linux-kernel - Re: [RFC PATCH 11/37] x86/mm: attempt speculative mm faults first

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Message-ID: <YG3GTI8j1ohk4NhS@hirez.programming.kicks-ass.net>
Date:   Wed, 7 Apr 2021 16:48:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Michel Lespinasse <michel@...pinasse.org>
Cc:     Linux-MM <linux-mm@...ck.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Rik van Riel <riel@...riel.com>,
        Paul McKenney <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Rom Lemarchand <romlem@...gle.com>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 11/37] x86/mm: attempt speculative mm faults first

On Tue, Apr 06, 2021 at 06:44:36PM -0700, Michel Lespinasse wrote:
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -1219,6 +1219,8 @@ void do_user_addr_fault(struct pt_regs *regs,
>  	struct mm_struct *mm;
>  	vm_fault_t fault;
>  	unsigned int flags = FAULT_FLAG_DEFAULT;
> +	struct vm_area_struct pvma;

That's 200 bytes on-stack... I suppose that's just about acceptible, but
perhaps we need a comment in struct vm_area_struct to make people aware
this things lives on-stack and size really is an issue now.