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Tue, 7 Nov 2023 21:58:59 +0000 From: Ankur Arora To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, peterz@infradead.org, torvalds@linux-foundation.org, paulmck@kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, willy@infradead.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, mingo@kernel.org, bristot@kernel.org, mathieu.desnoyers@efficios.com, geert@linux-m68k.org, glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com, mattst88@gmail.com, krypton@ulrich-teichert.org, rostedt@goodmis.org, David.Laight@ACULAB.COM, richard@nod.at, mjguzik@gmail.com, Ankur Arora Subject: [RFC PATCH 25/86] Revert "sched: Add /debug/sched_preempt" Date: Tue, 7 Nov 2023 13:57:11 -0800 Message-Id: <20231107215742.363031-26-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231107215742.363031-1-ankur.a.arora@oracle.com> References: <20231107215742.363031-1-ankur.a.arora@oracle.com> X-ClientProxiedBy: MW4P221CA0019.NAMP221.PROD.OUTLOOK.COM (2603:10b6:303:8b::24) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|BN0PR10MB5048:EE_ X-MS-Office365-Filtering-Correlation-Id: 30081449-50cf-4bcf-f75c-08dbdfdcbeb0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Tue, 07 Nov 2023 14:02:24 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781944399908711420 X-GMAIL-MSGID: 1781944399908711420 This reverts commit e59e10f8ef63d42fbb99776a5a112841e798b3b5. Signed-off-by: Ankur Arora --- kernel/sched/core.c | 137 +++----------------------------------------- 1 file changed, 9 insertions(+), 128 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 7ea22244c540..b8dacc7feb47 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6989,156 +6989,37 @@ EXPORT_STATIC_CALL(preempt_schedule_notrace); * preempt_schedule_notrace <- preempt_schedule_notrace * irqentry_exit_cond_resched <- irqentry_exit_cond_resched */ - -enum { - preempt_dynamic_none = 0, - preempt_dynamic_voluntary, - preempt_dynamic_full, -}; - -static int preempt_dynamic_mode = preempt_dynamic_full; - -static int sched_dynamic_mode(const char *str) +static int __init setup_preempt_mode(char *str) { - if (!strcmp(str, "none")) - return 0; - - if (!strcmp(str, "voluntary")) - return 1; - - if (!strcmp(str, "full")) - return 2; - - return -1; -} - -static void sched_dynamic_update(int mode) -{ - /* - * Avoid {NONE,VOLUNTARY} -> FULL transitions from ever ending up in - * the ZERO state, which is invalid. - */ - static_call_update(cond_resched, __cond_resched); - static_call_update(might_resched, __cond_resched); - static_call_update(preempt_schedule, __preempt_schedule_func); - static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func); - static_call_update(irqentry_exit_cond_resched, irqentry_exit_cond_resched); - - switch (mode) { - case preempt_dynamic_none: + if (!strcmp(str, "none")) { static_call_update(cond_resched, __cond_resched); static_call_update(might_resched, (typeof(&__cond_resched)) __static_call_return0); static_call_update(preempt_schedule, (typeof(&preempt_schedule)) NULL); static_call_update(preempt_schedule_notrace, (typeof(&preempt_schedule_notrace)) NULL); static_call_update(irqentry_exit_cond_resched, (typeof(&irqentry_exit_cond_resched)) NULL); - pr_info("Dynamic Preempt: none\n"); - break; - - case preempt_dynamic_voluntary: + pr_info("Dynamic Preempt: %s\n", str); + } else if (!strcmp(str, "voluntary")) { static_call_update(cond_resched, __cond_resched); static_call_update(might_resched, __cond_resched); static_call_update(preempt_schedule, (typeof(&preempt_schedule)) NULL); static_call_update(preempt_schedule_notrace, (typeof(&preempt_schedule_notrace)) NULL); static_call_update(irqentry_exit_cond_resched, (typeof(&irqentry_exit_cond_resched)) NULL); - pr_info("Dynamic Preempt: voluntary\n"); - break; - - case preempt_dynamic_full: + pr_info("Dynamic Preempt: %s\n", str); + } else if (!strcmp(str, "full")) { static_call_update(cond_resched, (typeof(&__cond_resched)) __static_call_return0); static_call_update(might_resched, (typeof(&__cond_resched)) __static_call_return0); static_call_update(preempt_schedule, __preempt_schedule_func); static_call_update(preempt_schedule_notrace, __preempt_schedule_notrace_func); static_call_update(irqentry_exit_cond_resched, irqentry_exit_cond_resched); - pr_info("Dynamic Preempt: full\n"); - break; - } - - preempt_dynamic_mode = mode; -} - -static int __init setup_preempt_mode(char *str) -{ - int mode = sched_dynamic_mode(str); - if (mode < 0) { - pr_warn("Dynamic Preempt: unsupported mode: %s\n", str); + pr_info("Dynamic Preempt: %s\n", str); + } else { + pr_warn("Dynamic Preempt: Unsupported preempt mode %s, default to full\n", str); return 1; } - - sched_dynamic_update(mode); return 0; } __setup("preempt=", setup_preempt_mode); -#ifdef CONFIG_SCHED_DEBUG - -static ssize_t sched_dynamic_write(struct file *filp, const char __user *ubuf, - size_t cnt, loff_t *ppos) -{ - char buf[16]; - int mode; - - if (cnt > 15) - cnt = 15; - - if (copy_from_user(&buf, ubuf, cnt)) - return -EFAULT; - - buf[cnt] = 0; - mode = sched_dynamic_mode(strstrip(buf)); - if (mode < 0) - return mode; - - sched_dynamic_update(mode); - - *ppos += cnt; - - return cnt; -} - -static int sched_dynamic_show(struct seq_file *m, void *v) -{ - static const char * preempt_modes[] = { - "none", "voluntary", "full" - }; - int i; - - for (i = 0; i < ARRAY_SIZE(preempt_modes); i++) { - if (preempt_dynamic_mode == i) - seq_puts(m, "("); - seq_puts(m, preempt_modes[i]); - if (preempt_dynamic_mode == i) - seq_puts(m, ")"); - - seq_puts(m, " "); - } - - seq_puts(m, "\n"); - return 0; -} - -static int sched_dynamic_open(struct inode *inode, struct file *filp) -{ - return single_open(filp, sched_dynamic_show, NULL); -} - -static const struct file_operations sched_dynamic_fops = { - .open = sched_dynamic_open, - .write = sched_dynamic_write, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -extern struct dentry *debugfs_sched; - -static __init int sched_init_debug_dynamic(void) -{ - debugfs_create_file("sched_preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops); - return 0; -} -late_initcall(sched_init_debug_dynamic); - -#endif /* CONFIG_SCHED_DEBUG */ #endif /* CONFIG_PREEMPT_DYNAMIC */