* turning on -fno-inline-functions-called-once
@ 2008-10-06 18:58 Steve Dickson
2008-10-06 19:04 ` Kyle McMartin
2008-10-07 3:30 ` Dave Jones
0 siblings, 2 replies; 5+ messages in thread
From: Steve Dickson @ 2008-10-06 18:58 UTC (permalink / raw)
To: Fedora Kernel List; +Cc: SystemTAP
A while back, I believe back during the last FUDCon in Raleigh I talked with kylem and davej about turning off the "inline-functions-called-once" which inlines functions that are only called once. Turning off this optimization would allow SystemTap to work much better, especially in the NFS code...
Kyle/Dave (or anybody else) remember if anything came out from that conversation?
Is there any reason we should not remove this optimization?
steved.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: turning on -fno-inline-functions-called-once
2008-10-06 18:58 turning on -fno-inline-functions-called-once Steve Dickson
@ 2008-10-06 19:04 ` Kyle McMartin
2008-10-07 13:04 ` Steve Dickson
2008-10-07 3:30 ` Dave Jones
1 sibling, 1 reply; 5+ messages in thread
From: Kyle McMartin @ 2008-10-06 19:04 UTC (permalink / raw)
To: Steve Dickson; +Cc: Fedora Kernel List, SystemTAP
On Mon, Oct 06, 2008 at 02:56:04PM -0400, Steve Dickson wrote:
> A while back, I believe back during the last FUDCon in Raleigh I talked with kylem and davej about turning off the "inline-functions-called-once" which inlines functions that are only called once. Turning off this optimization would allow SystemTap to work much better, especially in the NFS code...
>
> Kyle/Dave (or anybody else) remember if anything came out from that conversation?
>
> Is there any reason we should not remove this optimization?
>
I don't mind the idea of turning this off in debug builds, but I'm iffy
about turning the optimization off in release builds...
regards, Kyle
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: turning on -fno-inline-functions-called-once
2008-10-06 18:58 turning on -fno-inline-functions-called-once Steve Dickson
2008-10-06 19:04 ` Kyle McMartin
@ 2008-10-07 3:30 ` Dave Jones
1 sibling, 0 replies; 5+ messages in thread
From: Dave Jones @ 2008-10-07 3:30 UTC (permalink / raw)
To: Steve Dickson; +Cc: Fedora Kernel List, SystemTAP
On Mon, Oct 06, 2008 at 02:56:04PM -0400, Steve Dickson wrote:
> A while back, I believe back during the last FUDCon in Raleigh I
> talked with kylem and davej about turning off the
> "inline-functions-called-once" which inlines functions that are only
> called once. Turning off this optimization would allow SystemTap to work
> much better, especially in the NFS code...
>
> Kyle/Dave (or anybody else) remember if anything came out from that conversation?
I forgot all about that conversation.
> Is there any reason we should not remove this optimization?
I'd be really surprised if it's actually even measurable on modern CPUs.
Dave
--
http://www.codemonkey.org.uk
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: turning on -fno-inline-functions-called-once
2008-10-06 19:04 ` Kyle McMartin
@ 2008-10-07 13:04 ` Steve Dickson
2008-10-07 13:58 ` Kyle McMartin
0 siblings, 1 reply; 5+ messages in thread
From: Steve Dickson @ 2008-10-07 13:04 UTC (permalink / raw)
To: Fedora Kernel List; +Cc: SystemTAP
Kyle McMartin wrote:
> On Mon, Oct 06, 2008 at 02:56:04PM -0400, Steve Dickson wrote:
>> A while back, I believe back during the last FUDCon in Raleigh I talked with kylem and davej about turning off the "inline-functions-called-once" which inlines functions that are only called once. Turning off this optimization would allow SystemTap to work much better, especially in the NFS code...
>>
>> Kyle/Dave (or anybody else) remember if anything came out from that conversation?
>>
>> Is there any reason we should not remove this optimization?
>>
>
> I don't mind the idea of turning this off in debug builds, but I'm iffy
> about turning the optimization off in release builds...
Understandable... but its a catch-22... If its not turned off in release builds then we can't use systemtap [to debug NFS] in production environments which the true value systemtap brings to the table... imho...
steved.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: turning on -fno-inline-functions-called-once
2008-10-07 13:04 ` Steve Dickson
@ 2008-10-07 13:58 ` Kyle McMartin
0 siblings, 0 replies; 5+ messages in thread
From: Kyle McMartin @ 2008-10-07 13:58 UTC (permalink / raw)
To: Steve Dickson; +Cc: Fedora Kernel List, SystemTAP
On Tue, Oct 07, 2008 at 09:02:08AM -0400, Steve Dickson wrote:
>
>
> Kyle McMartin wrote:
> > On Mon, Oct 06, 2008 at 02:56:04PM -0400, Steve Dickson wrote:
> >> A while back, I believe back during the last FUDCon in Raleigh I talked with kylem and davej about turning off the "inline-functions-called-once" which inlines functions that are only called once. Turning off this optimization would allow SystemTap to work much better, especially in the NFS code...
> >>
> >> Kyle/Dave (or anybody else) remember if anything came out from that conversation?
> >>
> >> Is there any reason we should not remove this optimization?
> >>
> >
> > I don't mind the idea of turning this off in debug builds, but I'm iffy
> > about turning the optimization off in release builds...
> Understandable... but its a catch-22... If its not turned off in release builds then we can't use systemtap [to debug NFS] in production environments which the true value systemtap brings to the table... imho...
>
Is this liable to actually occur, though?
I mean, I don't have any problem with it per se... I'd just be suprised,
is all.
regards, Kyle
^ permalink raw reply [flat|nested] 5+ messages in thread
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2008-10-06 18:58 turning on -fno-inline-functions-called-once Steve Dickson
2008-10-06 19:04 ` Kyle McMartin
2008-10-07 13:04 ` Steve Dickson
2008-10-07 13:58 ` Kyle McMartin
2008-10-07 3:30 ` Dave Jones
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