cpus()) {
> +		printk("as:%lld  as_sum:%lld  check:%lld batch:%d\n",
> +			percpu_counter_read(&vm_committed_as),
> +			percpu_counter_sum(&vm_committed_as),
>  			-(s64)vm_committed_as_batch * num_online_cpus(),
> -			"memory commitment underflow");
> +			vm_committed_as_batch);
> +
> +	}
>  
>  	vm_acct_memory(pages);
>  
> @@ -816,6 +821,10 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
>  		return 0;
>  	}
>  
> +	VM_WARN_ONCE(percpu_counter_read(&vm_committed_as) <
> +			-(s64)vm_committed_as_batch * num_online_cpus(),
> +			"memory commitment underflow");
> +
>  	allowed = vm_commit_limit();
>  	/*
>  	 * Reserve some for root
> -- 
> 2.14.1
> 
> > 
> > # lscpu
> > Architecture:        x86_64
> > CPU op-mode(s):      32-bit, 64-bit
> > Byte Order:          Little Endian
> > CPU(s):              48
> > On-line CPU(s) list: 0-47
> > Thread(s) per core:  1
> > Core(s) per socket:  12
> > Socket(s):           4
> > NUMA node(s):        4
> > Vendor ID:           GenuineIntel
> > CPU family:          6
> > Model:               63
> > Model name:          Intel(R) Xeon(R) CPU E5-4650 v3 @ 2.10GHz
> > Stepping:            2
> > CPU MHz:             1198.498
> > BogoMIPS:            4195.14
> > Virtualization:      VT-x
> > L1d cache:           32K
> > L1i cache:           32K
> > L2 cache:            256K
> > L3 cache:            30720K
> > NUMA node0 CPU(s):   0-5,24-29
> > NUMA node1 CPU(s):   6-11,30-35
> > NUMA node2 CPU(s):   12-17,36-41
> > NUMA node3 CPU(s):   18-23,42-47
> > 
> > # numactl -H
> > available: 4 nodes (0-3)
> > node 0 cpus: 0 1 2 3 4 5 24 25 26 27 28 29
> > node 0 size: 27768 MB
> > node 0 free: 27539 MB
> > node 1 cpus: 6 7 8 9 10 11 30 31 32 33 34 35
> > node 1 size: 32225 MB
> > node 1 free: 32009 MB
> > node 2 cpus: 12 13 14 15 16 17 36 37 38 39 40 41
> > node 2 size: 32253 MB
> > node 2 free: 32174 MB
> > node 3 cpus: 18 19 20 21 22 23 42 43 44 45 46 47
> > node 3 size: 32252 MB
> > node 3 free: 31330 MB
> > node distances:
> > node   0   1   2   3
> >   0:  10  21  21  21
> >   1:  21  10  21  21
> >   2:  21  21  10  21
> >   3:  21  21  21  10
> > 
> > > 
> > > Thanks,
> > > Feng
> > > 
> > > > > [ 3319.284456] WARNING: CPU: 13 PID: 130949 at mm/util.c:835 __vm_enough_memory+0x1dc/0x1f0
> > > > > [ 3319.284485] Modules linked in: brd ext4 crc16 mbcache jbd2 loop kvm_hv kvm ip_tables x_tables xfs sd_mod ahci libahci bnx2x libata mdio tg3 libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
> > > > > [ 3319.284538] CPU: 13 PID: 130949 Comm: oom01 Not tainted 5.7.0-rc6-next-20200521+ #115
> > > > > [ 3319.284551] NIP:  c00000000043027c LR: c000000000430278 CTR: c0000000007bd120
> > > > > [ 3319.284572] REGS: c00000064a42f710 TRAP: 0700   Not tainted  (5.7.0-rc6-next-20200521+)
> > > > > [ 3319.284602] MSR:  900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>  CR: 28222422  XER: 20040000
> > > > > [ 3319.284638] CFAR: c000000000119098 IRQMASK: 0 
> > > > >                GPR00: c000000000430278 c00000064a42f9a0 c000000001765500 000000000000001b 
> > > > >                GPR04: c00000000179c3b0 000000000000000b 0000000066726564 c00000000429ac28 
> > > > >                GPR08: 0000000000000001 0000000000000000 0000000000000000 c000001301facc80 
