linux-kernel - Re: [PATCH] mm: Add new vma flag VM_LOCAL

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Message-ID: <428e2683-42df-c810-eb5f-0c6841f50836@linux.intel.com>
Date:   Tue, 15 May 2018 07:19:38 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Boaz Harrosh <boazh@...app.com>, Jeff Moyer <jmoyer@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>, Jan Kara <jack@...e.cz>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Amit Golander <Amit.Golander@...app.com>
Subject: Re: [PATCH] mm: Add new vma flag VM_LOCAL_CPU

On 05/14/2018 10:28 AM, Boaz Harrosh wrote:
> The VM_LOCAL_CPU flag tells the Kernel that the vma will be used
> from a single-core only, and therefore invalidation (flush_tlb) of
> PTE(s) need not be a wide CPU scheduling.

This doesn't work on x86.  We load TLB entries for lots of reasons, even
if the PTE is never "used".  Is there another architecture you had in
mind that has more predictable TLB population behavior?