RE: Linux and huge pages
- From: <Christopher.Taylor2@xxxxxxxxxxxx>
- To: <yong321@xxxxxxxxx>, <Mark.Bobak@xxxxxxxxxxxx>
- Date: Thu, 24 Jan 2013 10:06:43 -0600
Oh I just realized in Yong's example, it actually lists the page size :)
I'm not on 2.6.29 tho so that entry is not in my smaps. So perhaps my
deduction would work on previous kernel versions - not sure.
Chris
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Yong Huang
Sent: Thursday, January 24, 2013 9:43 AM
To: Mark.Bobak@xxxxxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: Linux and huge pages
> Unfortunately, if you're looking to directly confirm whether a
> particular memory segment was allocated with hugepages, I know of no
> way to do that.
There's no v$ or x$ table for this info, but /proc/<pid>/smaps has
KernelPageSize and MMUPageSize if your kernel is new enough, probably 2.6.29 or
newer. For example, the following shows a shared memory segment of about 37GB
using 2MB page size of HugePages.
70000000-960000000 rwxs 00000000 00:0c 1179654
/SYSV00000000 (deleted)
Size: 37486592 kB
Rss: 0 kB
Pss: 0 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 0 kB
Referenced: 0 kB
Anonymous: 0 kB
AnonHugePages: 0 kB
Swap: 0 kB
KernelPageSize: 2048 kB
MMUPageSize: 2048 kB
Regarding the kernel version, my note says "[when] this patch is in your
kernel: http://lkml.org/lkml/2008/10/3/250. That patch may be in kernel 2.6.29
(http://www.kernel.org/pub/linux/kernel/v2.6/)".
Yong Huang
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