From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-172.mta1.migadu.com (out-172.mta1.migadu.com [95.215.58.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7FF1A28C2DD for ; Wed, 19 Nov 2025 02:47:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763520466; cv=none; b=lWTJ/BFLeTuT2EKkwSL7qOGwG0vkeJ3G6uoj0NS0qOAaKcue3jVHTyrru/x4trJvLh3Z05VP7iqRXEWtWk8/O4/z94q8ygxTNDlPUsFiJqB/GkHz6uCQHVCeqOkJv8jgTTpxf13cVDQmswA7uKygDYr7j0zQ8G38SiBqRDeCex4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763520466; c=relaxed/simple; bh=8qkxxhQPcQks1IHDKUkvEk1ro7Emwwx0ztqcHyihPFY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Aiy+WlMZZxdqDDxhV8qyMA1WsjcbXFp/GD46aBgyLVm2kpOyOjpyU57gI22yCSvdPmMaDMT06uNxLYL/dRcuCMX/VBwEY/4It9rTm77pX3IlfIaiNbyc8D2EQVEabToYbuWA0yM4gX+2hZ/0Wg7akDOQSmt7CFMZ/jJqqRyw+QM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=psQLFmmW; arc=none smtp.client-ip=95.215.58.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="psQLFmmW" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1763520452; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8qkxxhQPcQks1IHDKUkvEk1ro7Emwwx0ztqcHyihPFY=; b=psQLFmmWtA1TxsXjZoKnUnflhodtiX/TDRqnab2swyoA39b4Y5kN0m9s0ZDCbWHK8nCFmQ +dMfB2yCIHoiVOzxb/2M/jq2xfpmfS+zMb6rAz2PWeyB5lKJHyIdKvZEvWH38vFG91gbUp G38GmpkvJuZFJtmr+CbhPevSk9i7nMc= From: Menglong Dong To: Menglong Dong , Alexei Starovoitov , Leon Hwang Cc: Alexei Starovoitov , Steven Rostedt , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Eduard , Song Liu , Yonghong Song , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , jiang.biao@linux.dev, bpf , LKML , linux-trace-kernel Subject: Re: [PATCH bpf-next v3 0/6] bpf trampoline support "jmp" mode Date: Wed, 19 Nov 2025 10:47:11 +0800 Message-ID: <8606158.T7Z3S40VBb@7950hx> In-Reply-To: References: <20251118123639.688444-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" X-Migadu-Flow: FLOW_OUT On 2025/11/19 08:28, Alexei Starovoitov wrote: > On Tue, Nov 18, 2025 at 4:36=E2=80=AFAM Menglong Dong wrote: > > > > As we can see above, the performance of fexit increase from 80.544M/s to > > 136.540M/s, and the "fmodret" increase from 78.301M/s to 159.248M/s. >=20 > Nice! Now we're talking. >=20 > I think arm64 CPUs have a similar RSB-like return address predictor. > Do we need to do something similar there? > The question is not targeted to you, Menglong, > just wondering. I did some research before, and I find that most arch have such RSB-like stuff. I'll have a look at the loongarch later(maybe after the LPC, as I'm forcing on the English practice), and Leon is following the arm64. =46or the other arch, we don't have the machine, and I think it needs some else help. Thanks! Menglong Dong >=20 >=20