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Message-ID: <20230406132928.GM386572@hirez.programming.kicks-ass.net>
Date:   Thu, 6 Apr 2023 15:29:28 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Marcelo Tosatti <mtosatti@...hat.com>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Yair Podemsky <ypodemsk@...hat.com>, linux@...linux.org.uk,
        mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
        hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
        davem@...emloft.net, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, will@...nel.org, aneesh.kumar@...ux.ibm.com,
        akpm@...ux-foundation.org, arnd@...db.de, keescook@...omium.org,
        paulmck@...nel.org, jpoimboe@...nel.org, samitolvanen@...gle.com,
        ardb@...nel.org, juerg.haefliger@...onical.com,
        rmk+kernel@...linux.org.uk, geert+renesas@...der.be,
        tony@...mide.com, linus.walleij@...aro.org,
        sebastian.reichel@...labora.com, nick.hawkins@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, vschneid@...hat.com, dhildenb@...hat.com,
        alougovs@...hat.com
Subject: Re: [PATCH 3/3] mm/mmu_gather: send tlb_remove_table_smp_sync IPI
 only to CPUs in kernel mode

On Thu, Apr 06, 2023 at 09:38:50AM -0300, Marcelo Tosatti wrote:

> > To actually hit this path you're doing something really dodgy.
> 
> Apparently khugepaged is using the same infrastructure:
> 
> $ grep tlb_remove_table khugepaged.c 
> 	tlb_remove_table_sync_one();
> 	tlb_remove_table_sync_one();
> 
> So just enabling khugepaged will hit that path.

Urgh, WTF..

Let me go read that stuff :/

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