585fa72493
On the 34K the redundant cache operations were causing excessive stalls
resulting in realtime code running on the second VPE missing its deadline.
For all other platforms this patch is just a significant performance
improvment as illustrated by below benchmark numbers.
Processor, Processes - times in microseconds - smaller is better
------------------------------------------------------------------------------
Host OS Mhz null null open slct sig sig fork exec sh
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
25Kf 2.6.18-rc4 533 0.49 1.16 7.57 33.4 30.5 1.34 12.4 5497 17.K 54.K
25Kf 2.6.18-rc4-p 533 0.49 1.16 6.68 23.0 30.7 1.36 8.55 5030 16.K 48.K
4Kc 2.6.18-rc4 80 4.21 15.0 131. 289. 261. 16.5 258. 18.K 70.K 227K
4Kc 2.6.18-rc4-p 80 4.34 13.1 128. 285. 262. 18.2 258. 12.K 52.K 176K
34Kc 2.6.18-rc4 40 5.01 14.0 61.6 90.0 477. 17.9 94.7 29.K 108K 342K
34Kc 2.6.18-rc4-p 40 4.98 13.9 61.2 89.7 475. 17.6 93.7 8758 44.K 158K
BCM1480 2.6.18-rc4 700 0.28 0.60 3.68 5.92 16.0 0.78 5.08 931. 3163 15.K
BCM1480 2.6.18-rc4-p 700 0.28 0.61 3.65 5.85 16.0 0.79 5.20 395. 1464 8385
TX49-16K 2.6.18-rc3 197 0.73 2.41 19.0 37.8 82.9 2.94 17.5 4438 14.K 56.K
TX49-16K 2.6.18-rc3-p 197 0.73 2.40 19.9 36.3 82.9 2.94 23.4 2577 9103 38.K
TX49-32K 2.6.18-rc3 396 0.36 1.19 6.80 11.8 41.0 1.46 8.17 2738 8465 32.K
TX49-32K 2.6.18-rc3-p 396 0.36 1.19 6.82 10.2 41.0 1.46 8.18 1330 4638 18.K
Original patch by me with enhancements by Atsushi Nemoto.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
101 lines
3.4 KiB
C
101 lines
3.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 by Ralf Baechle
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* Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
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*/
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#ifndef _ASM_CACHEFLUSH_H
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#define _ASM_CACHEFLUSH_H
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/* Keep includes the same across arches. */
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#include <linux/mm.h>
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#include <asm/cpu-features.h>
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/* Cache flushing:
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*
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* - flush_cache_all() flushes entire cache
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* - flush_cache_mm(mm) flushes the specified mm context's cache lines
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* - flush_cache_page(mm, vmaddr, pfn) flushes a single page
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* - flush_cache_range(vma, start, end) flushes a range of pages
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* - flush_icache_range(start, end) flush a range of instructions
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* - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
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*
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* MIPS specific flush operations:
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*
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* - flush_cache_sigtramp() flush signal trampoline
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* - flush_icache_all() flush the entire instruction cache
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* - flush_data_cache_page() flushes a page from the data cache
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*/
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extern void (*flush_cache_all)(void);
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extern void (*__flush_cache_all)(void);
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extern void (*flush_cache_mm)(struct mm_struct *mm);
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extern void (*flush_cache_range)(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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extern void (*flush_cache_page)(struct vm_area_struct *vma, unsigned long page, unsigned long pfn);
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extern void __flush_dcache_page(struct page *page);
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static inline void flush_dcache_page(struct page *page)
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{
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if (cpu_has_dc_aliases || !cpu_has_ic_fills_f_dc)
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__flush_dcache_page(page);
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}
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#define flush_dcache_mmap_lock(mapping) do { } while (0)
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#define flush_dcache_mmap_unlock(mapping) do { } while (0)
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extern void (*__flush_icache_page)(struct vm_area_struct *vma,
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struct page *page);
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static inline void flush_icache_page(struct vm_area_struct *vma,
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struct page *page)
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{
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}
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extern void (*flush_icache_range)(unsigned long start, unsigned long end);
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#define flush_cache_vmap(start, end) flush_cache_all()
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#define flush_cache_vunmap(start, end) flush_cache_all()
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static inline void copy_to_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (cpu_has_dc_aliases)
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flush_cache_page(vma, vaddr, page_to_pfn(page));
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memcpy(dst, src, len);
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__flush_icache_page(vma, page);
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}
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static inline void copy_from_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (cpu_has_dc_aliases)
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flush_cache_page(vma, vaddr, page_to_pfn(page));
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memcpy(dst, src, len);
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}
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extern void (*flush_cache_sigtramp)(unsigned long addr);
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extern void (*flush_icache_all)(void);
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extern void (*local_flush_data_cache_page)(void * addr);
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extern void (*flush_data_cache_page)(unsigned long addr);
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/*
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* This flag is used to indicate that the page pointed to by a pte
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* is dirty and requires cleaning before returning it to the user.
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*/
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#define PG_dcache_dirty PG_arch_1
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#define Page_dcache_dirty(page) \
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test_bit(PG_dcache_dirty, &(page)->flags)
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#define SetPageDcacheDirty(page) \
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set_bit(PG_dcache_dirty, &(page)->flags)
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#define ClearPageDcacheDirty(page) \
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clear_bit(PG_dcache_dirty, &(page)->flags)
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/* Run kernel code uncached, useful for cache probing functions. */
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unsigned long __init run_uncached(void *func);
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#endif /* _ASM_CACHEFLUSH_H */
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