lists.openwall.net   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  linux-hardening  linux-cve-announce  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]
Message-ID: <0a6603c4-ac05-460c-8bad-66813570b426@gmail.com>
Date: Wed, 5 Jun 2024 11:44:24 +0800
From: Alex Shi <seakeel@...il.com>
To: David Hildenbrand <david@...hat.com>, alexs@...nel.org,
 Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, izik.eidus@...ellosystems.com,
 willy@...radead.org, aarcange@...hat.com, chrisw@...s-sol.org,
 hughd@...gle.com
Subject: Re: [PATCH 09/10] mm/ksm: calc_checksum for folio



On 6/4/24 9:18 PM, David Hildenbrand wrote:
>> @@ -2369,7 +2371,7 @@ static void cmp_and_merge_page(struct page *page, struct ksm_rmap_item *rmap_ite
>>        * don't want to insert it in the unstable tree, and we don't want
>>        * to waste our time searching for something identical to it there.
>>        */
>> -    checksum = calc_checksum(page);
>> +    checksum = calc_checksum(folio);
> 
> So for a large folio you suddenly checksum more than a single page? That's wrong.
> 
> Or am I missing something?

I am not sure if this change are good too, anyway, comparing the whole folio may have it advantages on efficiency, but more splitting do save more pages.

Anyway, this change could be dropped.

Thanks!

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