linux-kernel - Re: [PATCH v2 03/10] x86/mm: Give each mm TLB flush generation a unique ID

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Message-ID: <06ea73a2-f724-5b3e-5d9d-143d91ba94ae@intel.com>
Date:   Wed, 14 Jun 2017 08:54:55 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andy Lutomirski <luto@...nel.org>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Rik van Riel <riel@...hat.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v2 03/10] x86/mm: Give each mm TLB flush generation a
 unique ID

On 06/13/2017 09:56 PM, Andy Lutomirski wrote:
>  typedef struct {
> +	/*
> +	 * ctx_id uniquely identifies this mm_struct.  A ctx_id will never
> +	 * be reused, and zero is not a valid ctx_id.
> +	 */
> +	u64 ctx_id;

Ahh, and you need this because an mm itself might get reused by being
freed and reallocated?