Re: [patch 2.6.13-rc4] fix get_user_pages bug

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Tue, 2 Aug 2005, Hugh Dickins wrote:
> 
> It might not be so bad.  It's going to access the struct page anyway.
> And clearing dirty from parent and child at fork time could save two
> set_page_dirtys at exit time.  But I'm not sure that we could batch the
> the dirty bit clearing into one TLB flush like we do the write protection.

Yes, good point. If the thing is still marked dirty in the TLB, some other 
thread might be writing to the page after we've cleared dirty but before 
we've flushed the TLB - causing the new dirty bit to be lost. I think.

		Linus

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]
  Powered by Linux