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[Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- To: Steven Rostedt <rostedt@xxxxxxxxxxx>
- From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
- Date: Thu, 06 Oct 2011 14:42:37 -0700
- Cc: the arch/x86 maintainers <x86@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, David Daney <david.daney@xxxxxxxxxx>, peterz@xxxxxxxxxxxxx, Jason Baron <jbaron@xxxxxxxxxx>, Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>, Richard Henderson <rth@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Michael Ellerman <michael@xxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>
- Delivery-date: Thu, 06 Oct 2011 14:43:35 -0700
- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
On 10/06/2011 12:28 PM, Steven Rostedt wrote:
>> (2) Always reserve 5 bytes of space, but if the distance is small enough
>> patch in a 2-byte jump. That doesn't help with the icache footprint.
> I don't think this one is worth it.
I disagree. This is what I benchmarked as having a 5% improvement. If
squashing out the padding helps, then that's a separate optimisation.
J
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- References:
- [Xen-devel] [PATCH RFC V2 0/5] jump-label: allow early jump_label_enable()
- From: Jeremy Fitzhardinge
- [Xen-devel] [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- From: Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- From: Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- From: Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- From: Jeremy Fitzhardinge
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
- [Xen-devel] Re: [PATCH RFC V2 3/5] jump_label: if a key has already been initialized, don't nop it out
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