mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 22:02:28 +00:00
dadeafdfc8
We were flushing the D-cache excessively for ptrace() processing and this makes debugging threads so slow as to be totally unusable. All process page accesses via ptrace() go via access_process_vm(). This routine, for each process page, uses get_user_pages(). That in turn does a flush_dcache_page() on the child pages before we copy in/out the ptrace request data. Therefore, all we need to do after the data movement is: 1) Flush the D-cache pages if the kernel maps the page to a different color than userspace does. 2) If we wrote to the page, we need to flush the I-cache on older cpus. Previously we just flushed the entire cache at the end of a ptrace() request, and that was beyond stupid. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
#ifndef _SPARC64_CACHEFLUSH_H
|
|
#define _SPARC64_CACHEFLUSH_H
|
|
|
|
#include <linux/config.h>
|
|
#include <asm/page.h>
|
|
|
|
/* Flushing for D-cache alias handling is only needed if
|
|
* the page size is smaller than 16K.
|
|
*/
|
|
#if PAGE_SHIFT < 14
|
|
#define DCACHE_ALIASING_POSSIBLE
|
|
#endif
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/mm.h>
|
|
|
|
/* Cache flush operations. */
|
|
|
|
/* These are the same regardless of whether this is an SMP kernel or not. */
|
|
#define flush_cache_mm(__mm) \
|
|
do { if ((__mm) == current->mm) flushw_user(); } while(0)
|
|
#define flush_cache_range(vma, start, end) \
|
|
flush_cache_mm((vma)->vm_mm)
|
|
#define flush_cache_page(vma, page, pfn) \
|
|
flush_cache_mm((vma)->vm_mm)
|
|
|
|
/*
|
|
* On spitfire, the icache doesn't snoop local stores and we don't
|
|
* use block commit stores (which invalidate icache lines) during
|
|
* module load, so we need this.
|
|
*/
|
|
extern void flush_icache_range(unsigned long start, unsigned long end);
|
|
extern void __flush_icache_page(unsigned long);
|
|
|
|
extern void __flush_dcache_page(void *addr, int flush_icache);
|
|
extern void flush_dcache_page_impl(struct page *page);
|
|
#ifdef CONFIG_SMP
|
|
extern void smp_flush_dcache_page_impl(struct page *page, int cpu);
|
|
extern void flush_dcache_page_all(struct mm_struct *mm, struct page *page);
|
|
#else
|
|
#define smp_flush_dcache_page_impl(page,cpu) flush_dcache_page_impl(page)
|
|
#define flush_dcache_page_all(mm,page) flush_dcache_page_impl(page)
|
|
#endif
|
|
|
|
extern void __flush_dcache_range(unsigned long start, unsigned long end);
|
|
extern void flush_dcache_page(struct page *page);
|
|
|
|
#define flush_icache_page(vma, pg) do { } while(0)
|
|
#define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
|
|
|
|
extern void flush_ptrace_access(struct vm_area_struct *, struct page *,
|
|
unsigned long uaddr, void *kaddr,
|
|
unsigned long len, int write);
|
|
|
|
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
|
|
do { \
|
|
flush_cache_page(vma, vaddr, page_to_pfn(page)); \
|
|
memcpy(dst, src, len); \
|
|
flush_ptrace_access(vma, page, vaddr, src, len, 0); \
|
|
} while (0)
|
|
|
|
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
|
|
do { \
|
|
flush_cache_page(vma, vaddr, page_to_pfn(page)); \
|
|
memcpy(dst, src, len); \
|
|
flush_ptrace_access(vma, page, vaddr, dst, len, 1); \
|
|
} while (0)
|
|
|
|
#define flush_dcache_mmap_lock(mapping) do { } while (0)
|
|
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
|
|
|
|
#define flush_cache_vmap(start, end) do { } while (0)
|
|
#define flush_cache_vunmap(start, end) do { } while (0)
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
|
|
#endif /* _SPARC64_CACHEFLUSH_H */
|