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-rw-r--r--arch/x86/Kconfig3
-rw-r--r--include/asm-x86/futex.h6
-rw-r--r--include/linux/futex.h10
-rw-r--r--include/linux/thread_info.h1
-rw-r--r--include/linux/tick.h4
-rw-r--r--include/linux/time.h1
-rw-r--r--kernel/futex.c42
-rw-r--r--kernel/futex_compat.c3
-rw-r--r--kernel/hrtimer.c2
-rw-r--r--kernel/time.c1
-rw-r--r--kernel/time/tick-sched.c2
-rw-r--r--kernel/time/timekeeping.c6
-rw-r--r--kernel/time/timer_list.c2
-rw-r--r--lib/Kconfig.debug2
14 files changed, 68 insertions, 17 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 65b449134cf..93e66678e15 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -44,6 +44,9 @@ config LOCKDEP_SUPPORT
config STACKTRACE_SUPPORT
def_bool y
+config HAVE_LATENCYTOP_SUPPORT
+ def_bool y
+
config SEMAPHORE_SLEEPERS
def_bool y
diff --git a/include/asm-x86/futex.h b/include/asm-x86/futex.h
index 62828d63f1b..9d919264923 100644
--- a/include/asm-x86/futex.h
+++ b/include/asm-x86/futex.h
@@ -30,7 +30,7 @@
"1: movl %2, %0\n \
movl %0, %3\n" \
insn "\n" \
-"2: " LOCK_PREFIX "cmpxchgl %3, %2\n \
+"2: lock; cmpxchgl %3, %2\n \
jnz 1b\n \
3: .section .fixup,\"ax\"\n \
4: mov %5, %1\n \
@@ -72,7 +72,7 @@ futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
__futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
- __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval,
+ __futex_atomic_op1("lock; xaddl %0, %2", ret, oldval,
uaddr, oparg);
break;
case FUTEX_OP_OR:
@@ -111,8 +111,8 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
return -EFAULT;
__asm__ __volatile__(
- "1: " LOCK_PREFIX "cmpxchgl %3, %1 \n"
+ "1: lock; cmpxchgl %3, %1 \n"
"2: .section .fixup, \"ax\" \n"
"3: mov %2, %0 \n"
" jmp 2b \n"
diff --git a/include/linux/futex.h b/include/linux/futex.h
index 1a15f8e237a..90048fb28a3 100644
--- a/include/linux/futex.h
+++ b/include/linux/futex.h
@@ -21,6 +21,8 @@ union ktime;
#define FUTEX_LOCK_PI 6
#define FUTEX_UNLOCK_PI 7
#define FUTEX_TRYLOCK_PI 8
+#define FUTEX_WAIT_BITSET 9
+#define FUTEX_WAKE_BITSET 10
#define FUTEX_PRIVATE_FLAG 128
#define FUTEX_CMD_MASK ~FUTEX_PRIVATE_FLAG
@@ -33,6 +35,8 @@ union ktime;
#define FUTEX_LOCK_PI_PRIVATE (FUTEX_LOCK_PI | FUTEX_PRIVATE_FLAG)
#define FUTEX_UNLOCK_PI_PRIVATE (FUTEX_UNLOCK_PI | FUTEX_PRIVATE_FLAG)
#define FUTEX_TRYLOCK_PI_PRIVATE (FUTEX_TRYLOCK_PI | FUTEX_PRIVATE_FLAG)
+#define FUTEX_WAIT_BITSET_PRIVATE (FUTEX_WAIT_BITS | FUTEX_PRIVATE_FLAG)
+#define FUTEX_WAKE_BITSET_PRIVATE (FUTEX_WAKE_BITS | FUTEX_PRIVATE_FLAG)
/*
* Support for robust futexes: the kernel cleans up held futexes at
@@ -111,6 +115,12 @@ struct robust_list_head {
*/
#define ROBUST_LIST_LIMIT 2048
+/*
+ * bitset with all bits set for the FUTEX_xxx_BITSET OPs to request a
+ * match of any bit.
