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Biederman" To: Sebastian Andrzej Siewior Cc: Peter Zijlstra , rjw@rjwysocki.net, oleg@redhat.com, mingo@kernel.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, mgorman@suse.de, Will Deacon , linux-kernel@vger.kernel.org, tj@kernel.org, linux-pm@vger.kernel.org References: <20220421150248.667412396@infradead.org> Date: Fri, 22 Apr 2022 14:15:35 -0500 In-Reply-To: (Sebastian Andrzej Siewior's message of "Fri, 22 Apr 2022 19:43:18 +0200") Message-ID: <878rrxnd48.fsf@email.froward.int.ebiederm.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1nhyru-001u6V-Vt;;;mid=<878rrxnd48.fsf@email.froward.int.ebiederm.org>;;;hst=in02.mta.xmission.com;;;ip=68.227.174.4;;;frm=ebiederm@xmission.com;;;spf=softfail X-XM-AID: U2FsdGVkX19hvqqRkMVEC3l3uQe4MMAWSxUUPffs0mA= X-SA-Exim-Connect-IP: 68.227.174.4 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RDNS_NONE, SPF_HELO_NONE autolearn=no autolearn_force=no version=3.4.6 X-Spam-DCC: XMission; sa05 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: **;Sebastian Andrzej Siewior X-Spam-Relay-Country: X-Spam-Timing: total 521 ms - load_scoreonly_sql: 0.16 (0.0%), signal_user_changed: 11 (2.2%), b_tie_ro: 9 (1.8%), parse: 1.02 (0.2%), extract_message_metadata: 10 (1.9%), get_uri_detail_list: 0.66 (0.1%), tests_pri_-1000: 8 (1.4%), tests_pri_-950: 1.17 (0.2%), tests_pri_-900: 0.86 (0.2%), tests_pri_-90: 163 (31.3%), check_bayes: 161 (30.8%), b_tokenize: 4.4 (0.8%), b_tok_get_all: 63 (12.1%), b_comp_prob: 1.66 (0.3%), b_tok_touch_all: 87 (16.7%), b_finish: 1.45 (0.3%), tests_pri_0: 200 (38.3%), check_dkim_signature: 0.92 (0.2%), check_dkim_adsp: 3.4 (0.6%), poll_dns_idle: 93 (17.8%), tests_pri_10: 4.0 (0.8%), tests_pri_500: 119 (22.8%), rewrite_mail: 0.00 (0.0%) Subject: Re: [PATCH v2 0/5] ptrace-vs-PREEMPT_RT and freezer rewrite X-SA-Exim-Version: 4.2.1 (built Sat, 08 Feb 2020 21:53:50 +0000) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.com) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sebastian Andrzej Siewior writes: > On 2022-04-21 17:02:48 [+0200], Peter Zijlstra wrote: >> Find here a new posting of the ptrace and freezer patches :-) >> >> The majority of the changes are in patch 2, which with much feedback from Oleg >> and Eric has changed lots. >> >> I'm hoping we're converging on something agreeable. > > I tested this under RT (had to remove the preempt-disable section in > ptrace_stop()) with ssdd [0]. It forks a few tasks and then > PTRACE_SINGLESTEPs them for a few iterations. Out of curiosity why did you need to remove the preempt_disable section on PREEMPT_RT? It should have lasted for just a moment until schedule was called. Eric