linux-kernel - Re: [PATCH] x86/mm/tlb: Skip tracing when flush is not done

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Date:   Mon, 11 Jul 2022 15:50:23 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Nadav Amit <nadav.amit@...il.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Linux MM <linux-mm@...ck.org>,
        Nadav Amit <namit@...are.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] x86/mm/tlb: Skip tracing when flush is not done

On 7/10/22 16:33, Nadav Amit wrote:
> From: Nadav Amit <namit@...are.com>
> 
> Currently, if flush_tlb_func() does not flush for some reason, the
> tracing of the flush will be done only in certain cases, depending on
> the reason of the flush. Be consistent and just do not trace in all
> cases when the flush was eventually not done.
> 
> Suggested-by: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
> Cc: Andy Lutomirski <luto@...nel.org>
> Signed-off-by: Nadav Amit <namit@...are.com>


Can you remove this comment, too?

>   	/* Tracing is done in a unified manner to reduce the code size */

> -done:
>   	trace_tlb_flush(!local ? TLB_REMOTE_SHOOTDOWN :
>   				(f->mm == NULL) ? TLB_LOCAL_SHOOTDOWN :
>   						  TLB_LOCAL_MM_SHOOTDOWN,