From: Roy Shterman <roy.shterman@vastdata.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>
Cc: dev@dpdk.org, Yuval Mintz <yuval@vastdata.com>,
Aviv Ben David <aviv.bendavid@vastdata.com>
Subject: Re: [dpdk-dev] [PATCH] mem: fix free segment when using huge-unlink option
Date: Sun, 28 Feb 2021 15:21:36 +0200 [thread overview]
Message-ID: <CAJ5KnGAWmNnWdSrzyGF2hfxYJrUEn_df8SWn1yKhG_swBrivOw@mail.gmail.com> (raw)
In-Reply-To: <ba9df18a-036f-dbd4-b19f-2f5faec43acc@intel.com>
On Mon, Feb 22, 2021 at 5:53 PM Burakov, Anatoly <anatoly.burakov@intel.com>
wrote:
> On 22-Feb-21 10:41 AM, Roy Shterman wrote:
> > When using huge_unlink we unlink the segment right
> > after allocation. Although we unlink the file we keep
> > the fd in fd_list so file still exist just the path deleted.
> > When freeing the hugepage we need to close the fd and assign
> > it with (-1) in fd_list for the page to be released.
> >
> > The current flow fails rte_malloc in the following flow when working
> > with --huge-unlink option:
> > 1. alloc_seg() for segment A -
> > We allocate segment, unlink the path to the segment
> > and keep the file descriptor in fd_list.
> > 2. free_seg() for segment A -
> > We clear the segment metadata and return - without closing fd
> > or assigning (-1) in fd list.
> > 3. alloc_seg() for segment A again -
> > We find segment A as available, try to allocate it,
> > find the old fd in fd_list try to unlink it
> > as part of alloc_seg() but failed because path doesn't exist.
> >
> > The impact of such error is falsly failing rte_malloc()
> > although we have hugepages available.
> >
> > Fixes: d435aad37da7 ("mem: support --huge-unlink mode")
> >
> > Signed-off-by: Roy Shterman <roy.shterman@vastdata.com>
>
> Cc: stable@dpdk.org
>
> Provisionally, patch looks fine, but i'll have to have a closer look.
>
Hi Anatoly,
Do I need to send this patch also to stable or it will happen automatically
if the patch will reach the next release candidate?
Also I wonder if you had more time to review this one?
>
> --
> Thanks,
> Anatoly
>
Thanks,
Roy
next prev parent reply other threads:[~2021-02-28 14:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-22 10:41 Roy Shterman
2021-02-22 15:53 ` Burakov, Anatoly
2021-02-28 13:21 ` Roy Shterman [this message]
2021-03-01 10:44 ` Burakov, Anatoly
2021-03-25 13:34 ` [dpdk-dev] [dpdk-stable] " David Marchand
2021-04-01 11:07 ` [dpdk-dev] " Burakov, Anatoly
2021-04-07 9:09 ` David Marchand
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