linux-kernel - Re: [PATCH V2 2/2] mm/migration: Add trace events for base page and HugeTLB migrations

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Message-ID: <Ye/7EWJ576hdkWDg@casper.infradead.org>
Date:   Tue, 25 Jan 2022 13:28:49 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        naoya.horiguchi@...ux.dev, rostedt@...dmis.org,
        Ingo Molnar <mingo@...hat.com>, Zi Yan <ziy@...dia.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        John Hubbard <jhubbard@...dia.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/2] mm/migration: Add trace events for base page and
 HugeTLB migrations

On Tue, Jan 25, 2022 at 08:38:25AM +0530, Anshuman Khandual wrote:
> +		TP_printk("addr=%lx, pte=%lx order=%d", __entry->addr, __entry->pte, __entry->order)

In these days of increasingly advanced Rowhammer attacks, is it wise
to let userspace know exactly which physical addresses are being
used for virtual addresses?