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From: Thomas Monjalon <thomas@monjalon.net>
To: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Cc: dev@dpdk.org, "Burakov, Anatoly" <anatoly.burakov@intel.com>,
	stable@dpdk.org
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH] malloc: respect SIZE_HINT_ONLY when looking for the biggest free elem
Date: Sun, 28 Oct 2018 11:50:52 +0100	[thread overview]
Message-ID: <2067770.0L7xP8buvR@xps> (raw)
In-Reply-To: <522e80af-e19e-2e5c-f1f1-6fd34075cf76@intel.com>

08/10/2018 11:02, Burakov, Anatoly:
> On 07-Oct-18 8:31 PM, Darek Stojaczyk wrote:
> > RTE_MEMZONE_SIZE_HINT_ONLY wasn't checked in any way,
> > causing size hints to be parsed as hard requirements.
> > This resulted in some allocations being failed prematurely.
> > 
> > Fixes: 68b6092bd3c7 ("malloc: allow reserving biggest element")
> > Cc: anatoly.burakov@intel.com
> > Cc: stable@dpdk.org
> > 
> > Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
> > ---
> >   lib/librte_eal/common/malloc_heap.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/lib/librte_eal/common/malloc_heap.c b/lib/librte_eal/common/malloc_heap.c
> > index ac7bbb3ba..d2a8bd8dc 100644
> > --- a/lib/librte_eal/common/malloc_heap.c
> > +++ b/lib/librte_eal/common/malloc_heap.c
> > @@ -165,7 +165,9 @@ find_biggest_element(struct malloc_heap *heap, size_t *size,
> >   		for (elem = LIST_FIRST(&heap->free_head[idx]);
> >   				!!elem; elem = LIST_NEXT(elem, free_list)) {
> >   			size_t cur_size;
> > -			if (!check_hugepage_sz(flags, elem->msl->page_sz))
> > +			if ((flags & RTE_MEMZONE_SIZE_HINT_ONLY) == 0 &&
> > +					!check_hugepage_sz(flags,
> > +						elem->msl->page_sz))
> >   				continue;
> 
> Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>
> 
> Although to be frank, the whole concept of "reserving biggest available 
> memzone" is currently broken because of dynamic memory allocation. There 
> is currently no way to allocate "as many hugepages as you can", so we're 
> only looking at memory already allocated, which in the general case is 
> less than page size long (unless you use legacy mode or memory 
> preallocation switches).

Applied anyway, thanks

      reply	other threads:[~2018-10-28 10:50 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-07 19:31 [dpdk-stable] " Darek Stojaczyk
2018-10-08  9:02 ` Burakov, Anatoly
2018-10-28 10:50   ` Thomas Monjalon [this message]

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