lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[POWERPC] Add hugepagesz boot-time parameter

Browse Source 
This adds the hugepagesz boot-time parameter for ppc64.  It lets one
pick the size for huge pages.  The choices available are 64K and 16M
when the base page size is 4k.  It defaults to 16M (previously the
only only choice) if nothing or an invalid choice is specified.

Tested 64K huge pages successfully with the libhugetlbfs 1.2.

Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Jon Tollefson
2008-01-04 09:59:50 +11:00
committed by Paul Mackerras
parent 5b14e5f9dd
commit 4ec161cf73
4 changed files with 98 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

119
arch/powerpc/mm/hugetlbpage.c
View File

@@ -24,18 +24,17 @@
#include <asm/cputable.h>
#include <asm/spu.h>
#define HPAGE_SHIFT_64K 16
#define HPAGE_SHIFT_16M 24
#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
#define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT)
#ifdef CONFIG_PPC_64K_PAGES
#define HUGEPTE_INDEX_SIZE (PMD_SHIFT-HPAGE_SHIFT)
#else
#define HUGEPTE_INDEX_SIZE (PUD_SHIFT-HPAGE_SHIFT)
#endif
#define PTRS_PER_HUGEPTE (1 << HUGEPTE_INDEX_SIZE)
#define HUGEPTE_TABLE_SIZE (sizeof(pte_t) << HUGEPTE_INDEX_SIZE)
unsigned int hugepte_shift;
#define PTRS_PER_HUGEPTE (1 << hugepte_shift)
#define HUGEPTE_TABLE_SIZE (sizeof(pte_t) << hugepte_shift)
#define HUGEPD_SHIFT (HPAGE_SHIFT + HUGEPTE_INDEX_SIZE)
#define HUGEPD_SHIFT (HPAGE_SHIFT + hugepte_shift)
#define HUGEPD_SIZE (1UL << HUGEPD_SHIFT)
#define HUGEPD_MASK (~(HUGEPD_SIZE-1))
@@ -82,11 +81,35 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp,
return 0;
}
/* Base page size affects how we walk hugetlb page tables */
#ifdef CONFIG_PPC_64K_PAGES
#define hpmd_offset(pud, addr) pmd_offset(pud, addr)
#define hpmd_alloc(mm, pud, addr) pmd_alloc(mm, pud, addr)
#else
static inline
pmd_t *hpmd_offset(pud_t *pud, unsigned long addr)
{
if (HPAGE_SHIFT == HPAGE_SHIFT_64K)
return pmd_offset(pud, addr);
else
return (pmd_t *) pud;
}
static inline
pmd_t *hpmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr)
{
if (HPAGE_SHIFT == HPAGE_SHIFT_64K)
return pmd_alloc(mm, pud, addr);
else
return (pmd_t *) pud;
}
#endif
/* Modelled after find_linux_pte() */
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pg;
pud_t *pu;
pmd_t *pm;
BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize);
@@ -96,14 +119,9 @@ pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
if (!pgd_none(*pg)) {
pu = pud_offset(pg, addr);
if (!pud_none(*pu)) {
#ifdef CONFIG_PPC_64K_PAGES
pmd_t *pm;
pm = pmd_offset(pu, addr);
pm = hpmd_offset(pu, addr);
if (!pmd_none(*pm))
return hugepte_offset((hugepd_t *)pm, addr);
#else
return hugepte_offset((hugepd_t *)pu, addr);
#endif
}
}
@@ -114,6 +132,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pg;
pud_t *pu;
pmd_t *pm;
hugepd_t *hpdp = NULL;
BUG_ON(get_slice_psize(mm, addr) != mmu_huge_psize);
@@ -124,14 +143,9 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
pu = pud_alloc(mm, pg, addr);
if (pu) {
#ifdef CONFIG_PPC_64K_PAGES
pmd_t *pm;
pm = pmd_alloc(mm, pu, addr);
pm = hpmd_alloc(mm, pu, addr);
if (pm)
hpdp = (hugepd_t *)pm;
#else
hpdp = (hugepd_t *)pu;
#endif
}
if (! hpdp)
@@ -158,7 +172,6 @@ static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp)
PGF_CACHENUM_MASK));
}
#ifdef CONFIG_PPC_64K_PAGES
static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
unsigned long addr, unsigned long end,
unsigned long floor, unsigned long ceiling)
@@ -191,7 +204,6 @@ static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
pud_clear(pud);
pmd_free_tlb(tlb, pmd);
}
#endif
static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
unsigned long addr, unsigned long end,
@@ -210,9 +222,15 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
continue;
hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling);
#else
if (pud_none(*pud))
continue;
free_hugepte_range(tlb, (hugepd_t *)pud);
if (HPAGE_SHIFT == HPAGE_SHIFT_64K) {
if (pud_none_or_clear_bad(pud))
continue;
hugetlb_free_pmd_range(tlb, pud, addr, next, floor, ceiling);
} else {
if (pud_none(*pud))
continue;
free_hugepte_range(tlb, (hugepd_t *)pud);
}
#endif
} while (pud++, addr = next, addr != end);
@@ -526,6 +544,57 @@ repeat:
return err;
}
void set_huge_psize(int psize)
{
/* Check that it is a page size supported by the hardware and
* that it fits within pagetable limits. */
if (mmu_psize_defs[psize].shift && mmu_psize_defs[psize].shift < SID_SHIFT &&
(mmu_psize_defs[psize].shift > MIN_HUGEPTE_SHIFT ||
mmu_psize_defs[psize].shift == HPAGE_SHIFT_64K)) {
HPAGE_SHIFT = mmu_psize_defs[psize].shift;
mmu_huge_psize = psize;
#ifdef CONFIG_PPC_64K_PAGES
hugepte_shift = (PMD_SHIFT-HPAGE_SHIFT);
#else
if (HPAGE_SHIFT == HPAGE_SHIFT_64K)
hugepte_shift = (PMD_SHIFT-HPAGE_SHIFT);
else
hugepte_shift = (PUD_SHIFT-HPAGE_SHIFT);
#endif
} else
HPAGE_SHIFT = 0;
}
static int __init hugepage_setup_sz(char *str)
{
unsigned long long size;
int mmu_psize = -1;
int shift;
size = memparse(str, &str);
shift = __ffs(size);
switch (shift) {
#ifndef CONFIG_PPC_64K_PAGES
case HPAGE_SHIFT_64K:
mmu_psize = MMU_PAGE_64K;
break;
#endif
case HPAGE_SHIFT_16M:
mmu_psize = MMU_PAGE_16M;
break;
}
if (mmu_psize >=0 && mmu_psize_defs[mmu_psize].shift)
set_huge_psize(mmu_psize);
else
printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size);
return 1;
}
__setup("hugepagesz=", hugepage_setup_sz);
static void zero_ctor(struct kmem_cache *cache, void *addr)
{
memset(addr, 0, kmem_cache_size(cache));