From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 496DB14F6C; Mon, 22 Jan 2024 07:42:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705909327; cv=none; b=t5Sfz5HNorVcrktsf8AlMjo0QV76sae2q72AvDQY+2LWEPkH6XcOzAR4lvPiGHMxF5ciJUasLer3bsYa/Y1UfpKEj456seFhhaVlj6ZN/SkXcrZLR2w43oiv3BK/c/LLpS1QxaXnOs2xVSe6JjhyQ70mcoFhnbE14Ya3LCUYQW8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705909327; c=relaxed/simple; bh=6q+Ae298LK6Fwx9w1Hxqg+/TcqF4+MMHBmWb7Tw8+hU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=uQ1aSF46tk2aWy4OvE+gENAnpX36Khxre6ANhFgF3WpMnv5uKJSZ47FGArOukW+tj67uEYW0EXe+8fLu6W5OyCbdkmDJOn2fEO+cFlBc53a0sRUOZ//MKboctanu6k7iHoyCWR5lCgKo4Orm+cjwVGy3y2/E2vKVotdSGqSzwcE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jOnqDMRd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jOnqDMRd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B284C43394; Mon, 22 Jan 2024 07:41:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705909326; bh=6q+Ae298LK6Fwx9w1Hxqg+/TcqF4+MMHBmWb7Tw8+hU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jOnqDMRdvXuWTje7hxQN2dCLE7PzYUq8rAYWennGmg2eWAJlF8wYxF7WITOD93XyX kOi7HC3t/JBdyraClA4q5IQ6eCe0QP9DQEOOLu5rJzGGtUakerutvskNDSebyStAJZ z+mnBJqfh9Fcq+5rh+Kc2KPiYn9xLCRpmCpxOFhvwp4xLOdS0I9/a1r1ZusQ+JEtay eerJbS9dnoFfr2YnDqeIifjrZ8RFwgs3XLP/I8Wfw7PBHR0aHCQTC5FxayDUKgCqE/ I+Nux9qFYloyZL8LPJSk6tchB/m6C22f9IUgs1mhO9obbBZ8/pniLuN0IIT85I3k0j 4+4RMm18KCn0Q== Date: Mon, 22 Jan 2024 09:41:40 +0200 From: Mike Rapoport To: Shijie Huang Cc: Yury Norov , Huang Shijie , gregkh@linuxfoundation.org, patches@amperecomputing.com, rafael@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, kuba@kernel.org, vschneid@redhat.com, mingo@kernel.org, akpm@linux-foundation.org, vbabka@suse.cz, tglx@linutronix.de, jpoimboe@kernel.org, ndesaulniers@google.com, mikelley@microsoft.com, mhiramat@kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, chenhuacai@kernel.org, jiaxun.yang@flygoat.com, linux-mips@vger.kernel.org, cl@os.amperecomputing.com Subject: Re: [PATCH] NUMA: Early use of cpu_to_node() returns 0 instead of the correct node id Message-ID: References: <20240119033227.14113-1-shijie@os.amperecomputing.com> <1cd078fd-c345-4d85-a92f-04c806c20efa@amperemail.onmicrosoft.com> Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Fri, Jan 19, 2024 at 04:50:53PM +0800, Shijie Huang wrote: > > 在 2024/1/19 16:42, Mike Rapoport 写道: > > Is there a fundamental reason to have early_cpu_to_node() at all? > > The early_cpu_to_node does not work on some ARCHs (which support the NUMA), > such as  SPARC, MIPS and S390. My question was why we need early_cpu_to_node() at all and why can't we use cpu_to_node() early on arches that do have it. > Thanks > > Huang Shijie > > > It seems that all the mappings are known by the end of setup_arch() and the > > initialization of numa_node can be moved earlier. > > > > I would also initialize the numa_node with NUMA_NO_NODE at declaration, > > > > so that if someone calls cpu_to_node() before the variable is properly > > > > initialized at runtime, he'll get NO_NODE, which is obviously an error. > > > Even we set the numa_node with NUMA_NO_NODE, it does not always produce > > > error. > > > > > > Please see the alloc_pages_node(). > > > > > > > > > Thanks > > > > > > Huang Shijie > > > -- Sincerely yours, Mike. 