Re: 1352 NUL bytes at the end of a page?

[viro]

On Mon, May 17, 2004 at 11:39:58AM -0600, Steven Cole wrote:
> Yes, seven of the 52 references to mmap in the strace output met
> the above criteria: 
> 
>   old_mmap(0x4015f000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x142000) = 0x4015f000
>   old_mmap(0x40170000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x9000) = 0x40170000
>   old_mmap(0x40180000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0x9000) = 0x40180000
>   old_mmap(0x40191000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0x10000) = 0x40191000
>   old_mmap(0x4019c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0x7000) = 0x4019c000
>   old_mmap(0x401a0000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0x3000) = 0x401a0000
>   old_mmap(0x401af000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 4, 0xe000) = 0x401af000

Shared libraries.  And no, those will never lead to any writes, no matter how
you modify them (MAP_PRIVATE).  Which is the point, since that's where we
are doing relocations and we definitely do not want that to hit the disk ;-)

IOW, we can remove writes of dirtied mmap'ed pages from consideration.
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