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From: David Marchand <david.marchand@redhat.com>
To: Roy Shterman <roy.shterman@vastdata.com>
Cc: dev <dev@dpdk.org>,
	"Burakov, Anatoly" <anatoly.burakov@intel.com>,
	 Yuval Mintz <yuval@vastdata.com>,
	Aviv Ben David <aviv.bendavid@vastdata.com>,
	 dpdk stable <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] mem: fix free segment when using huge-unlink option
Date: Wed, 7 Apr 2021 11:09:46 +0200
Message-ID: <CAJFAV8xKWTxxS7HUVPKvjDzhemx35ryQyLyBqhty5E3TwimfVQ@mail.gmail.com> (raw)
In-Reply-To: <63d59764-3a86-6b7d-97c3-28a8d1a6eebb@intel.com>

On Thu, Apr 1, 2021 at 1:07 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()
falsely*

> > although we have hugepages available.
> >
> > Fixes: d435aad37da7 ("mem: support --huge-unlink mode")
Cc: stable@dpdk.org

> >
> > Signed-off-by: Roy Shterman <roy.shterman@vastdata.com>
> Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>

Applied, thanks.


-- 
David Marchand


      reply	other threads:[~2021-04-07  9:10 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
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 [this message]

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