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Date: Wed, 12 Dec 2007 11:18:59 +0530
From: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To: Greg KH <gregkh@...e.de>
Cc: lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
Balbir Singh <balbir@...ibm.com>
Subject: Re: [PATCH] Add Documentation for FAIR_USER_SCHED sysfs files
On Tue, Dec 11, 2007 at 09:35:56PM -0800, Greg KH wrote:
> On Wed, Dec 12, 2007 at 08:08:36AM +0530, Dhaval Giani wrote:
> >
> > This patch adds documentation about /sys/kernel/uids/<uid>/cpu_share
> > to Documentation/ABI.
> >
> > Signed-off-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> >
> > ---
> > Documentation/ABI/testing/sysfs-kernel-uids | 10 ++++++++++
> > 1 files changed, 10 insertions(+)
> >
> > Index: current/Documentation/ABI/testing/sysfs-kernel-uids
> > ===================================================================
> > --- /dev/null
> > +++ current/Documentation/ABI/testing/sysfs-kernel-uids
> > @@ -0,0 +1,10 @@
> > +What: /sys/kernel/uids/<uid>/cpu_shares
> > +Date: December 2007
> > +Contact: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> > + Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
> > +Description:
> > + The /sys/kernel/uids/<uid>/cpu_shares tunable is used
> > + to set the cpu bandwidth a user is allowed. This is a
> > + propotional value. What that means is that if there
> > + are two users logged in, each with shares 1024, they
> > + will get equal CPU bandwidth.
>
> Hm, how about describing the units here? Can you put "10" in each file
> and everyone will get the same share? 100? 1? 1024 seems like an odd
> "share" number. Unless there is some other document you wish to refer
> people to do help describe these values?
>
It is proportional. That is, if two users have same value for shares,
they will get equal bandwidth on the CPU. If they are in the ratio 1:2,
then they will share it in that ratio. I've updated the patch for this.
Hope it is clearer.
Thanks,
--
This patch adds documentation about /sys/kernel/uids/<uid>/cpu_share
to Documentation/ABI.
Signed-off-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
---
Documentation/ABI/testing/sysfs-kernel-uids | 14 ++++++++++++++
1 files changed, 14 insertions(+)
Index: current/Documentation/ABI/testing/sysfs-kernel-uids
===================================================================
--- /dev/null
+++ current/Documentation/ABI/testing/sysfs-kernel-uids
@@ -0,0 +1,14 @@
+What: /sys/kernel/uids/<uid>/cpu_shares
+Date: December 2007
+Contact: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
+ Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
+Description:
+ The /sys/kernel/uids/<uid>/cpu_shares tunable is used
+ to set the cpu bandwidth a user is allowed. This is a
+ propotional value. What that means is that if there
+ are two users logged in, each with an equal number of
+ shares, then they will get equal CPU bandwidth. Another
+ example would be, if User A has shares = 1024 and user
+ B has shares = 2048, User B will get twice the CPU
+ bandwidth user A will. For more details refer
+ Documentation/sched-design-CFS.txt
--
regards,
Dhaval
--
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