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authorhttps://me.yahoo.com/a/g3Ccalpj0NhN566pHbUl6i9QF0QEkrhlfPM-#b1c14 <diana@web>2015-02-16 20:08:03 +0100
committerGNU Hurd web pages engine <web-hurd@gnu.org>2015-02-16 20:08:03 +0100
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-[[!meta copyright="Copyright © 2011 Free Software Foundation, Inc."]]
-
-[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
-id="license" text="Permission is granted to copy, distribute and/or modify this
-document under the terms of the GNU Free Documentation License, Version 1.2 or
-any later version published by the Free Software Foundation; with no Invariant
-Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
-is included in the section entitled [[GNU Free Documentation
-License|/fdl]]."]]"""]]
-
-IRC, freenode, #hurd, 2011-07-22
-
- <braunr> an interesting question i've had in mind for a few weeks now is
- I/O accounting
- <braunr> what *is* I/O on a microkernel based system ?
- <braunr> can any cross address space transfer be classified as I/O ?
-
-IRC, freenode, #hurd, 2011-07-29
-
- < braunr> how does the hurd account I/O ?
- < youpi> I don't think it does
- < youpi> not an easy task, actually
- < youpi> since gnumach has no idea about it
- < braunr> yes
- < braunr> another centralization issue
- < braunr> does network access count as I/O on linux ?
- < youpi> no
- < braunr> not even nfs ?
- < youpi> else you'd get 100% for servers :)
- < braunr> right
- < youpi> nfs goes through vfs first
- < braunr> i'll rephrase my question
- < youpi> I'd need to check but I believe it can check nfs
- < braunr> does I/O accounting occur at the vfs level or block layer ?
- < youpi> I don't know, but I beleive vfs
- < youpi> (at least that's how I'd do it)
- < braunr> i don't have any more nfs box to test that :/
- < braunr> personally i'd do it at the block layer :)
- < youpi> well, both
- < youpi> so e2fsck can show up too
- < braunr> yes
- < youpi> it's just a matter of ref counting
- < youpi> apparently nfs doesn't account
- < youpi> find . -printf "" doesn't show up in waitio
- < braunr> good
- < youpi> well, depends on the point of view
- < youpi> as a user, you'd like to know whether your processes are stuck on
- i/o (be it disk or net)
- < braunr> this implies clearly defining what io is