[question] hugetlb: how to find who use hugetlb?

[question] hugetlb: how to find who use hugetlb?

[Xishi Qiu]

On my system, I set HugePages_Total to 2G(1024 x 2M), and I use 1G hugetlb,
but the HugePages_Free is not 1G(512 x 2M), it is 280(280 x 2M) left,
HugePages_Rsvd is 0, it seems someone use 232(232 x 2M) hugetlb additionally.

So how to find who use the additional hugetlb? 

I search every process and find the total hugetlb size is only 1G,
cat /proc/xx/smaps | grep KernelPageSize, then account the vma size
which KernelPageSize is 2048 kB.

Thanks,
Xishi Qiu

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Re: [question] hugetlb: how to find who use hugetlb?

[Xishi Qiu]

On 2016/9/19 10:39, Xishi Qiu wrote:

> On my system, I set HugePages_Total to 2G(1024 x 2M), and I use 1G hugetlb,
> but the HugePages_Free is not 1G(512 x 2M), it is 280(280 x 2M) left,
> HugePages_Rsvd is 0, it seems someone use 232(232 x 2M) hugetlb additionally.
> 
> So how to find who use the additional hugetlb? 
> 
> I search every process and find the total hugetlb size is only 1G,
> cat /proc/xx/smaps | grep KernelPageSize, then account the vma size
> which KernelPageSize is 2048 kB.
> 
> Thanks,
> Xishi Qiu
> 

I kill the processes which use hugetlb, and set 0 to nr_hugepages.
My kernel version is v3.10

meminfo:
HugePages_Total:     232
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:      232
Hugepagesize:       2048 kB

"cat /proc/*/smaps | grep KernelPageSize| grep 2048" shows nothing.

linux-ZSfbIr:/home # mount | grep hugetlb
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)
nodev on /dev/hugepages type hugetlbfs (rw,relatime)

linux-ZSfbIr:/home # ll /dev/hugepages/
total 0

linux-ZSfbIr:/home # ll /sys/fs/cgroup/hugetlb/
total 0
-rw-r--r-- 1 root root 0 Sep 13 08:10 cgroup.clone_children
--w--w--w- 1 root root 0 Sep 13 08:10 cgroup.event_control
-rw-r--r-- 1 root root 0 Sep 13 08:10 cgroup.procs
-r--r--r-- 1 root root 0 Sep 13 08:10 cgroup.sane_behavior
-rw-r--r-- 1 root root 0 Sep 13 08:10 hugetlb.1GB.failcnt
-rw-r--r-- 1 root root 0 Sep 13 08:10 hugetlb.1GB.limit_in_bytes
-rw-r--r-- 1 root root 0 Sep 13 08:10 hugetlb.1GB.max_usage_in_bytes
-r--r--r-- 1 root root 0 Sep 13 08:10 hugetlb.1GB.usage_in_bytes
-rw-r--r-- 1 root root 0 Sep 13 08:10 hugetlb.2MB.failcnt
-rw-r--r-- 1 root root 0 Sep 13 08:10 hugetlb.2MB.limit_in_bytes
-rw-r--r-- 1 root root 0 Sep 13 08:10 hugetlb.2MB.max_usage_in_bytes
-r--r--r-- 1 root root 0 Sep 13 08:10 hugetlb.2MB.usage_in_bytes
-rw-r--r-- 1 root root 0 Sep 13 08:10 notify_on_release
-rw-r--r-- 1 root root 0 Sep 13 08:10 release_agent
-rw-r--r-- 1 root root 0 Sep 13 08:10 tasks
linux-ZSfbIr:/home #

> 
> 



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Re: [question] hugetlb: how to find who use hugetlb?

[Hillf Danton]

> > So how to find who use the additional hugetlb?
> > 
Take a peek please at 5d317b2b653 
("mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status")

Hillf


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Re: [question] hugetlb: how to find who use hugetlb?

[Xishi Qiu]

On 2016/9/20 12:05, Hillf Danton wrote:

>>> So how to find who use the additional hugetlb?
>>>
> Take a peek please at 5d317b2b653 
> ("mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status")
> 
> Hillf
> 

Hi Hillf,

This patch add the count of hugetlb for each process.
If someone use hugetlb, "cat /proc/*/smaps | grep KernelPageSize| grep 2048"
will show something, right? But now it is nothing, and /dev/hugepages is empty.

Thanks,
Xishi Qiu

> 
> 
> 



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Re: [question] hugetlb: how to find who use hugetlb?

[Hillf Danton]

> 
> If someone use hugetlb, "cat /proc/*/smaps | grep KernelPageSize| grep 2048"
> will show something, right? But now it is nothing, and /dev/hugepages is empty.
> 
With 4.7 or 4.8-rc7?

thanks
Hillf

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Re: [question] hugetlb: how to find who use hugetlb?

[Xishi Qiu]

On 2016/9/20 14:47, Hillf Danton wrote:

>>
>> If someone use hugetlb, "cat /proc/*/smaps | grep KernelPageSize| grep 2048"
>> will show something, right? But now it is nothing, and /dev/hugepages is empty.
>>
> With 4.7 or 4.8-rc7?
> 

RHEL 7.1 (kernel version is v3.10)

> thanks
> Hillf
> 
> 
> 



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Re: [question] hugetlb: how to find who use hugetlb?

[Hillf Danton]

> >>
> >> If someone use hugetlb, "cat /proc/*/smaps | grep KernelPageSize| grep 2048"
> >> will show something, right? But now it is nothing, and /dev/hugepages is empty.
> >>
> > With 4.7 or 4.8-rc7?
> 
> RHEL 7.1 (kernel version is v3.10)
> 
Then please deliver the issue directly to your distributor and wait for feedback. 

thanks
Hillf


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