lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Tue, 17 Mar 2015 15:12:05 +0530
From:	"Aneesh Kumar K.V" <>
To:	"Kirill A. Shutemov" <>,
	Andrew Morton <>,
	Andrea Arcangeli <>
Cc:	Dave Hansen <>,
	Hugh Dickins <>, Mel Gorman <>,
	Rik van Riel <>,
	Vlastimil Babka <>,
	Christoph Lameter <>,
	Naoya Horiguchi <>,
	Steve Capper <>,
	Johannes Weiner <>,
	Michal Hocko <>,
	Jerome Marchand <>,,,
	"Kirill A. Shutemov" <>
Subject: Re: [PATCHv4 00/24] THP refcounting redesign

"Kirill A. Shutemov" <> writes:

> Hello everybody,
> It's bug-fix update of my thp refcounting work.
> The goal of patchset is to make refcounting on THP pages cheaper with
> simpler semantics and allow the same THP compound page to be mapped with
> PMD and PTEs. This is required to get reasonable THP-pagecache
> implementation.
> With the new refcounting design it's much easier to protect against
> split_huge_page(): simple reference on a page will make you the deal.
> It makes gup_fast() implementation simpler and doesn't require
> special-case in futex code to handle tail THP pages.
> It should improve THP utilization over the system since splitting THP in
> one process doesn't necessary lead to splitting the page in all other
> processes have the page mapped.

I tested this patch on ppc64 and verified thp allocation and split.
I also checked the subpage_prot and it worked as expected. I will
run more tests with this series and update if I find any issues.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists