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x86: janitor CPA statistics patch

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1) Remove __meminit from update_pages_count. It is used inside
split_pages()

2) Make the code depend on PROC_FS. Doing statistics for nothing is
useless and not adding useless code is nice to the Linux tiny folks.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2008-05-05 16:35:21 +02:00 committed by Ingo Molnar
parent ce0c0e50f9
commit 65280e613f
2 changed files with 32 additions and 24 deletions
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50
arch/x86/mm/pageattr.c
View File

@ -34,19 +34,41 @@ struct cpa_data {
unsigned force_split : 1;
};
#ifdef CONFIG_PROC_FS
static unsigned long direct_pages_count[PG_LEVEL_NUM];
void __meminit update_page_count(int level, unsigned long pages)
void update_page_count(int level, unsigned long pages)
{
#ifdef CONFIG_PROC_FS
unsigned long flags;
/* Protect against CPA */
spin_lock_irqsave(&pgd_lock, flags);
direct_pages_count[level] += pages;
spin_unlock_irqrestore(&pgd_lock, flags);
#endif
}
static void split_page_count(int level)
{
direct_pages_count[level]--;
direct_pages_count[level - 1] += PTRS_PER_PTE;
}
int arch_report_meminfo(char *page)
{
int n = sprintf(page, "DirectMap4k: %8lu\n"
"DirectMap2M: %8lu\n",
direct_pages_count[PG_LEVEL_4K],
direct_pages_count[PG_LEVEL_2M]);
#ifdef CONFIG_X86_64
n += sprintf(page + n, "DirectMap1G: %8lu\n",
direct_pages_count[PG_LEVEL_1G]);
#endif
return n;
}
#else
static inline void split_page_count(int level) { }
#endif
#ifdef CONFIG_X86_64
static inline unsigned long highmap_start_pfn(void)
@ -514,10 +536,8 @@ static int split_large_page(pte_t *kpte, unsigned long address)
set_pte(&pbase[i], pfn_pte(pfn, ref_prot));
if (address >= (unsigned long)__va(0) &&
address < (unsigned long)__va(max_pfn_mapped << PAGE_SHIFT)) {
direct_pages_count[level]--;
direct_pages_count[level - 1] += PTRS_PER_PTE;
}
address < (unsigned long)__va(max_pfn_mapped << PAGE_SHIFT))
split_page_count(level);
/*
* Install the new, split up pagetable. Important details here:
@ -1048,22 +1068,6 @@ bool kernel_page_present(struct page *page)
#endif /* CONFIG_DEBUG_PAGEALLOC */
#ifdef CONFIG_PROC_FS
int arch_report_meminfo(char *page)
{
int n;
n = sprintf(page, "DirectMap4k: %8lu\n"
"DirectMap2M: %8lu\n",
direct_pages_count[PG_LEVEL_4K],
direct_pages_count[PG_LEVEL_2M]);
#ifdef CONFIG_X86_64
n += sprintf(page + n, "DirectMap1G: %8lu\n",
direct_pages_count[PG_LEVEL_1G]);
#endif
return n;
}
#endif
/*
* The testcases use internal knowledge of the implementation that shouldn't
* be exposed to the rest of the kernel. Include these directly here.

6
include/asm-x86/pgtable.h
View File

@ -372,7 +372,11 @@ enum {
PG_LEVEL_NUM
};
void update_page_count(int level, unsigned long pages);
#ifdef CONFIG_PROC_FS
extern void update_page_count(int level, unsigned long pages);
#else
static inline void update_page_count(int level, unsigned long pages) { }
#endif
/*
* Helper function that returns the kernel pagetable entry controlling