From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Gleixner Date: Fri, 13 Nov 2020 14:02:07 +0000 Subject: [patch 00/19] softirq: Cleanups and RT awareness Message-Id: <20201113140207.499353218@linutronix.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: LKML Cc: Marc Zyngier , Rich Felker , Catalin Marinas , Paul McKenney , Arnd Bergmann , linux-sh@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Frederic Weisbecker , Valentin Schneider , Jeff Dike , Russell King , Yoshinori Sato , "James E.J. Bottomley" , linux-parisc@vger.kernel.org, Helge Deller , linux-um@lists.infradead.org, Will Deacon , Sebastian Andrzej Siewior , linux-arm-kernel@lists.infradead.org, Anton Ivanov UlQgcnVucyBzb2Z0aXJxIHByb2Nlc3NpbmcgYWx3YXlzIGluIHRocmVhZCBjb250ZXh0IGFuZCBp dCByZXF1aXJlcyB0aGF0CmJvdGggdGhlIHNvZnRpcnEgZXhlY3V0aW9uIGFuZCB0aGUgQkggZGlz YWJsZWQgc2VjdGlvbnMgYXJlIHByZWVtcHRpYmxlLgoKVGhpcyBpcyBhY2hpZXZlZCBieSBzZXJp YWxpemF0aW9uIHRocm91Z2ggcGVyIENQVSBsb2NhbCBsb2NrcyBhbmQKc3Vic3RpdHV0aW5nIGEg ZmV3IHBhcnRzIG9mIHRoZSBleGlzdGluZyBzb2Z0aXJxIHByb2Nlc3NpbmcgY29kZSB3aXRoCmhl bHBlciBmdW5jdGlvbnMuCgpUaGUgZm9sbG93aW5nIHNlcmllcyBoYXMgdHdvIHBhcnRzOgoKICAg IDEpIENsZWFudXAgaXJxX2NwdXN0YXRzIGFuZCBjb25zb2xpZGF0aW9uIG9mIHRoZSBwcmVlbXB0 IGNvdW50IG1hemUKICAgICAgIHNvIHNvZnRpcnFfY291bnQoKSBhbmQgcmVsYXRlZCBwYXJ0cyBj YW4gYmUgc3Vic3RpdHV0ZWQgZm9yIFJUCgogICAgMikgVGhlIGFjdHVhbCBjb3JlIGltcGxlbWVu dGF0aW9uIGluY2x1ZGluZyB0aGUgcmVxdWlyZWQgZml4dXBzIGZvcgogICAgICAgTk9IWiwgUkNV IGFuZCB0YXNrbGV0cy4KClRoZSBzZXJpZXMgaXMgYWxzbyBhdmFpbGFibGUgZnJvbSBnaXQ6Cgog IGdpdDovL2dpdC5rZXJuZWwub3JnL3B1Yi9zY20vbGludXgva2VybmVsL2dpdC90Z2x4L2RldmVs LmdpdCBzb2Z0aXJxCgpUaGUgUlQgdmFyaWFudCBoYXMgc3VjZXNzZnVsbHkgYmVlbiB0ZXN0ZWQg aW4gdGhlIGN1cnJlbnQgNS4xMC1ydApwYXRjaGVzLiBGb3Igbm9uLVJUIGtlcm5lbHMgdGhlcmUg aXMgbm8gZnVuY3Rpb25hbCBjaGFuZ2UuCgpUaGFua3MsCgoJdGdseAotLS0KIGIvYXJjaC9hcm0v aW5jbHVkZS9hc20vaGFyZGlycS5oICAgIHwgICAxMSAKIGIvYXJjaC9hcm0vaW5jbHVkZS9hc20v aXJxLmggICAgICAgIHwgICAgMiAKIGIvYXJjaC9hcm02NC9pbmNsdWRlL2FzbS9oYXJkaXJxLmgg IHwgICAgNyAKIGIvYXJjaC9wYXJpc2MvaW5jbHVkZS9hc20vaGFyZGlycS5oIHwgICAgMSAKIGIv YXJjaC9zaC9pbmNsdWRlL2FzbS9oYXJkaXJxLmggICAgIHwgICAxNCAtCiBiL2FyY2gvc2gva2Vy bmVsL2lycS5jICAgICAgICAgICAgICB8ICAgIDIgCiBiL2FyY2gvc2gva2VybmVsL3RyYXBzLmMg ICAgICAgICAgICB8ICAgIDIgCiBiL2FyY2gvdW0vaW5jbHVkZS9hc20vaGFyZGlycS5oICAgICB8 ICAgMTcgLQogYi9pbmNsdWRlL2FzbS1nZW5lcmljL2hhcmRpcnEuaCAgICAgfCAgICA2IAogYi9p bmNsdWRlL2xpbnV4L2JvdHRvbV9oYWxmLmggICAgICAgfCAgICA4IAogYi9pbmNsdWRlL2xpbnV4 L2hhcmRpcnEuaCAgICAgICAgICAgfCAgICAxIAogYi9pbmNsdWRlL2xpbnV4L2ludGVycnVwdC5o ICAgICAgICAgfCAgIDEzIC0KIGIvaW5jbHVkZS9saW51eC9wcmVlbXB0LmggICAgICAgICAgIHwg ICAzNiArLS0KIGIvaW5jbHVkZS9saW51eC9yY3VwZGF0ZS5oICAgICAgICAgIHwgICAgMyAKIGIv aW5jbHVkZS9saW51eC9zY2hlZC5oICAgICAgICAgICAgIHwgICAgMyAKIGIva2VybmVsL3NvZnRp cnEuYyAgICAgICAgICAgICAgICAgIHwgIDQxMiArKysrKysrKysrKysrKysrKysrKysrKysrKysr