From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>, dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 2/2] memalloc: keep in mind a failed MAP_FIXED mmap may still perform an unmap
Date: Fri, 1 Jun 2018 12:08:33 +0100 [thread overview]
Message-ID: <124961f4-c55f-10e6-7f5c-c0767f3b0bd4@intel.com> (raw)
In-Reply-To: <1527857469-159391-2-git-send-email-dariuszx.stojaczyk@intel.com>
On 01-Jun-18 1:51 PM, Dariusz Stojaczyk wrote:
> This isn't documented in the manuals, but a failed
> mmap(..., MAP_FIXED) may still unmap overlapping
> regions. In such case, we need to remap these regions
> back into our address space to ensure mem contiguity.
> We do it unconditionally now on mmap failure just to
> be safe.
>
> Verified on Linux 4.9.0-4-amd64. I was getting
> ENOMEM when trying to map in hugetlbfs with no space
> left, but the previous anonymous mapping was still
> being removed.
>
> Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com>
> ---
Does this also happen with other error values?
--
Thanks,
Anatoly
next prev parent reply other threads:[~2018-06-01 11:08 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-01 12:51 [dpdk-dev] [PATCH 1/2] memalloc: do not leave unmapped holes in EAL virtual memory area Dariusz Stojaczyk
2018-06-01 11:00 ` Burakov, Anatoly
2018-06-01 12:22 ` Stojaczyk, DariuszX
2018-06-01 14:59 ` Burakov, Anatoly
2018-06-01 12:51 ` [dpdk-dev] [PATCH 2/2] memalloc: keep in mind a failed MAP_FIXED mmap may still perform an unmap Dariusz Stojaczyk
2018-06-01 11:08 ` Burakov, Anatoly [this message]
2018-06-01 12:41 ` Stojaczyk, DariuszX
2018-06-01 13:37 ` [dpdk-dev] [PATCH 1/2] memalloc: do not leave unmapped holes in EAL virtual memory area Dariusz Stojaczyk
2018-06-01 13:39 ` [dpdk-dev] [PATCH v2 " Dariusz Stojaczyk
2018-06-01 10:24 ` Stojaczyk, DariuszX
2018-06-01 11:14 ` Burakov, Anatoly
2018-06-01 12:59 ` [dpdk-dev] [PATCH v3 " Dariusz Stojaczyk
2018-06-01 12:59 ` [dpdk-dev] [PATCH v3 2/2] memalloc: keep in mind a failed MAP_FIXED mmap may still perform an unmap Dariusz Stojaczyk
2018-06-01 15:07 ` Burakov, Anatoly
2018-06-01 15:06 ` [dpdk-dev] [PATCH v3 1/2] memalloc: do not leave unmapped holes in EAL virtual memory area Burakov, Anatoly
2018-07-12 21:42 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
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