What are you using in dtrace to count page faults?
max
love_code meta wrote:
> Hi All
>
> Now I 'm testing mmap function, and my pagesize is 4k bytes. After
> mapping 8k virtual memory, by dtrace I find there is only one
> pagefault when I access memory like that s[0] , s[4096].
>
> The following is my test spteps.
> 1. fd = open("/var/tmp/mmap.file", O_RDWR);
> 2. I'm sure fd is validate. then
> s = (char *)mmap(NULL, 8192,
> PROT_READ | PROT_WRITE,
> MAP_PRIVATE,
> fd, 0L);
> 3. for (i =0; i < 8192; i +=4096)
> a=s[i];
>
> Based on my knowledge, the step 3 should has two pagefault traps.
> because our pagesize is 4k, correct?
>
>
> Thanks,
> Ma Ling
>
>
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