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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-05-25 00:11:55 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 15:39:15 (GMT) |
commit | 7a95a2c80748bb91e0bf4b8d58396542e1319d21 (patch) | |
tree | 0b942b8d5fef0667e14f6b74fce840c09938edea /arch/ia64 | |
parent | 1e56a56410bb64bce62d44563e35a143fc2d515f (diff) | |
download | linux-fsl-qoriq-7a95a2c80748bb91e0bf4b8d58396542e1319d21.tar.xz |
ia64: mmu_gather rework
Fix up the ia64 mmu_gather code to conform to the new API.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Tony Luck <tony.luck@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Miller <davem@davemloft.net>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/ia64')
-rw-r--r-- | arch/ia64/include/asm/tlb.h | 66 |
1 files changed, 46 insertions, 20 deletions
diff --git a/arch/ia64/include/asm/tlb.h b/arch/ia64/include/asm/tlb.h index 23cce99..c3ffe3e 100644 --- a/arch/ia64/include/asm/tlb.h +++ b/arch/ia64/include/asm/tlb.h @@ -47,21 +47,27 @@ #include <asm/machvec.h> #ifdef CONFIG_SMP -# define FREE_PTE_NR 2048 # define tlb_fast_mode(tlb) ((tlb)->nr == ~0U) #else -# define FREE_PTE_NR 0 # define tlb_fast_mode(tlb) (1) #endif +/* + * If we can't allocate a page to make a big batch of page pointers + * to work on, then just handle a few from the on-stack structure. + */ +#define IA64_GATHER_BUNDLE 8 + struct mmu_gather { struct mm_struct *mm; unsigned int nr; /* == ~0U => fast mode */ + unsigned int max; unsigned char fullmm; /* non-zero means full mm flush */ unsigned char need_flush; /* really unmapped some PTEs? */ unsigned long start_addr; unsigned long end_addr; - struct page *pages[FREE_PTE_NR]; + struct page **pages; + struct page *local[IA64_GATHER_BUNDLE]; }; struct ia64_tr_entry { @@ -90,9 +96,6 @@ extern struct ia64_tr_entry *ia64_idtrs[NR_CPUS]; #define RR_RID_MASK 0x00000000ffffff00L #define RR_TO_RID(val) ((val >> 8) & 0xffffff) -/* Users of the generic TLB shootdown code must declare this storage space. */ -DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); - /* * Flush the TLB for address range START to END and, if not in fast mode, release the * freed pages that where gathered up to this point. @@ -147,15 +150,23 @@ ia64_tlb_flush_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long e } } -/* - * Return a pointer to an initialized struct mmu_gather. - */ -static inline struct mmu_gather * -tlb_gather_mmu (struct mm_struct *mm, unsigned int full_mm_flush) +static inline void __tlb_alloc_page(struct mmu_gather *tlb) { - struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); + unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0); + if (addr) { + tlb->pages = (void *)addr; + tlb->max = PAGE_SIZE / sizeof(void *); + } +} + + +static inline void +tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned int full_mm_flush) +{ tlb->mm = mm; + tlb->max = ARRAY_SIZE(tlb->local); + tlb->pages = tlb->local; /* * Use fast mode if only 1 CPU is online. * @@ -172,7 +183,6 @@ tlb_gather_mmu (struct mm_struct *mm, unsigned int full_mm_flush) tlb->nr = (num_online_cpus() == 1) ? ~0U : 0; tlb->fullmm = full_mm_flush; tlb->start_addr = ~0UL; - return tlb; } /* @@ -180,7 +190,7 @@ tlb_gather_mmu (struct mm_struct *mm, unsigned int full_mm_flush) * collected. */ static inline void -tlb_finish_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end) +tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) { /* * Note: tlb->nr may be 0 at this point, so we can't rely on tlb->start_addr and @@ -191,7 +201,8 @@ tlb_finish_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end) /* keep the page table cache within bounds */ check_pgt_cache(); - put_cpu_var(mmu_gathers); + if (tlb->pages != tlb->local) + free_pages((unsigned long)tlb->pages, 0); } /* @@ -199,18 +210,33 @@ tlb_finish_mmu (struct mmu_gather *tlb, unsigned long start, unsigned long end) * must be delayed until after the TLB has been flushed (see comments at the beginning of * this file). */ -static inline void -tlb_remove_page (struct mmu_gather *tlb, struct page *page) +static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) { tlb->need_flush = 1; if (tlb_fast_mode(tlb)) { free_page_and_swap_cache(page); - return; + return 1; /* avoid calling tlb_flush_mmu */ } + + if (!tlb->nr && tlb->pages == tlb->local) + __tlb_alloc_page(tlb); + tlb->pages[tlb->nr++] = page; - if (tlb->nr >= FREE_PTE_NR) - ia64_tlb_flush_mmu(tlb, tlb->start_addr, tlb->end_addr); + VM_BUG_ON(tlb->nr > tlb->max); + + return tlb->max - tlb->nr; +} + +static inline void tlb_flush_mmu(struct mmu_gather *tlb) +{ + ia64_tlb_flush_mmu(tlb, tlb->start_addr, tlb->end_addr); +} + +static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page) +{ + if (!__tlb_remove_page(tlb, page)) + tlb_flush_mmu(tlb); } /* |