Messages in this thread | | | Date | Tue, 18 Jan 2011 13:20:03 +0530 | From | Ciju Rajan K <> | Subject | Re: [RFC][PATCH 0/2 v1.0]sched: updating /proc/schedstat |
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On 01/18/2011 12:59 PM, Satoru Takeuchi wrote: > Hi Ciju, > Hello Satoru,
> I don't like this patches because it breaks backward compatibility. > If there are any user who uses these fields, they can't get > the information which these fields provides from this time on. > In this context, `user' means not only application but also the person > who refers to /proc/schedstat directly.
This patch set removes only those fields which are currently not in use. If you observe the fields of /proc/schedstat the following fields are not being updated.
For each cpu:
2) sched_switch
For each domain:
28) sd->sbe_count 29) sd->sbe_balanced 30) sd->sbe_pushed 31) sd->sbf_count 32) sd->sbf_balanced 33) sd->sbf_pushed 36) sd->ttwu_move_balance
The serial numbers indicate the positions of the fields in version 15 of/proc/schedstat > > In fact, although I can't say "command XXX refers to these field", > I sometimes check {sbe_*,sbf_*} to confirm load_balance behavior > by issuing, for example, > > =============================================================================== > watch /proc/schedstat > =============================================================================== > > or > > =============================================================================== > while true ; do > cat /proc/schedstat >>schedstat_log > sleep 10 > done > ===============================================================================
Only concern is that the user might have to update the scripts to get the correct position of the fields. Which anyway the scripts have to take care depending on the version of /proc/schedstat.
I hope this addresses your concern.
-Ciju > > Thanks > Satoru > >> >> >>> >>> Also, attachment fail. >> >> It should be ok now. >> >> -Ciju >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ >> >> > >
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