psi: Introduce ftrace events (76cf078d) · Commits · e / devices / android_kernel_fairphone_FP5

include/trace/events/psi.h

0 → 100644

+70 −0

Original line number	Diff line number	Diff line
		/* SPDX-License-Identifier: GPL-2.0-only */
		/*
		* Copyright (c) 2019, The Linux Foundation. All rights reserved.
		*/
		#undef TRACE_SYSTEM
		#define TRACE_SYSTEM psi

		#if !defined(_TRACE_PSI_H) \|\| defined(TRACE_HEADER_MULTI_READ)
		#define _TRACE_PSI_H

		#include <linux/types.h>
		#include <linux/tracepoint.h>
		#include <linux/psi_types.h>

		TRACE_EVENT(psi_window_vmstat,

		TP_PROTO(u64 memstall, const char *zone_name, u64 high,
		u64 free, u64 cma, u64 file),

		TP_ARGS(memstall, zone_name, high, free, cma, file),

		TP_STRUCT__entry(
		__field(u64, memstall)
		__string(name, zone_name)
		__field(u64, high)
		__field(u64, free)
		__field(u64, cma)
		__field(u64, file)
		),

		TP_fast_assign(
		__entry->memstall = memstall;
		__assign_str(name, zone_name);
		__entry->high = high;
		__entry->free = free;
		__entry->cma = cma;
		__entry->file = file;
		),

		TP_printk("%16s: Memstall: %#16llx High: %#8llx Free: %#8llx CMA: %#8llx File: %#8llx",
		__get_str(name), __entry->memstall, __entry->high,
		__entry->free, __entry->cma, __entry->file
		)
		);

		TRACE_EVENT(psi_event,

		TP_PROTO(enum psi_states state, u64 threshold),

		TP_ARGS(state, threshold),

		TP_STRUCT__entry(
		__field(enum psi_states, state)
		__field(u64, threshold)
		),

		TP_fast_assign(
		__entry->state = state;
		__entry->threshold = threshold;
		),

		TP_printk("State: %d Threshold: %#llx",
		__entry->state, __entry->threshold
		)
		);

		#endif

		/* This part must be outside protection */
		#include <trace/define_trace.h>

init/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -588,6 +588,16 @@ config PSI_DEFAULT_DISABLED

		Say N if unsure.

		config PSI_FTRACE
		bool "Insert debug hooks for PSI ftrace events"
		default n
		depends on PSI
		help
		If not set, PSI ftrace events will be disabled and
		will not incur any performance penalty.
		If set, PSI ftrace events may be
		enabled.

		endmenu # "CPU/Task time and stats accounting"

		config CPU_ISOLATION

kernel/sched/psi.c

+33 −0

Original line number	Diff line number	Diff line
		@@ -142,6 +142,9 @@
		#include <linux/psi.h>
		#include "sched.h"

		#define CREATE_TRACE_POINTS
		#include <trace/events/psi.h>

		static int psi_bug __read_mostly;

		DEFINE_STATIC_KEY_FALSE(psi_disabled);
		@@ -441,6 +444,33 @@ static void psi_avgs_work(struct work_struct *work)
		mutex_unlock(&group->avgs_lock);
		}

		#ifdef CONFIG_PSI_FTRACE
		static void trace_event_helper(struct psi_group *group)
		{
		struct zone *zone;
		unsigned long wmark;
		unsigned long free;
		unsigned long cma;
		unsigned long file;
		u64 memstall = group->total[PSI_POLL][PSI_MEM_SOME];

		for_each_populated_zone(zone) {
		wmark = zone->watermark[WMARK_HIGH];
		free = zone_page_state(zone, NR_FREE_PAGES);
		cma = zone_page_state(zone, NR_FREE_CMA_PAGES);
		file = zone_page_state(zone, NR_ZONE_ACTIVE_FILE) +
		zone_page_state(zone, NR_ZONE_INACTIVE_FILE);

		trace_psi_window_vmstat(
		memstall, zone->name, wmark, free, cma, file);
		}
		}
		#else
		static void trace_event_helper(struct psi_group *group)
		{
		}
		#endif /* CONFIG_PSI_FTRACE */

		/* Trigger tracking window manupulations */
		static void window_reset(struct psi_window *win, u64 now, u64 value,
		u64 prev_growth)
		@@ -533,6 +563,8 @@ static u64 update_triggers(struct psi_group *group, u64 now)
		if (now < t->last_event_time + t->win.size)
		continue;

		trace_psi_event(t->state, t->threshold);

		/* Generate an event */
		if (cmpxchg(&t->event, 0, 1) == 0)
		wake_up_interruptible(&t->event_wait);
		@@ -605,6 +637,7 @@ static void psi_poll_work(struct kthread_work *work)
		*/
		group->polling_until = now +
		group->poll_min_period * UPDATES_PER_WINDOW;
		trace_event_helper(group);
		}

		if (now > group->polling_until) {