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powerpc/mm: Rework & cleanup page table freeing code path

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That patch used to just add a hook to page table flushing but
pulling that string brought out a whole bunch of issues, so it
now does that and more:

 - We now make the RCU batching of page freeing SMP only, as I
believe it was intended initially. We make a few more things compile
to nothing on !CONFIG_SMP

 - Some macros are turned into functions, though that forced me to
out of line a few stuffs due to unsolvable include depenencies,
however it's probably better that way anyway, it's not -that-
critical code path.

 - 32-bit didn't call pte_free_finish() on tlb_flush() which means
that it wouldn't push out the batch to RCU for delayed freeing when
a bunch of page tables have been freed, they would just stay in there
until the batch gets full.

64-bit BookE will use that hook to maintain the virtually linear
page tables or the indirect entries in the TLB when using the
HW loader.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2009-07-23 23:15:28 +00:00
parent cf54dc7cd4
commit c7cc58a1ad
6 changed files with 67 additions and 46 deletions
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39
arch/powerpc/include/asm/pgalloc.h
View file

@ -4,6 +4,15 @@
#include <linux/mm.h>
#ifdef CONFIG_PPC_BOOK3E
extern void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address);
#else /* CONFIG_PPC_BOOK3E */
static inline void tlb_flush_pgtable(struct mmu_gather *tlb,
unsigned long address)
{
}
#endif /* !CONFIG_PPC_BOOK3E */
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
free_page((unsigned long)pte);
@ -35,19 +44,27 @@ static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
#include <asm/pgalloc-32.h>
#endif
extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
#ifdef CONFIG_SMP
#define __pte_free_tlb(tlb,ptepage,address) \
do { \
pgtable_page_dtor(ptepage); \
pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1)); \
} while (0)
#else
#define __pte_free_tlb(tlb, pte, address) pte_free((tlb)->mm, (pte))
#endif
extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
extern void pte_free_finish(void);
#else /* CONFIG_SMP */
static inline void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf)
{
pgtable_free(pgf);
}
static inline void pte_free_finish(void) { }
#endif /* !CONFIG_SMP */
static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *ptepage,
unsigned long address)
{
pgtable_free_t pgf = pgtable_free_cache(page_address(ptepage),
PTE_NONCACHE_NUM,
PTE_TABLE_SIZE-1);
tlb_flush_pgtable(tlb, address);
pgtable_page_dtor(ptepage);
pgtable_free_tlb(tlb, pgf);
}
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_PGALLOC_H */