From: Peter Zijlstra Date: Wed, 25 May 2011 00:12:14 +0000 (-0700) Subject: mm: uninline large generic tlb.h functions X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=9547d01bfb9c351dc19067f8a4cea9d3955f4125;p=openwrt%2Fstaging%2Fblogic.git mm: uninline large generic tlb.h functions Some of these functions have grown beyond inline sanity, move them out-of-line. Signed-off-by: Peter Zijlstra Requested-by: Andrew Morton Requested-by: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h index 5a946a08ff9d..e58fa777fa09 100644 --- a/include/asm-generic/tlb.h +++ b/include/asm-generic/tlb.h @@ -96,134 +96,25 @@ struct mmu_gather { struct page *__pages[MMU_GATHER_BUNDLE]; }; -/* - * For UP we don't need to worry about TLB flush - * and page free order so much.. - */ -#ifdef CONFIG_SMP - #define tlb_fast_mode(tlb) (tlb->fast_mode) -#else - #define tlb_fast_mode(tlb) 1 -#endif +#define HAVE_GENERIC_MMU_GATHER -static inline int tlb_next_batch(struct mmu_gather *tlb) +static inline int tlb_fast_mode(struct mmu_gather *tlb) { - struct mmu_gather_batch *batch; - - batch = tlb->active; - if (batch->next) { - tlb->active = batch->next; - return 1; - } - - batch = (void *)__get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0); - if (!batch) - return 0; - - batch->next = NULL; - batch->nr = 0; - batch->max = MAX_GATHER_BATCH; - - tlb->active->next = batch; - tlb->active = batch; - +#ifdef CONFIG_SMP + return tlb->fast_mode; +#else + /* + * For UP we don't need to worry about TLB flush + * and page free order so much.. + */ return 1; -} - -/* tlb_gather_mmu - * Called to initialize an (on-stack) mmu_gather structure for page-table - * tear-down from @mm. The @fullmm argument is used when @mm is without - * users and we're going to destroy the full address space (exit/execve). - */ -static inline void -tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm) -{ - tlb->mm = mm; - - tlb->fullmm = fullmm; - tlb->need_flush = 0; - tlb->fast_mode = (num_possible_cpus() == 1); - tlb->local.next = NULL; - tlb->local.nr = 0; - tlb->local.max = ARRAY_SIZE(tlb->__pages); - tlb->active = &tlb->local; - -#ifdef CONFIG_HAVE_RCU_TABLE_FREE - tlb->batch = NULL; #endif } -static inline void -tlb_flush_mmu(struct mmu_gather *tlb) -{ - struct mmu_gather_batch *batch; - - if (!tlb->need_flush) - return; - tlb->need_flush = 0; - tlb_flush(tlb); -#ifdef CONFIG_HAVE_RCU_TABLE_FREE - tlb_table_flush(tlb); -#endif - - if (tlb_fast_mode(tlb)) - return; - - for (batch = &tlb->local; batch; batch = batch->next) { - free_pages_and_swap_cache(batch->pages, batch->nr); - batch->nr = 0; - } - tlb->active = &tlb->local; -} - -/* tlb_finish_mmu - * Called at the end of the shootdown operation to free up any resources - * that were required. - */ -static inline void -tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) -{ - struct mmu_gather_batch *batch, *next; - - tlb_flush_mmu(tlb); - - /* keep the page table cache within bounds */ - check_pgt_cache(); - - for (batch = tlb->local.next; batch; batch = next) { - next = batch->next; - free_pages((unsigned long)batch, 0); - } - tlb->local.next = NULL; -} - -/* __tlb_remove_page - * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), while - * handling the additional races in SMP caused by other CPUs caching valid - * mappings in their TLBs. Returns the number of free page slots left. - * When out of page slots we must call tlb_flush_mmu(). - */ -static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) -{ - struct mmu_gather_batch *batch; - - tlb->need_flush = 1; - - if (tlb_fast_mode(tlb)) { - free_page_and_swap_cache(page); - return 1; /* avoid calling tlb_flush_mmu() */ - } - - batch = tlb->active; - batch->pages[batch->nr++] = page; - VM_BUG_ON(batch->nr > batch->max); - if (batch->nr == batch->max) { - if (!tlb_next_batch(tlb)) - return 0; - } - - return batch->max - batch->nr; -} +void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm); +void