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Date: Tue, 03 Jun 2008 22:59:16 +0900
From: Yasunori Goto <y-goto@...fujitsu.com>
To: Johannes Weiner <hannes@...urebad.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
Yinghai Lu <yhlu.kernel@...il.com>,
Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 11/14] bootmem: respect goal more likely
Hmm, my ia64 (NUMA) box can't boot up with this patch.
I'll chase its cause deeply tomorrow.
Bye.
> The old node-agnostic code tried allocating on all nodes starting from
> the one with the lowest range. alloc_bootmem_core retried without the
> goal if it could not satisfy it and so the goal was only respected at
> all when it happened to be on the first (lowest page numbers) node (or
> theoretically if allocations failed on all nodes before to the one
> holding the goal).
>
> Introduce a non-panicking helper that starts allocating from the node
> holding the goal and falls back only after all these tries failed.
>
> Make all other allocation helpers benefit from this new helper.
>
> Signed-off-by: Johannes Weiner <hannes@...urebad.de>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Yinghai Lu <yhlu.kernel@...il.com>
> CC: Andi Kleen <andi@...stfloor.org>
> ---
>
> mm/bootmem.c | 90 ++++++++++++++++++++++++++++++++++-------------------------
> 1 file changed, 52 insertions(+), 38 deletions(-)
>
> --- a/mm/bootmem.c
> +++ b/mm/bootmem.c
> @@ -408,6 +408,7 @@ static void * __init alloc_bootmem_core(
> unsigned long size, unsigned long align,
> unsigned long goal, unsigned long limit)
> {
> + unsigned long fallback = 0;
> unsigned long min, max, start, step;
>
> BUG_ON(!size);
> @@ -441,10 +442,11 @@ static void * __init alloc_bootmem_core(
>
> max -= PFN_DOWN(bdata->node_boot_start);
> start -= PFN_DOWN(bdata->node_boot_start);
> + fallback -= PFN_DOWN(bdata->node_boot_start);
>
> if (bdata->last_success > start) {
> - /* Set goal here to trigger a retry on failure */
> - start = goal = ALIGN(bdata->last_success, step);
> + fallback = start;
> + start = ALIGN(bdata->last_success, step);
> }
>
> while (1) {
> @@ -491,10 +493,39 @@ find_block:
> return region;
> }
>
> + if (fallback) {
> + start = ALIGN(fallback, step);
> + fallback = 0;
> + goto find_block;
> + }
> +
> + return NULL;
> +}
> +
> +static void * __init ___alloc_bootmem_nopanic(unsigned long size,
> + unsigned long align,
> + unsigned long goal,
> + unsigned long limit)
> +{
> + bootmem_data_t *bdata;
> +
> +restart:
> + list_for_each_entry(bdata, &bdata_list, list) {
> + void *region;
> +
> + if (goal && goal < bdata->node_boot_start)
> + continue;
> + if (limit && limit < bdata->node_boot_start)
> + continue;
> +
> + region = alloc_bootmem_core(bdata, size, align, goal, limit);
> + if (region)
> + return region;
> + }
> +
> if (goal) {
> goal = 0;
> - start = 0;
> - goto find_block;
> + goto restart;
> }
>
> return NULL;
> @@ -514,16 +545,23 @@ find_block:
> * Returns NULL on failure.
> */
> void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
> - unsigned long goal)
> + unsigned long goal)
> {
> - bootmem_data_t *bdata;
> - void *ptr;
> + return ___alloc_bootmem_nopanic(size, align, goal, 0);
> +}
>
> - list_for_each_entry(bdata, &bdata_list, list) {
> - ptr = alloc_bootmem_core(bdata, size, align, goal, 0);
> - if (ptr)
> - return ptr;
> - }
> +static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
> + unsigned long goal, unsigned long limit)
> +{
> + void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
> +
> + if (mem)
> + return mem;
> + /*
> + * Whoops, we cannot satisfy the allocation request.
> + */
> + printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
> + panic("Out of memory");
> return NULL;
> }
>
> @@ -543,16 +581,7 @@ void * __init __alloc_bootmem_nopanic(un
> void * __init __alloc_bootmem(unsigned long size, unsigned long align,
> unsigned long goal)
> {
> - void *mem = __alloc_bootmem_nopanic(size,align,goal);
> -
> - if (mem)
> - return mem;
> - /*
> - * Whoops, we cannot satisfy the allocation request.
> - */
> - printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
> - panic("Out of memory");
> - return NULL;
> + return ___alloc_bootmem(size, align, goal, 0);
> }
>
> #ifndef ARCH_LOW_ADDRESS_LIMIT
> @@ -575,22 +604,7 @@ void * __init __alloc_bootmem(unsigned l
> void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
> unsigned long goal)
> {
> - bootmem_data_t *bdata;
> - void *ptr;
> -
> - list_for_each_entry(bdata, &bdata_list, list) {
> - ptr = alloc_bootmem_core(bdata, size, align, goal,
> - ARCH_LOW_ADDRESS_LIMIT);
> - if (ptr)
> - return ptr;
> - }
> -
> - /*
> - * Whoops, we cannot satisfy the allocation request.
> - */
> - printk(KERN_ALERT "low bootmem alloc of %lu bytes failed!\n", size);
> - panic("Out of low memory");
> - return NULL;
> + return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
> }
>
> /**
>
> --
>
--
Yasunori Goto
--
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