+ */
+#define FUTEX_BITSET_MATCH_ANY 0xffffffff
+
#ifdef __KERNEL__
long do_futex(u32 __user *uaddr, int op, u32 val, union ktime *timeout,
u32 __user *uaddr2, u32 val2, u32 val3);
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index dfbdfb9836f..421323e5a2d 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -23,6 +23,7 @@ struct restart_block {
u32 *uaddr;
u32 val;
u32 flags;
+ u32 bitset;
u64 time;
} futex;
};
diff --git a/include/linux/tick.h b/include/linux/tick.h
index 0fadf95debe..a881c652f7e 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -39,6 +39,8 @@ enum tick_nohz_mode {
* @idle_calls: Total number of idle calls
* @idle_sleeps: Number of idle calls, where the sched tick was stopped
* @idle_entrytime: Time when the idle call was entered
+ * @idle_waketime: Time when the idle was interrupted
+ * @idle_exittime: Time when the idle state was left
* @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
* @sleep_length: Duration of the current idle sleep
*/
@@ -53,6 +55,8 @@ struct tick_sched {
unsigned long idle_sleeps;
int idle_active;
ktime_t idle_entrytime;
+ ktime_t idle_waketime;
+ ktime_t idle_exittime;
ktime_t idle_sleeptime;
ktime_t idle_lastupdate;
ktime_t sleep_length;
diff --git a/include/linux/time.h b/include/linux/time.h
index b04136d60a2..ceaab9fff15 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -122,6 +122,7 @@ extern void monotonic_to_bootbased(struct timespec *ts);
extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_is_continuous(void);
extern void update_wall_time(void);
+extern void update_xtime_cache(u64 nsec);
/**
* timespec_to_ns - Convert timespec to nanoseconds
diff --git a/kernel/futex.c b/kernel/futex.c
index db9824de8bf..a6baaec44b8 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -109,6 +109,9 @@ struct futex_q {
/* Optional priority inheritance state: */
struct futex_pi_state *pi_state;
struct task_struct *task;
+
+ /* Bitset for the optional bitmasked wakeup */
+ u32 bitset;
};
/*
@@ -722,7 +725,7 @@ double_lock_hb(struct futex_hash_bucket *hb1, struct futex_hash_bucket *hb2)
* to this virtual address:
*/
static int futex_wake(u32 __user *uaddr, struct rw_semaphore *fshared,
- int nr_wake)
+ int nr_wake, u32 bitset)
{
struct futex_hash_bucket *hb;
struct futex_q *this, *next;
@@ -730,6 +733,9 @@ static int futex_wake(u32 __user *uaddr, struct rw_semaphore *fshared,
union futex_key key;
int ret;
+ if (!bitset)
+ return -EINVAL;
+
futex_lock_mm(fshared);
ret = get_futex_key(uaddr, fshared, &key);
@@ -746,6 +752,11 @@ static int futex_wake(u32 __user *uaddr, struct rw_semaphore *fshared,
ret = -EINVAL;
break;
}
+
+ /* Check if one of the bits is set in both bitsets */
+ if (!(this->bitset & bitset))
+ continue;
+
wake_futex(this);
if (++ret >= nr_wake)
break;
@@ -1156,7 +1167,7 @@ static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
static long futex_wait_restart(struct restart_block *restart);
static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
- u32 val, ktime_t *abs_time)
+ u32 val, ktime_t *abs_time, u32 bitset)
{
struct task_struct *curr = current;
DECLARE_WAITQUEUE(wait, curr);
@@ -1167,7 +1178,11 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
struct hrtimer_sleeper t;
int rem = 0;
+ if (!bitset)
+ return -EINVAL;
+
q.pi_state = NULL;
+ q.bitset = bitset;
retry:
futex_lock_mm(fshared);
@@ -1252,6 +1267,8 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
t.timer.expires = *abs_time;
hrtimer_start(&t.timer, t.timer.expires, HRTIMER_MODE_ABS);
+ if (!hrtimer_active(&t.timer))
+ t.task = NULL;
/*
* the timer could have already expired, in which
@@ -1293,6 +1310,7 @@ static int futex_wait(u32 __user *uaddr, struct rw_semaphore *fshared,
restart->futex.uaddr = (u32 *)uaddr;
restart->futex.val = val;
restart->futex.time = abs_time->tv64;
+ restart->futex.bitset = bitset;
restart->futex.flags = 0;
if (fshared)
@@ -1319,7 +1337,8 @@ static long futex_wait_restart(struct restart_block *restart)
restart->fn = do_no_restart_syscall;
if (restart->futex.flags & FLAGS_SHARED)
fshared = &current->mm->mmap_sem;
- return (long)futex_wait(uaddr, fshared, restart->futex.val, &t);
+ return (long)futex_wait(uaddr, fshared, restart->futex.val, &t,
+ restart->futex.bitset);
}
@@ -1535,9 +1554,6 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
owner = rt_mutex_owner(&q.pi_state->pi_mutex);
res = fixup_pi_state_owner(uaddr, &q, owner);
- WARN_ON(rt_mutex_owner(&q.pi_state->pi_mutex) !=
- owner);
-
/* propagate -EFAULT, if the fixup failed */
if (res)
ret = res;
@@ -1943,7 +1959,8 @@ retry:
* PI futexes happens in exit_pi_state():
*/
if (!pi && (uval & FUTEX_WAITERS))
- futex_wake(uaddr, &curr->mm->mmap_sem, 1);
+ futex_wake(uaddr, &curr->mm->mmap_sem, 1,