KystLS0tLS0KIGIva2VybmVsL3RpbWUvdGljay1zY2hlZC5jICAgICAgICAgIHwgICAgMiAKIGlu Y2x1ZGUvbGludXgvaXJxX2NwdXN0YXQuaCAgICAgICAgIHwgICAyOCAtLQogMTggZmlsZXMgY2hh bmdlZCwgNDA1IGluc2VydGlvbnMoKyksIDE2MyBkZWxldGlvbnMoLSkKCgoKCgoK From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DEBD6C388F7 for ; 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Bottomley" , Helge Deller , linux-parisc@vger.kernel.org, Yoshinori Sato , Rich Felker , linux-sh@vger.kernel.org, Jeff Dike , Richard Weinberger , Anton Ivanov , linux-um@lists.infradead.org, Russell King , Marc Zyngier , Valentin Schneider , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon Subject: [patch 00/19] softirq: Cleanups and RT awareness MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org UlQgcnVucyBzb2Z0aXJxIHByb2Nlc3NpbmcgYWx3YXlzIGluIHRocmVhZCBjb250ZXh0IGFuZCBp dCByZXF1aXJlcyB0aGF0CmJvdGggdGhlIHNvZnRpcnEgZXhlY3V0aW9uIGFuZCB0aGUgQkggZGlz YWJsZWQgc2VjdGlvbnMgYXJlIHByZWVtcHRpYmxlLgoKVGhpcyBpcyBhY2hpZXZlZCBieSBzZXJp YWxpemF0aW9uIHRocm91Z2ggcGVyIENQVSBsb2NhbCBsb2NrcyBhbmQKc3Vic3RpdHV0aW5nIGEg ZmV3IHBhcnRzIG9mIHRoZSBleGlzdGluZyBzb2Z0aXJxIHByb2Nlc3NpbmcgY29kZSB3aXRoCmhl bHBlciBmdW5jdGlvbnMuCgpUaGUgZm9sbG93aW5nIHNlcmllcyBoYXMgdHdvIHBhcnRzOgoKICAg IDEpIENsZWFudXAgaXJxX2NwdXN0YXRzIGFuZCBjb25zb2xpZGF0aW9uIG9mIHRoZSBwcmVlbXB0 IGNvdW50IG1hemUKICAgICAgIHNvIHNvZnRpcnFfY291bnQoKSBhbmQgcmVsYXRlZCBwYXJ0cyBj YW4gYmUgc3Vic3RpdHV0ZWQgZm9yIFJUCgogICAgMikgVGhlIGFjdHVhbCBjb3JlIGltcGxlbWVu dGF0aW9uIGluY2x1ZGluZyB0aGUgcmVxdWlyZWQgZml4dXBzIGZvcgogICAgICAgTk9IWiwgUkNV IGFuZCB0YXNrbGV0cy4KClRoZSBzZXJpZXMgaXMgYWxzbyBhdmFpbGFibGUgZnJvbSBnaXQ6Cgog IGdpdDovL2dpdC5rZXJuZWwub3JnL3B1Yi9zY20vbGludXgva2VybmVsL2dpdC90Z2x4L2RldmVs LmdpdCBzb2Z0aXJxCgpUaGUgUlQgdmFyaWFudCBoYXMgc3VjZXNzZnVsbHkgYmVlbiB0ZXN0ZWQg aW4gdGhlIGN1cnJlbnQgNS4xMC1ydApwYXRjaGVzLiBGb3Igbm9uLVJUIGtlcm5lbHMgdGhlcmUg aXMgbm8gZnVuY3Rpb25hbCBjaGFuZ2UuCgpUaGFua3MsCgoJdGdseAotLS0KIGIvYXJjaC9hcm0v aW5jbHVkZS9hc20vaGFyZGlycS5oICAgIHwgICAxMSAKIGIvYXJjaC9hcm0vaW5jbHVkZS9hc20v aXJxLmggICAgICAgIHwgICAgMiAKIGIvYXJjaC9hcm02NC9pbmNsdWRlL2FzbS9oYXJkaXJxLmgg IHwgICAgNyAKIGIvYXJjaC9wYXJpc2MvaW5jbHVkZS9hc20vaGFyZGlycS5oIHwgICAgMSAKIGIv YXJjaC9zaC9pbmNsdWRlL2FzbS9oYXJkaXJxLmggICAgIHwgICAxNCAtCiBiL2FyY2gvc2gva2Vy bmVsL2lycS5jICAgICAgICAgICAgICB8ICAgIDIgCiBiL2FyY2gvc2gva2VybmVsL3RyYXBzLmMg ICAgICAgICAgICB8ICAgIDIgCiBiL2FyY2gvdW0vaW5jbHVkZS9hc20vaGFyZGlycS5oICAgICB8 ICAgMTcgLQogYi9pbmNsdWRlL2FzbS1nZW5lcmljL2hhcmRpcnEuaCAgICAgfCAgICA2IAogYi9p bmNsdWRlL2xpbnV4L2JvdHRvbV9oYWxmLmggICAgICAgfCAgICA4IAogYi9pbmNsdWRlL2xpbnV4 L2hhcmRpcnEuaCAgICAgICAgICAgfCAgICAxIAogYi9pbmNsdWRlL2xpbnV4L2ludGVycnVwdC5o ICAgICAgICAgfCAgIDEzIC0KIGIvaW5jbHVkZS9saW51eC9wcmVlbXB0LmggICAgICAgICAgIHwg ICAzNiArLS0KIGIvaW5jbHVkZS9saW51eC9yY3VwZGF0ZS5oICAgICAgICAgIHwgICAgMyAKIGIv aW5jbHVkZS9saW51eC9zY2hlZC5oICAgICAgICAgICAgIHwgICAgMyAKIGIva2VybmVsL3NvZnRp