tlb_flush_mmu(struct mmu_gather *tlb); +void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end); +int __tlb_remove_page(struct mmu_gather *tlb, struct page *page); /* tlb_remove_page * Similar to __tlb_remove_page but will call tlb_flush_mmu() itself when diff --git a/mm/memory.c b/mm/memory.c index 7bbe4d3df756..b73f677f0bb1 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -182,7 +182,7 @@ void sync_mm_rss(struct task_struct *task, struct mm_struct *mm) { __sync_task_rss_stat(task, mm); } -#else +#else /* SPLIT_RSS_COUNTING */ #define inc_mm_counter_fast(mm, member) inc_mm_counter(mm, member) #define dec_mm_counter_fast(mm, member) dec_mm_counter(mm, member) @@ -191,8 +191,128 @@ static void check_sync_rss_stat(struct task_struct *task) { } +#endif /* SPLIT_RSS_COUNTING */ + +#ifdef HAVE_GENERIC_MMU_GATHER + +static int tlb_next_batch(struct mmu_gather *tlb) +{ + struct mmu_gather_batch *batch; + + batch = tlb->active; + if (batch->next) { + tlb->active = batch->next; + return 1; + } + + batch = (void *)__get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0); + if (!batch) + return 0; + + batch->next = NULL; + batch->nr = 0; + batch->max = MAX_GATHER_BATCH; + + tlb->active->next = batch; + tlb->active = batch; + + return 1; +} + +/* tlb_gather_mmu + * Called to initialize an (on-stack) mmu_gather structure for page-table + * tear-down from @mm. The @fullmm argument is used when @mm is without + * users and we're going to destroy the full address space (exit/execve). + */ +void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, bool fullmm) +{ + tlb->mm = mm; + + tlb->fullmm = fullmm; + tlb->need_flush = 0; + tlb->fast_mode = (num_possible_cpus() == 1); + tlb->local.next = NULL; + tlb->local.nr = 0; + tlb->local.max = ARRAY_SIZE(tlb->__pages); + tlb->active = &tlb->local; + +#ifdef CONFIG_HAVE_RCU_TABLE_FREE + tlb->batch = NULL; +#endif +} + +void tlb_flush_mmu(struct mmu_gather *tlb) +{ + struct mmu_gather_batch *batch; + + if (!tlb->need_flush) + return; + tlb->need_flush = 0; + tlb_flush(tlb); +#ifdef CONFIG_HAVE_RCU_TABLE_FREE + tlb_table_flush(tlb); #endif + if (tlb_fast_mode(tlb)) + return; + + for (batch = &tlb->local; batch; batch = batch->next) { + free_pages_and_swap_cache(batch->pages, batch->nr); + batch->nr = 0; + } + tlb->active = &tlb->local; +} + +/* tlb_finish_mmu + * Called at the end of the shootdown operation to free up any resources + * that were required. + */ +void tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end) +{ + struct mmu_gather_batch *batch, *next; + + tlb_flush_mmu(tlb); + + /* keep the page table cache within bounds */ + check_pgt_cache(); + + for (batch = tlb->local.next; batch; batch = next) { + next = batch->next; + free_pages((unsigned long)batch, 0); + } + tlb->local.next = NULL; +} + +/* __tlb_remove_page + * Must perform the equivalent to __free_pte(pte_get_and_clear(ptep)), while + * handling the additional races in SMP caused by other CPUs caching valid + * mappings in their TLBs. Returns the number of free page slots left. + * When out of page slots we must call tlb_flush_mmu(). + */ +int __tlb_remove_page(struct mmu_gather *tlb, struct page *page) +{ + struct mmu_gather_batch *batch; + + tlb->need_flush = 1; + + if (tlb_fast_mode(tlb)) { + free_page_and_swap_cache(page); + return 1; /* avoid calling tlb_flush_mmu() */ + } + + batch = tlb->active; + batch->pages[batch->nr++] = page; + if (batch->nr == batch->max) { + if (!tlb_next_batch(tlb)) + return 0; + } + VM_BUG_ON(batch->nr > batch->max); + + return batch->max - batch->nr; +} + +#endif /* HAVE_GENERIC_MMU_GATHER */ + #ifdef CONFIG_HAVE_RCU_TABLE_FREE /* @@ -268,7 +388,7 @@ void tlb_remove_table(struct mmu_gather *tlb, void *table) tlb_table_flush(tlb); } -#endif +#endif /* CONFIG_HAVE_RCU_TABLE_FREE */ /* * If a p?d_bad entry is found while walking page tables, report