linux-kernel - Re: [PATCH bpf-next v4 0/3] bpf, arm64: use BPF prog pack allocator in BPF JIT

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Message-ID: <ZKMCFtlfJA1LfGNJ@FVFF77S0Q05N>
Date:   Mon, 3 Jul 2023 18:15:02 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Puranjay Mohan <puranjay12@...il.com>, ast@...nel.org,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        catalin.marinas@....com, bpf@...r.kernel.org, kpsingh@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf-next v4 0/3] bpf, arm64: use BPF prog pack allocator
 in BPF JIT

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.