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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-09-21 12:09:41 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-09-21 12:09:41 -0700
commitda8f153e51290e7438ba7da66234a864e5d3e1c1 (patch)
tree90d3cc5eeb5d2e18877ccb1123a4df7873fd3c58
parent077a6c26696c63305eebafbb71890c95e2750b6d (diff)
downloadlinux-2.6.34-ux500-da8f153e51290e7438ba7da66234a864e5d3e1c1.tar.gz
Revert "x86_64: Quicklist support for x86_64"
This reverts commit 34feb2c83beb3bdf13535a36770f7e50b47ef299. Suresh Siddha points out that this one breaks the fundamental requirement that you cannot free page table pages before the TLB caches are flushed. The quicklists do not give the same kinds of guarantees that the mmu_gather structure does, at least not in NUMA configurations. Requested-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Andi Kleen <ak@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Lameter <clameter@sgi.com> Cc: Asit Mallick <asit.k.mallick@intel.com> Cc: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/x86_64/Kconfig8
-rw-r--r--arch/x86_64/kernel/process.c1
-rw-r--r--arch/x86_64/kernel/smp.c2
-rw-r--r--include/asm-x86_64/pgalloc.h73
-rw-r--r--include/asm-x86_64/pgtable.h1
5 files changed, 26 insertions, 59 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index ffa03640628..b4d9089a6a0 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -60,14 +60,6 @@ config ZONE_DMA
bool
default y
-config QUICKLIST
- bool
- default y
-
-config NR_QUICK
- int
- default 2
-
config ISA
bool
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c
index 2842f50cbe3..98956555450 100644
--- a/arch/x86_64/kernel/process.c
+++ b/arch/x86_64/kernel/process.c
@@ -208,7 +208,6 @@ void cpu_idle (void)
if (__get_cpu_var(cpu_idle_state))
__get_cpu_var(cpu_idle_state) = 0;
- check_pgt_cache();
rmb();
idle = pm_idle;
if (!idle)
diff --git a/arch/x86_64/kernel/smp.c b/arch/x86_64/kernel/smp.c
index 673a300b594..df4a82812ad 100644
--- a/arch/x86_64/kernel/smp.c
+++ b/arch/x86_64/kernel/smp.c
@@ -241,7 +241,7 @@ void flush_tlb_mm (struct mm_struct * mm)
}
if (!cpus_empty(cpu_mask))
flush_tlb_others(cpu_mask, mm, FLUSH_ALL);
- check_pgt_cache();
+
preempt_enable();
}
EXPORT_SYMBOL(flush_tlb_mm);
diff --git a/include/asm-x86_64/pgalloc.h b/include/asm-x86_64/pgalloc.h
index b467be6d367..8bb56468786 100644
--- a/include/asm-x86_64/pgalloc.h
+++ b/include/asm-x86_64/pgalloc.h
@@ -4,10 +4,6 @@
#include <asm/pda.h>
#include <linux/threads.h>
#include <linux/mm.h>
-#include <linux/quicklist.h>
-
-#define QUICK_PGD 0 /* We preserve special mappings over free */
-#define QUICK_PT 1 /* Other page table pages that are zero on free */
#define pmd_populate_kernel(mm, pmd, pte) \
set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
@@ -24,23 +20,23 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *p
static inline void pmd_free(pmd_t *pmd)
{
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
- quicklist_free(QUICK_PT, NULL, pmd);
+ free_page((unsigned long)pmd);
}
static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
{
- return (pmd_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
+ return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
}
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- return (pud_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
+ return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
}
static inline void pud_free (pud_t *pud)
{
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
- quicklist_free(QUICK_PT, NULL, pud);
+ free_page((unsigned long)pud);
}
static inline void pgd_list_add(pgd_t *pgd)
@@ -61,57 +57,41 @@ static inline void pgd_list_del(pgd_t *pgd)
spin_unlock(&pgd_lock);
}
-static inline void pgd_ctor(void *x)
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
unsigned boundary;
- pgd_t *pgd = x;
- struct page *page = virt_to_page(pgd);
-
+ pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
+ if (!pgd)
+ return NULL;
+ pgd_list_add(pgd);
/*
* Copy kernel pointers in from init.
+ * Could keep a freelist or slab cache of those because the kernel
+ * part never changes.
*/
boundary = pgd_index(__PAGE_OFFSET);
+ memset(pgd, 0, boundary * sizeof(pgd_t));
memcpy(pgd + boundary,
- init_level4_pgt + boundary,
- (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
-
- spin_lock(&pgd_lock);
- list_add(&page->lru, &pgd_list);
- spin_unlock(&pgd_lock);
-}
-
-static inline void pgd_dtor(void *x)
-{
- pgd_t *pgd = x;
- struct page *page = virt_to_page(pgd);
-
- spin_lock(&pgd_lock);
- list_del(&page->lru);
- spin_unlock(&pgd_lock);
-}
-
-static inline pgd_t *pgd_alloc(struct mm_struct *mm)
-{
- pgd_t *pgd = (pgd_t *)quicklist_alloc(QUICK_PGD,
- GFP_KERNEL|__GFP_REPEAT, pgd_ctor);
+ init_level4_pgt + boundary,
+ (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
return pgd;
}
static inline void pgd_free(pgd_t *pgd)
{
BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
- quicklist_free(QUICK_PGD, pgd_dtor, pgd);
+ pgd_list_del(pgd);
+ free_page((unsigned long)pgd);
}
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
- return (pte_t *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
+ return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
}
static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
- void *p = (void *)quicklist_alloc(QUICK_PT, GFP_KERNEL|__GFP_REPEAT, NULL);
-
+ void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
if (!p)
return NULL;
return virt_to_page(p);
@@ -123,22 +103,17 @@ static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long add
static inline void pte_free_kernel(pte_t *pte)
{
BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
- quicklist_free(QUICK_PT, NULL, pte);
+ free_page((unsigned long)pte);
}
static inline void pte_free(struct page *pte)
{
- quicklist_free_page(QUICK_PT, NULL, pte);
-}
+ __free_page(pte);
+}
-#define __pte_free_tlb(tlb,pte) quicklist_free_page(QUICK_PT, NULL,(pte))
+#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
-#define __pmd_free_tlb(tlb,x) quicklist_free(QUICK_PT, NULL, (x))
-#define __pud_free_tlb(tlb,x) quicklist_free(QUICK_PT, NULL, (x))
+#define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
+#define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
-static inline void check_pgt_cache(void)
-{
- quicklist_trim(QUICK_PGD, pgd_dtor, 25, 16);
- quicklist_trim(QUICK_PT, NULL, 25, 16);
-}
#endif /* _X86_64_PGALLOC_H */
diff --git a/include/asm-x86_64/pgtable.h b/include/asm-x86_64/pgtable.h
index c9d8764c89d..57dd6b3107e 100644
--- a/include/asm-x86_64/pgtable.h
+++ b/include/asm-x86_64/pgtable.h
@@ -411,6 +411,7 @@ pte_t *lookup_address(unsigned long addr);
#define HAVE_ARCH_UNMAPPED_AREA
#define pgtable_cache_init() do { } while (0)
+#define check_pgt_cache() do { } while (0)
#define PAGE_AGP PAGE_KERNEL_NOCACHE
#define HAVE_PAGE_AGP 1