> > > > >                GPR12: 0000000000002000 c000001fffff3d80 0000000000000000 0000000000000000 
> > > > >                GPR16: 0000000000000000 0000000000000000 c0000014f358dd60 fffffffffff7dfff 
> > > > >                GPR20: c0000003725a9128 c0000003725a3928 c000000b0a0c0670 c000000b0a0c0678 
> > > > >                GPR24: c000000b0a0c0660 c00000064a42fa58 c000000b0a0c0650 c0000003725a9080 
> > > > >                GPR28: 0000000000000001 0000000000000000 c000000001620178 0000000000000001 
> > > > > [ 3319.284825] NIP [c00000000043027c] __vm_enough_memory+0x1dc/0x1f0
> > > > > [ 3319.284853] LR [c000000000430278] __vm_enough_memory+0x1d8/0x1f0
> > > > > [ 3319.284872] Call Trace:
> > > > > [ 3319.284889] [c00000064a42f9a0] [c000000000430278] __vm_enough_memory+0x1d8/0x1f0 (unreliable)
> > > > > [ 3319.284930] [c00000064a42fa30] [c000000000114258] dup_mm+0x2a8/0x700
> > > > > [ 3319.284960] [c00000064a42fae0] [c000000000115c7c] copy_process+0xeac/0x1a00
> > > > > [ 3319.284981] [c00000064a42fbf0] [c000000000116b3c] _do_fork+0xac/0xce0
> > > > > [ 3319.285002] [c00000064a42fd00] [c000000000117928] __do_sys_clone+0x98/0xe0
> > > > > [ 3319.285032] [c00000064a42fdc0] [c000000000039e78] system_call_exception+0x108/0x1d0
> > > > > [ 3319.285064] [c00000064a42fe20] [c00000000000c9f0] system_call_common+0xf0/0x278
> > > > > [ 3319.285093] Instruction dump:
> > > > > [ 3319.285109] 60000000 73a90001 4182000c e8be0002 4bfffeb8 3c62ff51 39200001 3d42fff9 
> > > > > [ 3319.285142] 38636690 992a6ad6 4bce8dbd 60000000 <0fe00000> e8be0002 4bfffe90 60000000 

  parent reply	other threads:[~2020-05-28 14:18 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-08  7:25 Feng Tang
2020-05-08  7:25 ` [PATCH 1/3] proc/meminfo: avoid open coded reading of vm_committed_as Feng Tang
2020-05-15  7:22   ` Michal Hocko
2020-05-08  7:25 ` [PATCH 2/3] mm/util.c: make vm_memory_committed() more accurate Feng Tang
2020-05-15  7:23   ` Michal Hocko
2020-05-15  8:11     ` Feng Tang
2020-05-15  9:04       ` Michal Hocko
2020-05-15 13:01         ` Feng Tang
2020-05-08  7:25 ` [PATCH 3/3] mm: adjust vm_committed_as_batch according to vm overcommit policy Feng Tang
2020-05-08 11:24   ` Matthew Wilcox
2020-05-08 12:33     ` Feng Tang
2020-05-15  7:41   ` Michal Hocko
2020-05-15  8:02     ` Feng Tang
2020-05-15  9:08       ` Michal Hocko
2020-05-15 11:26         ` Feng Tang
2020-05-15  7:44   ` Michal Hocko
2020-05-15  8:38     ` Feng Tang
2020-05-21 21:27 ` [PATCH 0/3] make vm_committed_as_batch aware of " Qian Cai
2020-05-26 18:14   ` Qian Cai
2020-05-27  1:14     ` Andi Kleen
2020-05-27  1:43       ` Feng Tang
2020-05-27  1:46     ` Feng Tang
2020-05-27  2:25       ` Qian Cai
2020-05-27 10:46         ` Feng Tang
2020-05-27 12:05           ` Qian Cai
2020-05-27 13:33             ` Feng Tang
2020-05-27 15:42               ` Qian Cai
2020-05-28 14:18           ` Qian Cai [this message]
2020-05-28 15:10             ` Feng Tang
2020-05-28 15:21               ` Kleen, Andi
2020-05-29 15:43                 ` Feng Tang
2020-05-29 15:50                   ` Andi Kleen
2020-05-29 16:04                     ` Feng Tang
2020-05-28 15:48               ` Michal Hocko

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