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Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rRowd-00AtiX-1e; Mon, 22 Jan 2024 07:42:11 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rRowa-00Atfr-1O; Mon, 22 Jan 2024 07:42:09 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id D8F62610E7; Mon, 22 Jan 2024 07:42:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B284C43394; Mon, 22 Jan 2024 07:41:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705909326; bh=6q+Ae298LK6Fwx9w1Hxqg+/TcqF4+MMHBmWb7Tw8+hU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jOnqDMRdvXuWTje7hxQN2dCLE7PzYUq8rAYWennGmg2eWAJlF8wYxF7WITOD93XyX kOi7HC3t/JBdyraClA4q5IQ6eCe0QP9DQEOOLu5rJzGGtUakerutvskNDSebyStAJZ z+mnBJqfh9Fcq+5rh+Kc2KPiYn9xLCRpmCpxOFhvwp4xLOdS0I9/a1r1ZusQ+JEtay eerJbS9dnoFfr2YnDqeIifjrZ8RFwgs3XLP/I8Wfw7PBHR0aHCQTC5FxayDUKgCqE/ I+Nux9qFYloyZL8LPJSk6tchB/m6C22f9IUgs1mhO9obbBZ8/pniLuN0IIT85I3k0j 4+4RMm18KCn0Q== Date: Mon, 22 Jan 2024 09:41:40 +0200 From: Mike Rapoport To: Shijie Huang Cc: Yury Norov , Huang Shijie , gregkh@linuxfoundation.org, patches@amperecomputing.com, rafael@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, kuba@kernel.org, vschneid@redhat.com, mingo@kernel.org, akpm@linux-foundation.org, vbabka@suse.cz, tglx@linutronix.de, jpoimboe@kernel.org, ndesaulniers@google.com, mikelley@microsoft.com, mhiramat@kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, chenhuacai@kernel.org, jiaxun.yang@flygoat.com, linux-mips@vger.kernel.org, cl@os.amperecomputing.com Subject: Re: [PATCH] NUMA: Early use of cpu_to_node() returns 0 instead of the correct node id Message-ID: References: <20240119033227.14113-1-shijie@os.amperecomputing.com> <1cd078fd-c345-4d85-a92f-04c806c20efa@amperemail.onmicrosoft.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240121_234208_547393_CBC0D99D X-CRM114-Status: GOOD ( 18.64 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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Mon, 22 Jan 2024 18:42:10 +1100 (AEDT) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id D8F62610E7; Mon, 22 Jan 2024 07:42:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2B284C43394; Mon, 22 Jan 2024 07:41:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705909326; bh=6q+Ae298LK6Fwx9w1Hxqg+/TcqF4+MMHBmWb7Tw8+hU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jOnqDMRdvXuWTje7hxQN2dCLE7PzYUq8rAYWennGmg2eWAJlF8wYxF7WITOD93XyX kOi7HC3t/JBdyraClA4q5IQ6eCe0QP9DQEOOLu5rJzGGtUakerutvskNDSebyStAJZ z+mnBJqfh9Fcq+5rh+Kc2KPiYn9xLCRpmCpxOFhvwp4xLOdS0I9/a1r1ZusQ+JEtay eerJbS9dnoFfr2YnDqeIifjrZ8RFwgs3XLP/I8Wfw7PBHR0aHCQTC5FxayDUKgCqE/ I+Nux9qFYloyZL8LPJSk6tchB/m6C22f9IUgs1mhO9obbBZ8/pniLuN0IIT85I3k0j 4+4RMm18KCn0Q== Date: Mon, 22 Jan 2024 09:41:40 +0200 From: Mike Rapoport To: Shijie Huang Subject: Re: [PATCH] NUMA: Early use of cpu_to_node() returns 0 instead of the correct node id Message-ID: References: <20240119033227.14113-1-shijie@os.amperecomputing.com> <1cd078fd-c345-4d85-a92f-04c806c20efa@amperemail.onmicrosoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, rafael@kernel.org, catalin.marinas@arm.com, jiaxun.yang@flygoat.com, mikelley@microsoft.com, linux-riscv@lists.infradead.org, will@kernel.org, mingo@kernel.org, vschneid@redhat.com, arnd@arndb.de, chenhuacai@kernel.org, cl@os.amperecomputing.com, linux-arm-kernel@lists.infradead.org, kuba@kernel.org, patches@amperecomputing.com, linux-mips@vger.kernel.org, aou@eecs.berkeley.edu, Yury