From: Waiman Long <longman@redhat.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Jonathan Corbet <corbet@lwn.net>
Cc: linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Davidlohr Bueso <dave@stgolabs.net>,
Mike Galbraith <umgwanakikbuti@gmail.com>,
Scott J Norton <scott.norton@hpe.com>,
Waiman Long <longman@redhat.com>
Subject: [PATCH v4 01/20] futex: Consolidate duplicated timer setup code
Date: Thu, 29 Dec 2016 11:13:27 -0500 [thread overview]
Message-ID: <1483028026-10305-2-git-send-email-longman@redhat.com> (raw)
In-Reply-To: <1483028026-10305-1-git-send-email-longman@redhat.com>
A new futex_setup_timer() helper function is added to consolidate all
the hrtimer_sleeper setup code.
Signed-off-by: Waiman Long <longman@redhat.com>
---
kernel/futex.c | 67 ++++++++++++++++++++++++++++++++--------------------------
1 file changed, 37 insertions(+), 30 deletions(-)
diff --git a/kernel/futex.c b/kernel/futex.c
index 9246d9f..0ea1b57 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -477,6 +477,35 @@ static void drop_futex_key_refs(union futex_key *key)
}
/**
+ * futex_setup_timer - set up the sleeping hrtimer.
+ * @time: ptr to the given timeout value
+ * @timeout: the hrtimer_sleeper structure to be set up
+ * @flags: futex flags
+ * @range_ns: optional range in ns
+ *
+ * Return: Initialized hrtimer_sleeper structure or NULL if no timeout
+ * value given
+ */
+static inline struct hrtimer_sleeper *
+futex_setup_timer(ktime_t *time, struct hrtimer_sleeper *timeout,
+ int flags, u64 range_ns)
+{
+ if (!time)
+ return NULL;
+
+ hrtimer_init_on_stack(&timeout->timer, (flags & FLAGS_CLOCKRT) ?
+ CLOCK_REALTIME : CLOCK_MONOTONIC,
+ HRTIMER_MODE_ABS);
+ hrtimer_init_sleeper(timeout, current);
+ if (range_ns)
+ hrtimer_set_expires_range_ns(&timeout->timer, *time, range_ns);
+ else
+ hrtimer_set_expires(&timeout->timer, *time);
+
+ return timeout;
+}
+
+/**
* get_futex_key() - Get parameters which are the keys for a futex
* @uaddr: virtual address of the futex
* @fshared: 0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
@@ -2402,7 +2431,7 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, unsigned int flags,
static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val,
ktime_t *abs_time, u32 bitset)
{
- struct hrtimer_sleeper timeout, *to = NULL;
+ struct hrtimer_sleeper timeout, *to;
struct restart_block *restart;
struct futex_hash_bucket *hb;
struct futex_q q = futex_q_init;
@@ -2412,17 +2441,8 @@ static int futex_wait(u32 __user *uaddr, unsigned int flags, u32 val,
return -EINVAL;
q.bitset = bitset;
- if (abs_time) {
- to = &timeout;
-
- hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
- CLOCK_REALTIME : CLOCK_MONOTONIC,
- HRTIMER_MODE_ABS);
- hrtimer_init_sleeper(to, current);
- hrtimer_set_expires_range_ns(&to->timer, *abs_time,
- current->timer_slack_ns);
- }
-
+ to = futex_setup_timer(abs_time, &timeout, flags,
+ current->timer_slack_ns);
retry:
/*
* Prepare to wait on uaddr. On success, holds hb lock and increments
@@ -2502,7 +2522,7 @@ static long futex_wait_restart(struct restart_block *restart)
static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
ktime_t *time, int trylock)
{
- struct hrtimer_sleeper timeout, *to = NULL;
+ struct hrtimer_sleeper timeout, *to;
struct futex_hash_bucket *hb;
struct futex_q q = futex_q_init;
int res, ret;
@@ -2510,13 +2530,7 @@ static int futex_lock_pi(u32 __user *uaddr, unsigned int flags,
if (refill_pi_state_cache())
return -ENOMEM;
- if (time) {
- to = &timeout;
- hrtimer_init_on_stack(&to->timer, CLOCK_REALTIME,
- HRTIMER_MODE_ABS);
- hrtimer_init_sleeper(to, current);
- hrtimer_set_expires(&to->timer, *time);
- }
+ to = futex_setup_timer(time, &timeout, FLAGS_CLOCKRT, 0);
retry:
ret = get_futex_key(uaddr, flags & FLAGS_SHARED, &q.key, VERIFY_WRITE);
@@ -2811,7 +2825,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
u32 val, ktime_t *abs_time, u32 bitset,
u32 __user *uaddr2)
{
- struct hrtimer_sleeper timeout, *to = NULL;
+ struct hrtimer_sleeper timeout, *to;
struct rt_mutex_waiter rt_waiter;
struct rt_mutex *pi_mutex = NULL;
struct futex_hash_bucket *hb;
@@ -2825,15 +2839,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
if (!bitset)
return -EINVAL;
- if (abs_time) {
- to = &timeout;
- hrtimer_init_on_stack(&to->timer, (flags & FLAGS_CLOCKRT) ?
