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Re: [PATCH v2] x86: Use 32-bit counter for TLB clock on debug builds
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 13 Jan 2026 15:26:51 +0100
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- Cc: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Tue, 13 Jan 2026 14:27:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Jan 13, 2026 at 02:18:22PM +0000, Andrew Cooper wrote:
> On 13/01/2026 2:17 pm, Roger Pau Monné wrote:
> > On Tue, Jan 13, 2026 at 01:09:58PM +0100, Alejandro Vallejo wrote:
> >> Debug builds traditionally ship with a 10-bit counter for the TLB
> >> clock. This forces global TLB shootdowns with high frequency, making
> >> debug builds unsuitable for any form of real time testing.
> >>
> >> Remove this quirk, unifying release and debug under a wide counter.
> > I wonder if it makes any sense to provide this as a Kconfig tunable,
> > set to 32bit width for both debug and release builds?
>
> That was v1, and both Jan and myself said "prefer not".
We already have this fixed to 32-bit width in XenServer patch queue for
both release and debug builds. Certainly no strong opinion, I never
had the need to tweak this, and anyone that has to will likely be
perfectly fine with adjusting the code.
Thanks, Roger.
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