From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <200603091202.k29C24g19696@unix-os.sc.intel.com> From: "Chen, Kenneth W" Subject: RE: [patch] hugetlb strict commit accounting Date: Thu, 9 Mar 2006 04:02:06 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit In-Reply-To: <20060309112635.GB9479@localhost.localdomain> Sender: owner-linux-mm@kvack.org Return-Path: To: 'David Gibson' Cc: wli@holomorphy.com, 'Andrew Morton' , linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: David Gibson wrote on Thursday, March 09, 2006 3:27 AM > Again, there are no changes to the fault handler. Including the > promised changes which would mean my instantiation serialization path > isn't necessary ;-). This is the major portion that I omitted in the first patch and is the real kicker that fulfills the promise of guaranteed available hugetlb page for shared mapping. You can shower me all over on the lock protection :-) yes, this is not perfect and was the reason I did not post it earlier, but I want to give you the concept on how I envision this route would work. Again PRIVATE mapping is busted, you can't count them from inode. You would have to count them via mm_struct (I think). - Ken Note: definition of "reservation" in earlier patch is total hugetlb pages needed for that file, including the one that is already faulted in. Maybe that throw you off a bit because I'm guessing your definition is "needed in the future" and probably you are looking for a decrement of the counter in the fault path? --- ./mm/hugetlb.c.orig 2006-03-09 04:46:38.965547435 -0800 +++ ./mm/hugetlb.c 2006-03-09 04:48:20.804413375 -0800 @@ -196,6 +196,8 @@ static unsigned long set_max_huge_pages( enqueue_huge_page(page); spin_unlock(&hugetlb_lock); } + if (count < atomic_read(&resv_huge_pages)) + count = atomic_read(&resv_huge_pages); if (count >= nr_huge_pages) return nr_huge_pages; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org