+ FUTEX_BITSET_MATCH_ANY);
}
return 0;
}
@@ -2043,10 +2060,14 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
switch (cmd) {
case FUTEX_WAIT:
- ret = futex_wait(uaddr, fshared, val, timeout);
+ val3 = FUTEX_BITSET_MATCH_ANY;
+ case FUTEX_WAIT_BITSET:
+ ret = futex_wait(uaddr, fshared, val, timeout, val3);
break;
case FUTEX_WAKE:
- ret = futex_wake(uaddr, fshared, val);
+ val3 = FUTEX_BITSET_MATCH_ANY;
+ case FUTEX_WAKE_BITSET:
+ ret = futex_wake(uaddr, fshared, val, val3);
break;
case FUTEX_FD:
/* non-zero val means F_SETOWN(getpid()) & F_SETSIG(val) */
@@ -2086,7 +2107,8 @@ asmlinkage long sys_futex(u32 __user *uaddr, int op, u32 val,
u32 val2 = 0;
int cmd = op & FUTEX_CMD_MASK;
- if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI)) {
+ if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI ||
+ cmd == FUTEX_WAIT_BITSET)) {
if (copy_from_user(&ts, utime, sizeof(ts)) != 0)
return -EFAULT;
if (!timespec_valid(&ts))
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 0a43def6fee..133d558db45 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -167,7 +167,8 @@ asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
int val2 = 0;
int cmd = op & FUTEX_CMD_MASK;
- if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI)) {
+ if (utime && (cmd == FUTEX_WAIT || cmd == FUTEX_LOCK_PI ||
+ cmd == FUTEX_WAIT_BITSET)) {
if (get_compat_timespec(&ts, utime))
return -EFAULT;
if (!timespec_valid(&ts))
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index bd5d6b5060b..1069998fe25 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1315,6 +1315,8 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
} while (t->task && !signal_pending(current));
+ __set_current_state(TASK_RUNNING);
+
return t->task == NULL;
}
diff --git a/kernel/time.c b/kernel/time.c
index 09d3c45c4da..4064c0566e7 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -129,6 +129,7 @@ static inline void warp_clock(void)
write_seqlock_irq(&xtime_lock);
wall_to_monotonic.tv_sec -= sys_tz.tz_minuteswest * 60;
xtime.tv_sec += sys_tz.tz_minuteswest * 60;
+ update_xtime_cache(0);
write_sequnlock_irq(&xtime_lock);
clock_was_set();
}
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 63f24b55069..88267f0a847 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -137,6 +137,7 @@ void tick_nohz_update_jiffies(void)
cpu_clear(cpu, nohz_cpu_mask);
now = ktime_get();
+ ts->idle_waketime = now;
local_irq_save(flags);
tick_do_update_jiffies64(now);
@@ -400,6 +401,7 @@ void tick_nohz_restart_sched_tick(void)
* Cancel the scheduled timer and restore the tick
*/
ts->tick_stopped = 0;
+ ts->idle_exittime = now;
hrtimer_cancel(&ts->sched_timer);
ts->sched_timer.expires = ts->idle_tick;
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 092a2366b5a..cd5dbc4579c 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -47,7 +47,7 @@ struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
static unsigned long total_sleep_time; /* seconds */
static struct timespec xtime_cache __attribute__ ((aligned (16)));
-static inline void update_xtime_cache(u64 nsec)
+void update_xtime_cache(u64 nsec)
{
xtime_cache = xtime;
timespec_add_ns(&xtime_cache, nsec);
@@ -145,6 +145,7 @@ int do_settimeofday(struct timespec *tv)
set_normalized_timespec(&xtime, sec, nsec);
set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
+ update_xtime_cache(0);
clock->error = 0;
ntp_clear();
@@ -252,8 +253,8 @@ void __init timekeeping_init(void)
xtime.tv_nsec = 0;
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
+ update_xtime_cache(0);
total_sleep_time = 0;
-
write_sequnlock_irqrestore(&xtime_lock, flags);
}
@@ -290,6 +291,7 @@ static int timekeeping_resume(struct sys_device *dev)
}
/* Make sure that we have the correct xtime reference */
timespec_add_ns(&xtime, timekeeping_suspend_nsecs);
+ update_xtime_cache(0);
/* re-base the last cycle value */
clock->cycle_last = clocksource_read(clock);
clock->error = 0;
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 12c5f4cb6b8..d3d94c1a0fd 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -166,6 +166,8 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
P(idle_calls);
P(idle_sleeps);
P_ns(idle_entrytime);
+ P_ns(idle_waketime);
+ P_ns(idle_exittime);
P_ns(idle_sleeptime);
P(last_jiffies);
P(next_jiffies);
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 89f4035b526..0d8a5a4a789 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -581,7 +581,7 @@ config LATENCYTOP
select STACKTRACE
select SCHEDSTATS
select SCHED_DEBUG
- depends on X86 || X86_64
+ depends on HAVE_LATENCYTOP_SUPPORT
help
Enable this option if you want to use the LatencyTOP tool
to find out which userspace is blocking on what kernel operations.
generated by cgit (git 2.34.1) at 2024-11-19 14:30:18 +0000