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From: "Du, Fan" <fan.du@intel.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Thread-Topic: huge page didn't get freed when dpdk-app exit(or killed)
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Date: Mon, 15 Jun 2015 08:46:49 +0000
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Subject: [dpdk-dev] huge page didn't get freed when dpdk-app exit(or killed)
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Hi,

I play OpenvSwitch dpdk, when ovs-vswitchd got killed, it won't free up any=
 allocated huge pages, shown by below:
# tail /proc/meminfo
HardwareCorrupted:     0 kB
AnonHugePages:    106496 kB
HugePages_Total:       8
HugePages_Free:        6
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:    1048576 kB

DPDK setup hugepage by below steps, in function rte_eal_hugepage_init
*  1. map N huge pages in separate files in hugetlbfs
 *  2. find associated physical addr
 *  3. find associated NUMA socket ID
 *  4. sort all huge pages by physical address
 *  5. remap these N huge pages in the correct order
 *  6. unmap the first mapping
 *  7. fill memsegs in configuration with contiguous zones

So my env shows below when allocated 2G huge pages.
# ls /dev/hugepages/
libvirt  rtemap_4  rtemap_7

So in scenario where dpdk app is stop, but hugepage will be used by other n=
on-dpdk app,
Would current dpdk huge page behavior(not freed huge page when app exited) =
be a problem?

I found out this patch: http://dpdk.org/dev/patchwork/patch/993/ tries to p=
rovide an interface,
It didn't get merged with additional implementation modification.
Then is there any follow ups for this issue? A pointer will be much appreci=
ated!
Thanks!