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Re: [PATCH v2] x86: Use 32-bit counter for TLB clock on debug builds
- To: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 13 Jan 2026 15:17:29 +0100
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Tue, 13 Jan 2026 14:17:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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?
Not sure whether there's a ton of interest in stressing the flushing
however, and by then it's a small hack to adjust the code itself.
Regards, Roger.
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