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From: Dave Hansen <dave.hansen@intel.com>
To: Peter Zijlstra <peterz@infradead.org>, Rik van Riel <riel@surriel.com>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org, bp@alien8.de,
	dave.hansen@linux.intel.com, zhengqi.arch@bytedance.com,
	nadav.amit@gmail.com, thomas.lendacky@amd.com,
	kernel-team@meta.com, linux-mm@kvack.org,
	akpm@linux-foundation.org, jannh@google.com,
	mhklinux@outlook.com, andrew.cooper3@citrix.com
Subject: Re: [PATCH v6 09/12] x86/mm: enable broadcast TLB invalidation for multi-threaded processes
Date: Tue, 21 Jan 2025 10:48:44 -0800	[thread overview]
Message-ID: <672ff78c-d93f-48d9-936e-e86b3d9d9dbc@intel.com> (raw)
In-Reply-To: <20250121095507.GB5388@noisy.programming.kicks-ass.net>

On 1/21/25 01:55, Peter Zijlstra wrote:
> Can't we just start with a very simple constant test and poke at things
> if/when its found to not work?

I'd prefer something simpler for now, too.

Let's just pick a sane number, maybe 16 or 32 for now, make it pokeable
in debugfs and make sure we have a way to tell when the PCID space is
exhausted.

Then we try and design a solution for the _actual_ cases where folks are
exhausting it.


  parent reply	other threads:[~2025-01-21 18:48 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-20  2:40 [PATCH v6 00/12] AMD broadcast TLB invalidation Rik van Riel
2025-01-20  2:40 ` [PATCH v6 01/12] x86/mm: make MMU_GATHER_RCU_TABLE_FREE unconditional Rik van Riel
2025-01-20 19:32   ` David Hildenbrand
2025-01-20  2:40 ` [PATCH v6 02/12] x86/mm: remove pv_ops.mmu.tlb_remove_table call Rik van Riel
2025-01-20 19:47   ` David Hildenbrand
2025-01-21  1:03     ` Rik van Riel
2025-01-21  7:46       ` David Hildenbrand
2025-01-21  8:54         ` Peter Zijlstra
2025-01-22 15:48           ` Rik van Riel
2025-01-20  2:40 ` [PATCH v6 03/12] x86/mm: consolidate full flush threshold decision Rik van Riel
2025-01-20  2:40 ` [PATCH v6 04/12] x86/mm: get INVLPGB count max from CPUID Rik van Riel
2025-01-20  2:40 ` [PATCH v6 05/12] x86/mm: add INVLPGB support code Rik van Riel
2025-01-21  9:45   ` Peter Zijlstra
2025-01-22 16:58     ` Rik van Riel
2025-01-20  2:40 ` [PATCH v6 06/12] x86/mm: use INVLPGB for kernel TLB flushes Rik van Riel
2025-01-20  2:40 ` [PATCH v6 07/12] x86/tlb: use INVLPGB in flush_tlb_all Rik van Riel
2025-01-20  2:40 ` [PATCH v6 08/12] x86/mm: use broadcast TLB flushing for page reclaim TLB flushing Rik van Riel
2025-01-20  2:40 ` [PATCH v6 09/12] x86/mm: enable broadcast TLB invalidation for multi-threaded processes Rik van Riel
2025-01-20 14:02   ` Nadav Amit
2025-01-20 16:09     ` Rik van Riel
2025-01-20 20:04       ` Nadav Amit
2025-01-20 22:44         ` Rik van Riel
2025-01-21  7:31           ` Nadav Amit
2025-01-21  9:55   ` Peter Zijlstra
2025-01-21 10:33     ` Peter Zijlstra
2025-01-23  1:40       ` Rik van Riel
2025-01-21 18:48     ` Dave Hansen [this message]
2025-01-22  8:38   ` Peter Zijlstra
2025-01-23  1:13     ` Rik van Riel
2025-01-23  9:07       ` Peter Zijlstra
2025-01-23 12:42         ` Rik van Riel
2025-01-20  2:40 ` [PATCH v6 10/12] x86,tlb: do targeted broadcast flushing from tlbbatch code Rik van Riel
2025-01-20  2:40 ` [PATCH v6 11/12] x86/mm: enable AMD translation cache extensions Rik van Riel
2025-01-20  2:40 ` [PATCH v6 12/12] x86/mm: only invalidate final translations with INVLPGB Rik van Riel
2025-01-20  5:58 ` [PATCH v6 00/12] AMD broadcast TLB invalidation Michael Kelley
2025-01-24 11:41 ` Manali Shukla

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