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Message-ID: <CAE9FiQU2pJfCTmZjMG7SggjBZUfsnBArhGCxhaKQSZCojwfZPQ@mail.gmail.com>
Date: Mon, 7 May 2012 12:23:13 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Johannes Weiner <hannes@...xchg.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Gavin Shan <shangw@...ux.vnet.ibm.com>,
David Miller <davem@...emloft.net>, Tejun Heo <tj@...nel.org>,
linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 08/10] mm: nobootmem: unify allocation policy of
(non-)panicking node allocations
On Mon, May 7, 2012 at 4:37 AM, Johannes Weiner <hannes@...xchg.org> wrote:
> While the panicking node-specific allocation function tries to satisfy
> node+goal, goal, node, anywhere, the non-panicking function still does
> node+goal, goal, anywhere.
>
> Make it simpler: define the panicking version in terms of the
> non-panicking one, like the node-agnostic interface, so they always
> behave the same way apart from how to deal with allocation failure.
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> ---
> mm/nobootmem.c | 106 +++++++++++++++++++++++++++++---------------------------
> 1 file changed, 54 insertions(+), 52 deletions(-)
>
> diff --git a/mm/nobootmem.c b/mm/nobootmem.c
> index b078ff8..77069bb 100644
> --- a/mm/nobootmem.c
> +++ b/mm/nobootmem.c
> @@ -275,6 +275,57 @@ void * __init __alloc_bootmem(unsigned long size, unsigned long align,
> return ___alloc_bootmem(size, align, goal, limit);
> }
>
> +static void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
> + unsigned long size,
> + unsigned long align,
> + unsigned long goal,
> + unsigned long limit)
> +{
> + void *ptr;
> +
> +again:
> + ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
> + goal, limit);
> + if (ptr)
> + return ptr;
> +
> + ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
> + goal, limit);
> + if (ptr)
> + return ptr;
> +
> + if (goal) {
> + goal = 0;
> + goto again;
> + }
> +
> + return NULL;
> +}
> +
> +void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
> + unsigned long align, unsigned long goal)
> +{
> + if (WARN_ON_ONCE(slab_is_available()))
> + return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
> +
> + return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
> +}
> +
> +void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
> + unsigned long align, unsigned long goal,
> + unsigned long limit)
> +{
> + void *ptr;
> +
> + ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, limit);
> + if (ptr)
> + return ptr;
> +
> + printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
> + panic("Out of memory");
> + return NULL;
> +}
> +
> /**
> * __alloc_bootmem_node - allocate boot memory from a specific node
> * @pgdat: node to allocate from
> @@ -293,30 +344,10 @@ void * __init __alloc_bootmem(unsigned long size, unsigned long align,
> void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
> unsigned long align, unsigned long goal)
> {
> - void *ptr;
> -
> if (WARN_ON_ONCE(slab_is_available()))
> return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
>
> -again:
> - ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
> - goal, -1ULL);
> - if (ptr)
> - return ptr;
> -
> - ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
> - goal, -1ULL);
> - if (ptr)
> - return ptr;
> -
> - if (goal) {
> - goal = 0;
> - goto again;
> - }
> -
> - printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
> - panic("Out of memory");
> - return NULL;
> + return ___alloc_bootmem_node(pgdat, size, align, goal, 0);
> }
>
> void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
> @@ -347,22 +378,6 @@ void * __init alloc_bootmem_section(unsigned long size,
> }
> #endif
>
> -void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
> - unsigned long align, unsigned long goal)
> -{
> - void *ptr;
> -
> - if (WARN_ON_ONCE(slab_is_available()))
> - return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
> -
> - ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
> - goal, -1ULL);
> - if (ptr)
> - return ptr;
> -
> - return __alloc_bootmem_nopanic(size, align, goal);
> -}
> -
> #ifndef ARCH_LOW_ADDRESS_LIMIT
> #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
> #endif
> @@ -404,22 +419,9 @@ void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
> void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
> unsigned long align, unsigned long goal)
> {
> - void *ptr;
> -
> if (WARN_ON_ONCE(slab_is_available()))
> return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
>
> - ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
> - goal, ARCH_LOW_ADDRESS_LIMIT);
> - if (ptr)
> - return ptr;
> -
> - ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align,
> - goal, ARCH_LOW_ADDRESS_LIMIT);
> - if (ptr)
> - return ptr;
> -
> - printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
> - panic("Out of memory");
> - return NULL;
> + return ___alloc_bootmem_node(pgdat, size, align, goal,
> + ARCH_LOW_ADDRESS_LIMIT);
> }
> --
Acked-by: Yinghai Lu <yinghai@...nel.org>
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