RE: [PATCH 2/3 htlb-fault] Demand faulting for hugetlb

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

 



On Wed, 2005-09-07 at 10:33 +0800, Zhang, Yanmin wrote:
> >>-----Original Message-----
> >>From: [email protected]
> >>[mailto:[email protected]] On Behalf Of Adam Litke
> >>Sent: Wednesday, September 07, 2005 5:59 AM
> >>To: [email protected]
> >>Cc: ADAM G. LITKE [imap]
> >>Subject: Re: [PATCH 2/3 htlb-fault] Demand faulting for hugetlb
> 
> >>+retry:
> >>+	page = find_get_page(mapping, idx);
> >>+	if (!page) {
> >>+		/* charge the fs quota first */
> >>+		if (hugetlb_get_quota(mapping)) {
> >>+			ret = VM_FAULT_SIGBUS;
> >>+			goto out;
> >>+		}
> >>+		page = alloc_huge_page();
> >>+		if (!page) {
> >>+			hugetlb_put_quota(mapping);
> >>+			ret = VM_FAULT_SIGBUS;
> >>+			goto out;
> >>+		}
> >>+		if (add_to_page_cache(page, mapping, idx, GFP_ATOMIC)) {
> 
> Here you lost hugetlb_put_quota(mapping);

Whoops, thanks for catching that.

> >>+			put_page(page);
> >>+			goto retry;
> >>+		}
> >>+		unlock_page(page);
> 
> As for regular pages, kernel is used to unlock mm-> page_table_lock
> before find_get_page and relock it before setting pte. Why isn't the
> style followed by huge page fault?

As far as I can tell, we should be able to do that for large pages as
well.  I'll give it a spin.

-- 
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center

-
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