- CLOCK_REALTIME : CLOCK_MONOTONIC,
- HRTIMER_MODE_ABS);
- hrtimer_init_sleeper(to, current);
- hrtimer_set_expires_range_ns(&to->timer, *abs_time,
- current->timer_slack_ns);
- }
+ to = futex_setup_timer(abs_time, &timeout, flags,
+ current->timer_slack_ns);
/*
* The waiter is allocated on our stack, manipulated by the requeue
--
1.8.3.1
next prev parent reply other threads:[~2016-12-29 16:14 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-29 16:13 [PATCH v4 00/20] futex: Introducing throughput-optimized (TP) futexes Waiman Long
2016-12-29 16:13 ` Waiman Long [this message]
2016-12-29 16:13 ` [PATCH v4 02/20] futex: Rename futex_pi_state to futex_state Waiman Long
2016-12-29 16:13 ` [PATCH v4 03/20] futex: Add helpers to get & cmpxchg futex value without lock Waiman Long
2016-12-29 16:13 ` [PATCH v4 04/20] futex: Consolidate pure pi_state_list add & delete codes to helpers Waiman Long
2016-12-29 16:13 ` [PATCH v4 05/20] futex: Add a new futex type field into futex_state Waiman Long
2016-12-29 16:13 ` [PATCH v4 06/20] futex: Allow direct attachment of futex_state objects to hash bucket Waiman Long
2016-12-29 16:13 ` [PATCH v4 07/20] futex: Introduce throughput-optimized (TP) futexes Waiman Long
2016-12-29 21:17 ` kbuild test robot
2016-12-29 16:13 ` [PATCH v4 08/20] TP-futex: Enable robust handling Waiman Long
2016-12-29 16:13 ` [PATCH v4 09/20] TP-futex: Implement lock handoff to prevent lock starvation Waiman Long
2016-12-29 16:13 ` [PATCH v4 10/20] TP-futex: Return status code on FUTEX_LOCK calls Waiman Long
2016-12-29 16:13 ` [PATCH v4 11/20] TP-futex: Add timeout support Waiman Long
2016-12-29 16:13 ` [PATCH v4 12/20] TP-futex, doc: Add TP futexes documentation Waiman Long
2016-12-29 16:13 ` [PATCH v4 13/20] perf bench: New microbenchmark for userspace mutex performance Waiman Long
2017-01-02 17:16 ` Arnaldo Carvalho de Melo
2017-01-02 18:17 ` Waiman Long
2016-12-29 16:13 ` [PATCH v4 14/20] TP-futex: Support userspace reader/writer locks Waiman Long
2016-12-29 18:34 ` kbuild test robot
2016-12-29 16:13 ` [PATCH v4 15/20] TP-futex: Enable kernel reader lock stealing Waiman Long
2016-12-29 16:13 ` [PATCH v4 16/20] TP-futex: Group readers together in wait queue Waiman Long
2016-12-29 19:53 ` kbuild test robot
2016-12-29 20:16 ` kbuild test robot
2016-12-29 16:13 ` [PATCH v4 17/20] TP-futex, doc: Update TP futexes document on shared locking Waiman Long
2016-12-29 16:13 ` [PATCH v4 18/20] perf bench: New microbenchmark for userspace rwlock performance Waiman Long
2016-12-29 16:13 ` [PATCH v4 19/20] sched, TP-futex: Make wake_up_q() return wakeup count Waiman Long
2016-12-29 16:13 ` [PATCH v4 20/20] futex: Dump internal futex state via debugfs Waiman Long
2016-12-29 18:55 ` kbuild test robot
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