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Date:   Mon, 3 Jul 2023 18:15:02 +0100
From:   Mark Rutland <mark.rutland@arm.com>
To:     Daniel Borkmann <daniel@iogearbox.net>
Cc:     Puranjay Mohan <puranjay12@gmail.com>, ast@kernel.org,
        andrii@kernel.org, martin.lau@linux.dev, song@kernel.org,
        catalin.marinas@arm.com, bpf@vger.kernel.org, kpsingh@kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH bpf-next v4 0/3] bpf, arm64: use BPF prog pack allocator
 in BPF JIT
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 <7e05efe1-0af0-1896-6f6f-dcb02ed8ca27@iogearbox.net>
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On Mon, Jul 03, 2023 at 06:40:21PM +0200, Daniel Borkmann wrote:
> Hi Mark,

Hi Daniel,

> On 6/26/23 10:58 AM, Puranjay Mohan wrote:
> > BPF programs currently consume a page each on ARM64. For systems with many BPF
> > programs, this adds significant pressure to instruction TLB. High iTLB pressure
> > usually causes slow down for the whole system.
> > 
> > Song Liu introduced the BPF prog pack allocator[1] to mitigate the above issue.
> > It packs multiple BPF programs into a single huge page. It is currently only
> > enabled for the x86_64 BPF JIT.
> > 
> > This patch series enables the BPF prog pack allocator for the ARM64 BPF JIT.

> If you get a chance to take another look at the v4 changes from Puranjay and
> in case they look good to you reply with an Ack, that would be great.

Sure -- this is on my queue of things to look at; it might just take me a few
days to get the time to give this a proper look.

Thanks,
Mark.