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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769481913; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=z3nsZCHloDjEFT63wrJPNHkkbtPu1NO+p+ag9oOS/4s=; b=TLpEx4waOFjLCEtMyKYbSF7YnojCZxnLYrXP50WDo8bqSLwGFx/HZiKKsCkbSGJDWbHBeu x9hp2U81qFGa0LwaEVL+Y6HlGMaqxJCmDlfoIAvobc8Box8efuEi1XBeRL8orFcrYoTtr5 qO+DZmBfWe2+lrYYtWn3/FpwVcs1lgQ= From: Roman Gushchin To: bpf@vger.kernel.org Cc: Michal Hocko , Alexei Starovoitov , Matt Bobrowski , Shakeel Butt , JP Kobryn , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Suren Baghdasaryan , Johannes Weiner , Andrew Morton , Roman Gushchin Subject: [PATCH bpf-next v3 13/17] sched: psi: add a trace point to psi_avgs_work() Date: Mon, 26 Jan 2026 18:44:16 -0800 Message-ID: <20260127024421.494929-14-roman.gushchin@linux.dev> In-Reply-To: <20260127024421.494929-1-roman.gushchin@linux.dev> References: <20260127024421.494929-1-roman.gushchin@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: ABE921A0003 X-Stat-Signature: cdpdyw4gwm66knzhufq6xso5hpd8mspj X-Rspam-User: X-HE-Tag: 1769481914-336519 X-HE-Meta: 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 HusLrQfa WvfldVVBYKpqTgO7kMo1xl2zVM8lw0IJfqHxinAtbTAyjXiRqIFtgC+NFqy27xSmGPtdXPrZxXOWofyaRgu0/aGlR9PVzRyC6S3Qg+z79G3NdI+5QBBe0dSXQslVpprVihqDe858W+fts1/XZKPvHM4obodXkThWzTNsKzbl2yS2qHcBTzhHB5oYL7VdtTf++xDmSH+paACDmGLTNQKSpQRHf+Oy4wjFWS5fdiFwr9of5eyVQ9g1NaTi58vp0myMUxkChS7rf2iuz27905ivxUxBPOg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a trace point to psi_avgs_work(). It can be used to attach a bpf handler which can monitor PSI values system-wide or for specific cgroup(s) and potentially perform some actions, e.g. declare an OOM. Signed-off-by: Roman Gushchin --- include/trace/events/psi.h | 27 +++++++++++++++++++++++++++ kernel/sched/psi.c | 6 ++++++ 2 files changed, 33 insertions(+) create mode 100644 include/trace/events/psi.h diff --git a/include/trace/events/psi.h b/include/trace/events/psi.h new file mode 100644 index 000000000000..57c46de18616 --- /dev/null +++ b/include/trace/events/psi.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM psi + +#if !defined(_TRACE_PSI_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_PSI_H + +#include + +TRACE_EVENT(psi_avgs_work, + TP_PROTO(struct psi_group *group), + TP_ARGS(group), + TP_STRUCT__entry( + __field(struct psi_group *, group) + ), + + TP_fast_assign( + __entry->group = group; + ), + + TP_printk("group=%p", __entry->group) +); + +#endif /* _TRACE_PSI_H */ + +/* This part must be outside protection */ +#include diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index 59fdb7ebbf22..72757ba2ed96 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -141,6 +141,10 @@ #include #include "sched.h" +#define CREATE_TRACE_POINTS +#include +#undef CREATE_TRACE_POINTS + static int psi_bug __read_mostly; DEFINE_STATIC_KEY_FALSE(psi_disabled); @@ -607,6 +611,8 @@ static void psi_avgs_work(struct work_struct *work) group->avg_next_update - now) + 1); } + trace_psi_avgs_work(group); + mutex_unlock(&group->avgs_lock); } -- 2.52.0