From: Peter Zijlstra <peterz@infradead.org>
To: Menglong Dong <menglong8.dong@gmail.com>
Cc: rostedt@goodmis.org, mark.rutland@arm.com,
alexei.starovoitov@gmail.com, catalin.marinas@arm.com,
will@kernel.org, mhiramat@kernel.org, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com, ast@kernel.org,
daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev,
eddyz87@gmail.com, yonghong.song@linux.dev,
john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me,
jolsa@kernel.org, davem@davemloft.net, dsahern@kernel.org,
mathieu.desnoyers@efficios.com, nathan@kernel.org,
nick.desaulniers+lkml@gmail.com, morbo@google.com,
samitolvanen@google.com, kees@kernel.org,
dongml2@chinatelecom.cn, akpm@linux-foundation.org,
riel@surriel.com, rppt@kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
bpf@vger.kernel.org, netdev@vger.kernel.org,
llvm@lists.linux.dev
Subject: Re: [PATCH v4 1/4] x86/ibt: factor out cfi and fineibt offset
Date: Tue, 4 Mar 2025 10:42:20 +0100 [thread overview]
Message-ID: <20250304094220.GC11590@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <CADxym3bS_6jpGC3vLAAyD20GsR+QZofQw0_GgKT8nN3c-HqG-g@mail.gmail.com>
On Tue, Mar 04, 2025 at 03:47:45PM +0800, Menglong Dong wrote:
> We don't have to select FUNCTION_ALIGNMENT_32B, so the
> worst case is to increase ~2.2%.
>
> What do you think?
Well, since I don't understand what you need this for at all, I'm firmly
on the side of not doing this.
What actual problem is being solved with this meta data nonsense? Why is
it worth blowing up our I$ footprint over.
Also note, that if you're going to be explaining this, start from
scratch, as I have absolutely 0 clues about BPF and such.
next prev parent reply other threads:[~2025-03-04 9:42 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-03 13:28 [PATCH v4 0/4] per-function storage support Menglong Dong
2025-03-03 13:28 ` [PATCH v4 1/4] x86/ibt: factor out cfi and fineibt offset Menglong Dong
2025-03-03 16:54 ` Peter Zijlstra
2025-03-04 1:10 ` Menglong Dong
2025-03-04 5:38 ` Peter Zijlstra
2025-03-04 6:16 ` Peter Zijlstra
2025-03-04 7:47 ` Menglong Dong
2025-03-04 8:41 ` Menglong Dong
2025-03-04 9:42 ` Peter Zijlstra [this message]
2025-03-04 14:52 ` H. Peter Anvin
2025-03-05 1:19 ` Menglong Dong
2025-03-05 8:29 ` H. Peter Anvin
2025-03-05 8:49 ` Menglong Dong
2025-03-05 15:03 ` Steven Rostedt
2025-03-06 2:58 ` Menglong Dong
2025-03-06 3:39 ` Alexei Starovoitov
2025-03-06 8:50 ` Menglong Dong
2025-03-23 3:51 ` Menglong Dong
2025-03-03 13:28 ` [PATCH v4 2/4] add per-function metadata storage support Menglong Dong
2025-03-03 13:28 ` [PATCH v4 3/4] x86: implement per-function metadata storage for x86 Menglong Dong
2025-03-03 13:28 ` [PATCH v4 4/4] arm64: implement per-function metadata storage for arm64 Menglong Dong
2025-03-03 21:40 ` Sami Tolvanen
2025-03-04 1:21 ` Menglong Dong
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