netdev - Re: [PATCH v2 06/12] mm/execmem: introduce execmem_data

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Message-ID: <20230620105104.60cb64d8@gandalf.local.home>
Date: Tue, 20 Jun 2023 10:51:04 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>, Mike Rapoport
 <rppt@...nel.org>, linux-kernel@...r.kernel.org, Andrew Morton
 <akpm@...ux-foundation.org>, Catalin Marinas <catalin.marinas@....com>,
 Christophe Leroy <christophe.leroy@...roup.eu>, "David S. Miller"
 <davem@...emloft.net>, Dinh Nguyen <dinguyen@...nel.org>, Heiko Carstens
 <hca@...ux.ibm.com>, Helge Deller <deller@....de>, Huacai Chen
 <chenhuacai@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>, Mark Rutland
 <mark.rutland@....com>, Michael Ellerman <mpe@...erman.id.au>, Nadav Amit
 <nadav.amit@...il.com>, "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
 Palmer Dabbelt <palmer@...belt.com>, Puranjay Mohan <puranjay12@...il.com>,
 Rick Edgecombe <rick.p.edgecombe@...el.com>, Russell King
 <linux@...linux.org.uk>, Song Liu <song@...nel.org>, Thomas Bogendoerfer
 <tsbogend@...ha.franken.de>, Will Deacon <will@...nel.org>,
 bpf@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mips@...r.kernel.org, linux-mm@...ck.org,
 linux-modules@...r.kernel.org, linux-parisc@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
 loongarch@...ts.linux.dev, netdev@...r.kernel.org,
 sparclinux@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v2 06/12] mm/execmem: introduce execmem_data_alloc()

On Mon, 19 Jun 2023 02:43:58 +0200
Thomas Gleixner <tglx@...utronix.de> wrote:

> Now you might argue that it _is_ a "hotpath" due to the BPF usage, but
> then even more so as any intermediate wrapper which converts from one
> data representation to another data representation is not going to
> increase performance, right?

Just as a side note. BPF can not attach its return calling code to
functions that have more than 6 parameters (3 on 32 bit x86), because of
the way BPF return path trampoline works. It is a requirement that all
parameters live in registers, and none on the stack.

-- Steve