cnEuYyAgICAgICAgICAgICAgICAgIHwgIDQxMiArKysrKysrKysrKysrKysrKysrKysrKysrKysr KystLS0tLS0KIGIva2VybmVsL3RpbWUvdGljay1zY2hlZC5jICAgICAgICAgIHwgICAgMiAKIGlu Y2x1ZGUvbGludXgvaXJxX2NwdXN0YXQuaCAgICAgICAgIHwgICAyOCAtLQogMTggZmlsZXMgY2hh bmdlZCwgNDA1IGluc2VydGlvbnMoKyksIDE2MyBkZWxldGlvbnMoLSkKCgoKCgoK From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 603D1C388F7 for ; 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bh=PPLSKX/xmwMFedV4IKRF5BuAJaVvtEPUqA8f9IDGXCY=; b=AtBmIxr4B4x8cNg20chnLUnH8GQLpcWJEzBvaxV/w167Qbq0G7oSGl8oTsx7v+PGYUbpun UEH3CJUGQMXh0FBQ== Date: Fri, 13 Nov 2020 15:02:07 +0100 From: Thomas Gleixner To: LKML Subject: [patch 00/19] softirq: Cleanups and RT awareness MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201113_092415_601165_2C7FBCCC X-CRM114-Status: UNSURE ( 8.89 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Marc Zyngier , Rich Felker , Catalin Marinas , Paul McKenney , Arnd Bergmann , linux-sh@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Frederic Weisbecker , Valentin Schneider , Jeff Dike , Russell King , Yoshinori Sato , "James E.J. Bottomley" , linux-parisc@vger.kernel.org, Helge Deller , linux-um@lists.infradead.org, Will Deacon , Sebastian Andrzej Siewior , linux-arm-kernel@lists.infradead.org, Anton Ivanov Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org RT runs softirq processing always in thread context and it requires that both the softirq execution and the BH disabled sections are preemptible. This is achieved by serialization through per CPU local locks and substituting a few parts of the existing softirq processing code with helper functions. The following series has two parts: 1) Cleanup irq_cpustats and consolidation of the preempt count maze so softirq_count() and related parts can be substituted for RT 2) The actual core implementation including the required fixups for NOHZ, RCU and tasklets. The series is also available from git: git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git softirq The RT variant has sucessfully been tested in the current 5.10-rt patches. For non-RT kernels there is no functional change. Thanks, tglx --- b/arch/arm/include/asm/hardirq.h | 11 b/arch/arm/include/asm/irq.h | 2 b/arch/arm64/include/asm/hardirq.h | 7 b/arch/parisc/include/asm/hardirq.h | 1 b/arch/sh/include/asm/hardirq.h | 14 - b/arch/sh/kernel/irq.c | 2 b/arch/sh/kernel/traps.c | 2 b/arch/um/include/asm/hardirq.h | 17 - b/include/asm-generic/hardirq.h | 6 b/include/linux/bottom_half.h | 8 b/include/linux/hardirq.h | 1 b/include/linux/interrupt.h | 13 - b/include/linux/preempt.h | 36 +-- b/include/linux/rcupdate.h | 3 b/include/linux/sched.h | 3 b/kernel/softirq.c | 412 ++++++++++++++++++++++++++++++------ b/kernel/time/tick-sched.c | 2 include/linux/irq_cpustat.h | 28 -- 18 files changed, 405 insertions(+), 163 deletions(-) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel