linux-kernel - Re: [PATCH] VM: Implements the swap-out page-clustering technique

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: <ee6a1e220809080251h4f8b1d1bnbc7af37f31cd2834@mail.gmail.com>
Date:	Mon, 8 Sep 2008 13:21:24 +0330
From:	"hamidreza jahanjou" <hamid.jahanjou@...il.com>
To:	"Li Yu" <raise.sail@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] VM: Implements the swap-out page-clustering technique

2008/9/8, Li Yu <raise.sail@...il.com>:
> And the linear searching for whole address space of a vma is not good
> idea too, really.
>
>> +	    if (!page_allowed_in_cluster(cursor_page, ci))
>> +		continue;
>>

Thank you for the review and comments. You are right in that searching
the whole process address space is not a good idea. The idea is to
make the scan range flexible, thus normally, assuming that the code
has been well-tuned, only a very limited number of VMA's are scanned.

In general, i think that the cluster size and the scan range should be
tuned depending on the backing storage characteristics and the
low-on-memory severity. Like any VM code, this one needs tuning.

BTW, the code could be implemented much more elegantly if the VMA's
were connected using a doubly-linked list. I wonder if there are
enought other codes with the same situation to justify making it
doubly-linked.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/