linux-kernel - cfq-iosched:questions about cfqqs' fairness

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <SNT404-EAS355121DD7804BB96F959012C63D0@phx.gbl>
Date:	Fri, 16 Oct 2015 19:17:55 +0800
From:	shifei ge <shifeige@...look.com>
To:	linux-kernel@...r.kernel.org
Subject: cfq-iosched:questions about cfqqs' fairness

hello everyone,

i have some questions about cfq,could you give me some help?thanks!

codes:
cfq_service_tree_add:rb_key = cfq_slice_offset(cfqd, cfqq) + jiffies;

my questions as blew:

1,why use max_slice - cfqq_slice to dertermine offset in service tree, how the offset guarantee cfqqs' fairness whithin the servicetree?

2,why we add jiffies?

thanks again.