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From: "Qiu, Michael" <michael.qiu@intel.com>
To: "Tan, Jianfeng" <jianfeng.tan@intel.com>, "dev@dpdk.org" <dev@dpdk.org>
Thread-Topic: [dpdk-dev] [PATCH v3] mem: calculate space left in a hugetlbfs
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Date: Mon, 21 Dec 2015 08:34:05 +0000
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Subject: Re: [dpdk-dev] [PATCH v3] mem: calculate space left in a hugetlbfs
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On 2015/11/18 17:42, Jianfeng Tan wrote:=0A=
> Currently DPDK does not respect the quota of a hugetblfs mount.=0A=
> It will fail to init the EAL because it tries to map the number of=0A=
> free hugepages in the system rather than using the number specified=0A=
> in the quota for that mount.=0A=
>=0A=
> To solve this issue, we take the quota into consideration when=0A=
> calculating the number of hugepages to map.  We use either the number=0A=
> specified in the quota, or number of available hugepages, whichever=0A=
> is lower.=0A=
>=0A=
> There are possible race conditions when multiple applications=0A=
> allocate hugepages in different hugetlbfs mounts of the same size,=0A=
> so the suggested system would have a pool with enough hugepages for=0A=
> all hugetlbfs mount quotas.=0A=
>=0A=
> There is, however, still an open issue with=0A=
> CONFIG_RTE_EAL_SINGLE_FILE_SEGMENTS. When this option is enabled=0A=
> (IVSHMEM target does this by default), having hugetlbfs mounts with=0A=
> quota will fail to remap hugepages because it relies on having=0A=
> mapped all free hugepages in the system.=0A=
>=0A=
> Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>=0A=
>=0A=
=0A=
Acked-by: Michael Qiu <michael.qiu@intel.com>=0A=