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Mon, 31 May 2021 11:23:07 +0000 Received: by kubenode568.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 22aa3df4465b3e865aa6fda3101562db; Mon, 31 May 2021 11:23:05 +0000 (UTC) Content-Type: text/plain; charset=us-ascii List-Id: Porting FreeBSD to the PowerPC List-Archive: https://lists.freebsd.org/archives/freebsd-ppc List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-ppc@freebsd.org X-BeenThere: freebsd-ppc@freebsd.org Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.80.0.2.43\)) Subject: Re: Is powerpc64 atomic_load_acq_##TYPE omitting isync believed correct? In-Reply-To: <07D39D7F-711B-4FF3-AA33-AB691C231FA4@yahoo.com> Date: Mon, 31 May 2021 04:23:04 -0700 Cc: FreeBSD Hackers Content-Transfer-Encoding: 7bit Message-Id: <944F3A86-8EAA-42F5-A0BC-FF2BA8E480DA@yahoo.com> References: <07D39D7F-711B-4FF3-AA33-AB691C231FA4@yahoo.com> To: FreeBSD PowerPC ML X-Mailer: Apple Mail (2.3654.80.0.2.43) X-Rspamd-Queue-Id: 4FttFT1yKMz4cFN X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=yahoo.com header.s=s2048 header.b=Oq5f83i9; dmarc=pass (policy=reject) header.from=yahoo.com; spf=pass (mx1.freebsd.org: domain of marklmi@yahoo.com designates 98.137.68.147 as permitted sender) smtp.mailfrom=marklmi@yahoo.com X-Spamd-Result: default: False [-2.50 / 15.00]; FREEMAIL_FROM(0.00)[yahoo.com]; MV_CASE(0.50)[]; R_SPF_ALLOW(-0.20)[+ptr:yahoo.com]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[yahoo.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[yahoo.com,reject]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_LAST(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[yahoo.com]; ASN(0.00)[asn:36647, ipnet:98.137.64.0/20, country:US]; RBL_DBL_DONT_QUERY_IPS(0.00)[98.137.68.147:from]; DWL_DNSWL_NONE(0.00)[yahoo.com:dkim]; SUBJECT_ENDS_QUESTION(1.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[yahoo.com:s=s2048]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; SPAMHAUS_ZRD(0.00)[98.137.68.147:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[98.137.68.147:from]; RWL_MAILSPIKE_POSSIBLE(0.00)[98.137.68.147:from]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-ppc] Reply-To: marklmi@yahoo.com From: Mark Millard via freebsd-hackers X-Original-From: Mark Millard X-ThisMailContainsUnwantedMimeParts: N On 2021-May-29, at 23:04, Mark Millard wrote: > In the code from /usr/include/machine/atomic.h for powerpc64 > and powerpc there is: > > #define ATOMIC_STORE_LOAD(TYPE) \ > static __inline u_##TYPE \ > atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ > { \ > u_##TYPE v; \ > \ > v = *p; \ > powerpc_lwsync(); \ > return (v); \ > } \ > \ > static __inline void \ > atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) \ > { \ > \ > powerpc_lwsync(); \ > *p = v; \ > } > > This code sequence does not involve isync: > > #define __ATOMIC_ACQ() __asm __volatile("isync" : : : "memory") > > What justifies this? All the reference material I've > found for C++/C11 semantics agrees with: > > https://www.cl.cam.ac.uk/~pes20/cpp/cpp0xmappings.html > > that shows (organized here to compare Relaxed vs. > Acquire and Release): > > powerpc Load Relaxed vs. Acquire: ld vs. ld;cmp;bc;isync > powerpc Fence: Acquire: lwsync > powerpc Store Relaxed vs. Release: st vs. "Fence: Release";st > powerpc Fence: Release: lwsync > > lwsync does not order prior stores vs. later loads, isync does > (and more in some respects). That likely (partially) explains > why load-acquire does not use just an acquire-fence in such > materials. > > Is this a problem for being correct for "synchronizes with" in > "man atomic"? For the acquire operation reading the value > written by the release operation: > > QUOTE > . . . the effects of all > prior stores by the releasing thread must become visible to subsequent > loads by the acquiring thread > END QUOTE > > It seems that some later loads could be moved by the hardware > to be too early relative to various such prior stores (as seen > in the load-acquire thread): no