linux-kernel - Re: [RFC PATCH, x86]: Disable CPA cache flush for selfsnoop targets

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Message-ID: <20190715225305.GI32439@tassilo.jf.intel.com>
Date:   Mon, 15 Jul 2019 15:53:05 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Uros Bizjak <ubizjak@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>
Subject: Re: [RFC PATCH, x86]: Disable CPA cache flush for selfsnoop targets

> I haven't tested on a real kernel with i915.  Does i915 really hit
> this code path?  Does it happen more than once or twice at boot?

Yes some workloads allocate/free a lot of write combined memory
for graphics objects.

-Andi