From: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
To: Fidaullah Noonari <fidaullah.noonari@emumba.com>
Cc: Anatoly Burakov <anatoly.burakov@intel.com>, dpdk-dev <dev@dpdk.org>
Subject: Re: [PATCH] eal: fixes the bug where rte_malloc() fails to allocates memory
Date: Sat, 18 Jun 2022 14:29:34 +0300 [thread overview]
Message-ID: <CAEYuUWCnRZNwxiOHEeTHw0Gy9aFJRLZtvAG9g=smuUvUEMcFXg@mail.gmail.com> (raw)
In-Reply-To: <20220525051837.247255-1-fidaullah.noonari@emumba.com>
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Hi Fidaullah,
Thanks for the fix,
Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Anatoly, I noticed a couple of other things while testing this.
1. Consider:
elt_size = pg_sz - MALLOC_ELEM_OVERHEAD
rte_malloc(align=0) which is converted to align = 1.
Obviously, such an element fits into one page, however:
alloc_sz = RTE_ALIGN_CEIL(1 + pg_sz +
(MALLOC_ELEM_OVERHEAD - MALLOC_ELEM_OVERHEAD),
pg_sz) == 2 * pg_sz.
This can unnecessarily hit an allocation limit from the system or EAL.
I suggest, in both places:
alloc_sz = RTE_ALIGN_CEIL(RTE_ALIGN_CEIL(elt_size, align) +
MALLOC_ELEM_OVERHEAD, pg_sz);
This would be symmetric with malloc_elem_can_hold().
2. Alignment calculation depends on whether we allocated new pages or not:
malloc_heap_alloc_on_heap_id(align = 0) ->
heap_alloc(align = 1) ->
find_suitable_element(align = RTE_CACHE_LINE_ROUNDUP(align))
malloc_heap_alloc_on_heap_id(align = 0) ->
alloc_more_mem_on_socket(align = 1) ->
try_expand_heap() -> ... ->
alloc_pages_on_heap(align = 1) ->
find_suitable_element(align = 1)
Why do we call find_suitable_element() directly and not just return
and repeat the heap_alloc() attempt?
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next prev parent reply other threads:[~2022-06-18 11:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-25 5:18 Fidaullah Noonari
2022-06-16 7:53 ` David Marchand
2022-06-18 11:29 ` Dmitry Kozlyuk [this message]
2022-06-22 17:03 ` David Marchand
2022-06-22 21:18 ` Dmitry Kozlyuk
2022-07-05 5:04 ` Fidaullah Noonari
2022-06-23 7:50 ` David Marchand
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