On Fri, 18 Jan 2008, Miklos Szeredi wrote:
>
> That would need a new page flag (PG_mmap_dirty?). Do we have one
> available?
Yeah, that would be bad. We probably have flags free, but those page flags
are always a pain. Scratch that.
How about just setting a per-vma dirty flag, and then instead of updating
the mtime when taking the dirty-page fault, we just set that flag?
Then, on unmap and msync, we just do
if (vma->dirty-flag) {
vma->dirty_flag = 0;
update_file_times(vma->vm_file);
}
and be done with it?
Linus
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