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Sun, 22 Sep 2019 01:09:15 -0700 (PDT) From: "Pavel Begunkov (Silence)" To: Jens Axboe , Ingo Molnar , Peter Zijlstra , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Pavel Begunkov Subject: [PATCH v2 1/2] sched/wait: Add wait_threshold Date: Sun, 22 Sep 2019 11:08:50 +0300 Message-Id: X-Mailer: git-send-email 2.23.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org From: Pavel Begunkov Add wait_threshold -- a custom wait_event derivative, that waits until a value is equal to or greater than the specified threshold. v2: rebase 1. use full condition instead of event number generator 2. add WQ_THRESHOLD_WAKE_ALWAYS constant Signed-off-by: Pavel Begunkov --- include/linux/wait_threshold.h | 67 ++++++++++++++++++++++++++++++++++ kernel/sched/Makefile | 2 +- kernel/sched/wait_threshold.c | 26 +++++++++++++ 3 files changed, 94 insertions(+), 1 deletion(-) create mode 100644 include/linux/wait_threshold.h create mode 100644 kernel/sched/wait_threshold.c diff --git a/include/linux/wait_threshold.h b/include/linux/wait_threshold.h new file mode 100644 index 000000000000..d8b054504c26 --- /dev/null +++ b/include/linux/wait_threshold.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_WAIT_THRESHOLD_H +#define _LINUX_WAIT_THRESHOLD_H + +#include + +#define WQ_THRESHOLD_WAKE_ALWAYS (~0ui) + +struct wait_threshold_queue_entry { + struct wait_queue_entry wq_entry; + unsigned int threshold; +}; + + +void init_wait_threshold_entry(struct wait_threshold_queue_entry *wtq_entry, + unsigned int threshold); + +static inline void wake_up_threshold(struct wait_queue_head *wq_head, + unsigned int val) +{ + void *arg = (void *)(unsigned long)val; + + __wake_up(wq_head, TASK_NORMAL, 1, arg); +} + +#define ___wait_threshold_event(q, thresh, condition, state, \ + exclusive, ret, cmd) \ +({ \ + __label__ __out; \ + struct wait_queue_head *__wq_head = &q; \ + struct wait_threshold_queue_entry __wtq_entry; \ + struct wait_queue_entry *__wq_entry = &__wtq_entry.wq_entry; \ + long __ret = ret; /* explicit shadow */ \ + \ + init_wait_threshold_entry(&__wtq_entry, thresh); \ + for (;;) { \ + long __int = prepare_to_wait_event(__wq_head, \ + __wq_entry, \ + state); \ + if (condition) \ + break; \ + \ + if (___wait_is_interruptible(state) && __int) { \ + __ret = __int; \ + goto __out; \ + } \ + \ + cmd; \ + } \ + finish_wait(__wq_head, __wq_entry); \ +__out: __ret; \ +}) + +#define __wait_threshold_interruptible(q, thresh, condition) \ + ___wait_threshold_event(q, thresh, condition, TASK_INTERRUPTIBLE, 0, 0,\ + schedule()) + +#define wait_threshold_interruptible(q, threshold, condition) \ +({ \ + int __ret = 0; \ + might_sleep(); \ + if (!(condition)) \ + __ret = __wait_threshold_interruptible(q, \ + threshold, condition); \ + __ret; \ +}) +#endif /* _LINUX_WAIT_THRESHOLD_H */ diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile index 21fb5a5662b5..bb895a3184f9 100644 --- a/kernel/sched/Makefile +++ b/kernel/sched/Makefile @@ -18,7 +18,7 @@ endif obj-y += core.o loadavg.o clock.o cputime.o obj-y += idle.o fair.o rt.o deadline.o -obj-y += wait.o wait_bit.o swait.o completion.o +obj-y += wait.o wait_bit.o wait_threshold.o swait.o completion.o obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o topology.o stop_task.o pelt.o obj-$(CONFIG_SCHED_AUTOGROUP) += autogroup.o diff --git a/kernel/sched/wait_threshold.c b/kernel/sched/wait_threshold.c new file mode 100644 index 000000000000..80a027c02ff3 --- /dev/null +++ b/kernel/sched/wait_threshold.c @@ -0,0 +1,26 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include "sched.h" +#include + +static int wake_threshold_function(struct wait_queue_entry *wq_entry, + unsigned int mode, int sync, void *arg) +{ + unsigned int val = (unsigned int)(unsigned long)arg; + struct wait_threshold_queue_entry *wtq_entry = + container_of(wq_entry, struct wait_threshold_queue_entry, + wq_entry); + + if (val < wtq_entry->threshold) + return 0; + + return default_wake_function(wq_entry, mode, sync, arg); +} + +void init_wait_threshold_entry(struct wait_threshold_queue_entry *wtq_entry, + unsigned int threshold) +{ + init_wait_entry(&wtq_entry->wq_entry, 0); + wtq_entry->wq_entry.func = wake_threshold_function; + wtq_entry->threshold = threshold; +} +EXPORT_SYMBOL(init_wait_threshold_entry); -- 2.23.0