Norov , paul.walmsley@sifive.com, tglx@linutronix.de, jpoimboe@kernel.org, vbabka@suse.cz, Huang Shijie , gregkh@linuxfoundation.org, ndesaulniers@google.com, linux-kernel@vger.kernel.org, palmer@dabbelt.com, mhiramat@kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, Jan 19, 2024 at 04:50:53PM +0800, Shijie Huang wrote: > > 在 2024/1/19 16:42, Mike Rapoport 写道: > > Is there a fundamental reason to have early_cpu_to_node() at all? > > The early_cpu_to_node does not work on some ARCHs (which support the NUMA), > such as  SPARC, MIPS and S390. My question was why we need early_cpu_to_node() at all and why can't we use cpu_to_node() early on arches that do have it. > Thanks > > Huang Shijie > > > It seems that all the mappings are known by the end of setup_arch() and the > > initialization of numa_node can be moved earlier. > > > > I would also initialize the numa_node with NUMA_NO_NODE at declaration, > > > > so that if someone calls cpu_to_node() before the variable is properly > > > > initialized at runtime, he'll get NO_NODE, which is obviously an error. > > > Even we set the numa_node with NUMA_NO_NODE, it does not always produce > > > error. > > > > > > Please see the alloc_pages_node(). > > > > > > > > > Thanks > > > > > > Huang Shijie > > > -- Sincerely yours, Mike. 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charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gRnJpLCBKYW4gMTksIDIwMjQgYXQgMDQ6NTA6NTNQTSArMDgwMCwgU2hpamllIEh1YW5nIHdy b3RlOgo+IAo+IOWcqCAyMDI0LzEvMTkgMTY6NDIsIE1pa2UgUmFwb3BvcnQg5YaZ6YGTOgo+ID4g SXMgdGhlcmUgYSBmdW5kYW1lbnRhbCByZWFzb24gdG8gaGF2ZSBlYXJseV9jcHVfdG9fbm9kZSgp IGF0IGFsbD8KPiAKPiBUaGUgZWFybHlfY3B1X3RvX25vZGUgZG9lcyBub3Qgd29yayBvbiBzb21l IEFSQ0hzICh3aGljaCBzdXBwb3J0IHRoZSBOVU1BKSwKPiBzdWNoIGFzwqAgU1BBUkMsIE1JUFMg YW5kIFMzOTAuCgpNeSBxdWVzdGlvbiB3YXMgd2h5IHdlIG5lZWQgZWFybHlfY3B1X3RvX25vZGUo KSBhdCBhbGwgYW5kIHdoeSBjYW4ndCB3ZSB1c2UKY3B1X3RvX25vZGUoKSBlYXJseSBvbiBhcmNo ZXMgdGhhdCBkbyBoYXZlIGl0LgogCj4gVGhhbmtzCj4gCj4gSHVhbmcgU2hpamllCj4gCj4gPiBJ dCBzZWVtcyB0aGF0IGFsbCB0aGUgbWFwcGluZ3MgYXJlIGtub3duIGJ5IHRoZSBlbmQgb2Ygc2V0 dXBfYXJjaCgpIGFuZCB0aGUKPiA+IGluaXRpYWxpemF0aW9uIG9mIG51bWFfbm9kZSBjYW4gYmUg bW92ZWQgZWFybGllci4KPiA+ID4gPiBJIHdvdWxkIGFsc28gaW5pdGlhbGl6ZSB0aGUgbnVtYV9u b2RlIHdpdGggTlVNQV9OT19OT0RFIGF0IGRlY2xhcmF0aW9uLAo+ID4gPiA+IHNvIHRoYXQgaWYg c29tZW9uZSBjYWxscyBjcHVfdG9fbm9kZSgpIGJlZm9yZSB0aGUgdmFyaWFibGUgaXMgcHJvcGVy bHkKPiA+ID4gPiBpbml0aWFsaXplZCBhdCBydW50aW1lLCBoZSdsbCBnZXQgTk9fTk9ERSwgd2hp Y2ggaXMgb2J2aW91c2x5IGFuIGVycm9yLgo+ID4gPiBFdmVuIHdlIHNldCB0aGUgbnVtYV9ub2Rl IHdpdGggTlVNQV9OT19OT0RFLCBpdCBkb2VzIG5vdCBhbHdheXMgcHJvZHVjZQo+ID4gPiBlcnJv ci4KPiA+ID4gCj4gPiA+IFBsZWFzZSBzZWUgdGhlIGFsbG9jX3BhZ2VzX25vZGUoKS4KPiA+ID4g Cj4gPiA+IAo+ID4gPiBUaGFua3MKPiA+ID4gCj4gPiA+IEh1YW5nIFNoaWppZQo+ID4gPiAKCi0t IApTaW5jZXJlbHkgeW91cnMsCk1pa2UuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0t a2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFp bG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==