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McKenney" To: Sebastian Andrzej Siewior Cc: Stefan Wahren , Marcelo Tosatti , Andrew Morton , Nicolas Saenz Julienne , Borislav Petkov , Minchan Kim , Matthew Wilcox , Mel Gorman , Juri Lelli , Thomas Gleixner , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linux ARM , Phil Elwell , regressions@lists.linux.dev Subject: Re: vchiq: Performance regression since 5.18-rc1 Message-ID: <20220525150233.GX1790663@paulmck-ThinkPad-P17-Gen-1> Reply-To: paulmck@kernel.org References: <77d6d498-7dd9-03eb-60f2-d7e682bb1b20@i2se.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-7.8 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 25, 2022 at 04:26:27PM +0200, Sebastian Andrzej Siewior wrote: > On 2022-05-25 16:07:47 [+0200], Stefan Wahren wrote: > > this was the same as Paul send. I think i need more time for investigation, > > maybe there is an issue with the application. > > I haven't seen Paul referring to *that* patch. He pointed to some fs/ > related changes. True! Both patches changed from a synchronize_rcu() to a synchronize_rcu_expedited(), but different instances of synchronize_rcu(). Thanx, Paul