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Sun, 03 May 2026 09:50:59 -0700 (PDT) Received: from localhost.localdomain ([114.231.84.174]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83707fab756sm1494277b3a.44.2026.05.03.09.50.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 May 2026 09:50:59 -0700 (PDT) From: Vernon Yang To: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, roman.gushchin@linux.dev, inwardvessel@gmail.com, shakeel.butt@linux.dev, ast@kernel.org, daniel@iogearbox.net, surenb@google.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, baohua@kernel.org, lance.yang@linux.dev, dev.jain@arm.com, Vernon Yang Subject: [PATCH 1/4] psi: add psi_group_flush_stats() function Date: Mon, 4 May 2026 00:50:21 +0800 Message-ID: <20260503165024.1526680-2-vernon2gm@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260503165024.1526680-1-vernon2gm@gmail.com> References: <20260503165024.1526680-1-vernon2gm@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Vernon Yang Add psi_group_flush_stats() function to prepare for the subsequent mthp_ext ebpf program. no function changes. Signed-off-by: Vernon Yang --- include/linux/psi.h | 1 + kernel/sched/psi.c | 34 ++++++++++++++++++++++++++-------- 2 files changed, 27 insertions(+), 8 deletions(-) diff --git a/include/linux/psi.h b/include/linux/psi.h index e0745873e3f2..7b4fd8190810 100644 --- a/include/linux/psi.h +++ b/include/linux/psi.h @@ -22,6 +22,7 @@ void psi_init(void); void psi_memstall_enter(unsigned long *flags); void psi_memstall_leave(unsigned long *flags); +void psi_group_flush_stats(struct psi_group *group); int psi_show(struct seq_file *s, struct psi_group *group, enum psi_res res); struct psi_trigger *psi_trigger_create(struct psi_group *group, char *buf, enum psi_res res, struct file *file, diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index d9c9d9480a45..76ffad90b0b5 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -1242,11 +1242,35 @@ void psi_cgroup_restart(struct psi_group *group) } #endif /* CONFIG_CGROUPS */ +/* + * __psi_group_flush_stats - flush the total stall time of a psi group + * @group: psi group to flush + */ +static void __psi_group_flush_stats(struct psi_group *group) +{ + u64 now; + + /* Update averages before reporting them */ + mutex_lock(&group->avgs_lock); + now = sched_clock(); + collect_percpu_times(group, PSI_AVGS, NULL); + if (now >= group->avg_next_update) + group->avg_next_update = update_averages(group, now); + mutex_unlock(&group->avgs_lock); +} + +void psi_group_flush_stats(struct psi_group *group) +{ + if (static_branch_likely(&psi_disabled)) + return; + + __psi_group_flush_stats(group); +} + int psi_show(struct seq_file *m, struct psi_group *group, enum psi_res res) { bool only_full = false; int full; - u64 now; if (static_branch_likely(&psi_disabled)) return -EOPNOTSUPP; @@ -1256,13 +1280,7 @@ int psi_show(struct seq_file *m, struct psi_group *group, enum psi_res res) return -EOPNOTSUPP; #endif - /* Update averages before reporting them */ - mutex_lock(&group->avgs_lock); - now = sched_clock(); - collect_percpu_times(group, PSI_AVGS, NULL); - if (now >= group->avg_next_update) - group->avg_next_update = update_averages(group, now); - mutex_unlock(&group->avgs_lock); + __psi_group_flush_stats(group); #ifdef CONFIG_IRQ_TIME_ACCOUNTING only_full = res == PSI_IRQ; -- 2.53.0