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Re: [PATCH v2] x86: Use 32-bit counter for TLB clock on debug builds
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 13 Jan 2026 14:18:22 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Tue, 13 Jan 2026 14:18:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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".
~Andrew
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