mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-23 09:19:51 +00:00
Code Issues Releases Wiki Activity

[SPARC64]: Document and fix calculation of pages_avail.

Browse source 
It should be set to the total number of pages that the
system will really have available after things like
initmem, the bootmem map, and initrd are freed up.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-03-15 22:52:18 -07:00
parent 0f3e25049e
commit f1cfdb55f1
1 changed files with 23 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
arch/sparc64/mm/init.c
View file

@ -938,6 +938,20 @@ static void __init trim_pavail(unsigned long *cur_size_p,
}
}
/* About pages_avail, this is the value we will use to calculate
* the zholes_size[] argument given to free_area_init_node(). The
* page allocator uses this to calculate nr_kernel_pages,
* nr_all_pages and zone->present_pages. On NUMA it is used
* to calculate zone->min_unmapped_pages and zone->min_slab_pages.
*
* So this number should really be set to what the page allocator
* actually ends up with. This means:
* 1) It should include bootmem map pages, we'll release those.
* 2) It should not include the kernel image, except for the
* __init sections which we will also release.
* 3) It should include the initrd image, since we'll release
* that too.
*/
static unsigned long __init bootmem_init(unsigned long *pages_avail,
unsigned long phys_base)
{
@ -1024,7 +1038,6 @@ static unsigned long __init bootmem_init(unsigned long *pages_avail,
initrd_start, initrd_end);
#endif
reserve_bootmem(initrd_start, size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
initrd_start += PAGE_OFFSET;
initrd_end += PAGE_OFFSET;
@ -1037,6 +1050,11 @@ static unsigned long __init bootmem_init(unsigned long *pages_avail,
reserve_bootmem(kern_base, kern_size);
*pages_avail -= PAGE_ALIGN(kern_size) >> PAGE_SHIFT;
/* Add back in the initmem pages. */
size = ((unsigned long)(__init_end) & PAGE_MASK) -
PAGE_ALIGN((unsigned long)__init_begin);
*pages_avail += size >> PAGE_SHIFT;
/* Reserve the bootmem map. We do not account for it
* in pages_avail because we will release that memory
* in free_all_bootmem.
@ -1047,7 +1065,6 @@ static unsigned long __init bootmem_init(unsigned long *pages_avail,
(bootmap_pfn << PAGE_SHIFT), size);
#endif
reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
*pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
for (i = 0; i < pavail_ents; i++) {
unsigned long start_pfn, end_pfn;
@ -1539,6 +1556,10 @@ void __init mem_init(void)
#ifdef CONFIG_DEBUG_BOOTMEM
prom_printf("mem_init: Calling free_all_bootmem().\n");
#endif
/* We subtract one to account for the mem_map_zero page
* allocated below.
*/
totalram_pages = num_physpages = free_all_bootmem() - 1;
/*