linux-kernel - Re: [PATCH v4 07/12] mm: enable lazy

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Message-ID: <ef0cd4bc-1a37-4755-8957-d8a7e5c4564e-agordeev@linux.ibm.com>
Date: Wed, 29 Oct 2025 17:41:12 +0100
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Kevin Brodsky <kevin.brodsky@....com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andreas Larsson <andreas@...sler.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        David Woodhouse <dwmw2@...radead.org>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jann Horn <jannh@...gle.com>, Juergen Gross <jgross@...e.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>, Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...nel.org>, Nicholas Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ryan Roberts <ryan.roberts@....com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>, Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>, Yeoreum Yun <yeoreum.yun@....com>,
        linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        sparclinux@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org
Subject: Re: [PATCH v4 07/12] mm: enable lazy_mmu sections to nest

On Wed, Oct 29, 2025 at 10:09:04AM +0000, Kevin Brodsky wrote:

Hi Kevin,

> +#ifdef CONFIG_ARCH_HAS_LAZY_MMU_MODE
> +static inline bool in_lazy_mmu_mode(void)
> +{
> +	return current->lazy_mmu_state.active;

Whether (nesting_level > 0) is more correct check?
Otherwise, it returns false while in paused mode.

May be check both nesting_level and active and also introduce
in_lazy_mmu_paused_mode() right away to avoid any confusion?

> +}
> +#else
> +static inline bool in_lazy_mmu_mode(void)
> +{
> +	return false;
> +}
> +#endif
> +
>  extern struct pid *cad_pid;
>  
>  /*

Thanks!