constraint is placed for such > relationships by the atomic_load_acq_##TYPE as far as I can see. > > > (I got into this by finding some code that uses an > atomic_store_rel_##TYPE without any matching use of > atomic_load_acq_##TYPE or atomic_thread_fence_acq or other such, > so far as I found. But, looking around to see if I could find a > justification for such code, generated more questions, such as > in this note.) Never mind. I figured out my significant confusion in interpretation. (Net result: lwsync is more than sufficient.) === Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar) From nobody Tue Jun 1 03:22:56 2021 X-Original-To: ppc@freebsd.org Received: from mlmmj.nyi.freebsd.org (unknown [127.0.1.24]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 2CD75E70347 for ; Tue, 1 Jun 2021 03:22:56 +0000 (UTC) (envelope-from freebsd-ppc+bounces-help@FreeBSD.org) Subject: =?utf-8?q?Unable_to_unsubscribe_from_freebsd-ppc=40FreeBSD.org?= From: freebsd-ppc+help@FreeBSD.org To: ppc@freebsd.org Message-ID: <1622517776-19770-mlmmj-0bd63ef5@FreeBSD.org> Date: Tue, 01 Jun 2021 03:22:56 +0000 List-Id: Porting FreeBSD to the PowerPC List-Archive: https://lists.freebsd.org/archives/freebsd-ppc List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-ppc@freebsd.org X-BeenThere: freebsd-ppc@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-ThisMailContainsUnwantedMimeParts: N Hi, this is the Mlmmj program managing the mailing list. 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In-Reply-To: Date: Wed, 2 Jun 2021 22:27:14 -0700 Cc: "freebsd-ppc@freebsd.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <9FF7E0E7-E666-443C-8CA7-C031EBE60BF6@yahoo.com> <200faa1c-6153-1e2f-d3a1-f76eaf83284a@gmail.com> <050d9b25-772f-4dc8-d92d-d6cd70f0c376@gmail.com> To: Jason Bacon X-Mailer: Apple Mail (2.3654.80.0.2.43) X-Rspamd-Queue-Id: 4FwZCb3x42z3w2t X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=pass header.d=yahoo.com header.s=s2048 header.b=nF2dPVAu; dmarc=pass (policy=reject) header.from=yahoo.com; spf=pass (mx1.freebsd.org: domain of marklmi@yahoo.com designates 98.137.68.146 as permitted sender) smtp.mailfrom=marklmi@yahoo.com X-Spamd-Result: default: False [-0.50 / 15.00]; TO_DN_EQ_ADDR_SOME(0.00)[]; TO_DN_SOME(0.00)[]; MV_CASE(0.50)[]; FREEMAIL_FROM(0.00)[yahoo.com]; R_SPF_ALLOW(-0.20)[+ptr:yahoo.com]; DKIM_TRACE(0.00)[yahoo.com:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[yahoo.com,reject]; FREEMAIL_TO(0.00)[gmail.com]; FROM_EQ_ENVFROM(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[yahoo.com]; MID_RHS_MATCH_FROM(0.00)[]; RBL_DBL_DONT_QUERY_IPS(0.00)[98.137.68.146:from]; ASN(0.00)[asn:36647, ipnet:98.137.64.0/20, country:US]; RCVD_TLS_LAST(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[yahoo.com:s=s2048]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; FROM_HAS_DN(0.00)[]; DWL_DNSWL_NONE(0.00)[yahoo.com:dkim]; NEURAL_SPAM_SHORT(1.00)[1.000]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; SPAMHAUS_ZRD(0.00)[98.137.68.146:from:127.0.2.255]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_IN_DNSWL_NONE(0.00)[98.137.68.146:from]; RWL_MAILSPIKE_POSSIBLE(0.00)[98.137.68.146:from]; RCVD_COUNT_TWO(0.00)[2]; MAILMAN_DEST(0.00)[freebsd-ppc] Reply-To: marklmi@yahoo.com From: Mark Millard via freebsd-ppc X-Original-From: Mark Millard X-ThisMailContainsUnwantedMimeParts: N =46rom am recent exchange asking why amd64 had not updated some packages, Kevin Oberman wrote: > I have previously confirmed with one of the cluster admins that a = build of that size can take over 4 days to distribute to all mirrors and = no mirror starts distributing updated packages until all mirrors are = either in sync of have been pulled from the list of active mirrors if = there is a problem with one. It's a really huge amount of data and the = places that havd mirrors on slow links are the ones that rally need to = load packages form a fairly local mirror. =3D=3D=3D Mark Millard marklmi at yahoo.com ( dsl-only.net went away in early 2018-Mar)