diff options
author | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-03-23 14:51:03 +1100 |
---|---|---|
committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-03-23 14:51:05 +1100 |
commit | cede03968c618e69876ced04562be799b03adfdb (patch) | |
tree | c1d55a45c9e84ec924c578df798fc501dfb1175d /kernel | |
parent | 1b45c3e50734533ce7b2228787fa341e0cd70778 (diff) | |
parent | 20518a1747d56d33dd3419569d25334b096c3974 (diff) |
Merge branch 'akpm-current/current'
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/hung_task.c | 8 | ||||
-rw-r--r-- | kernel/locking/lockdep.c | 11 | ||||
-rw-r--r-- | kernel/locking/qspinlock_paravirt.h | 3 | ||||
-rw-r--r-- | kernel/pid.c | 7 | ||||
-rw-r--r-- | kernel/taskstats.c | 14 |
5 files changed, 34 insertions, 9 deletions
diff --git a/kernel/hung_task.c b/kernel/hung_task.c index f0f8e2a8496f..751593ed7c0b 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -43,6 +43,7 @@ unsigned long __read_mostly sysctl_hung_task_timeout_secs = CONFIG_DEFAULT_HUNG_ int __read_mostly sysctl_hung_task_warnings = 10; static int __read_mostly did_panic; +static bool hung_task_show_lock; static struct task_struct *watchdog_task; @@ -120,12 +121,14 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout) pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\"" " disables this message.\n"); sched_show_task(t); - debug_show_all_locks(); + hung_task_show_lock = true; } touch_nmi_watchdog(); if (sysctl_hung_task_panic) { + if (hung_task_show_lock) + debug_show_all_locks(); trigger_all_cpu_backtrace(); panic("hung_task: blocked tasks"); } @@ -172,6 +175,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout) if (test_taint(TAINT_DIE) || did_panic) return; + hung_task_show_lock = false; rcu_read_lock(); for_each_process_thread(g, t) { if (!max_count--) @@ -187,6 +191,8 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout) } unlock: rcu_read_unlock(); + if (hung_task_show_lock) + debug_show_all_locks(); } static long hung_timeout_jiffies(unsigned long last_checked, diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 23ca53e8d3fb..c0e31bfee25c 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -30,6 +30,7 @@ #include <linux/sched.h> #include <linux/sched/clock.h> #include <linux/sched/task.h> +#include <linux/sched/mm.h> #include <linux/delay.h> #include <linux/module.h> #include <linux/proc_fs.h> @@ -2876,6 +2877,8 @@ static void __lockdep_trace_alloc(gfp_t gfp_mask, unsigned long flags) if (unlikely(!debug_locks)) return; + gfp_mask = current_gfp_context(gfp_mask); + /* no reclaim without waiting on it */ if (!(gfp_mask & __GFP_DIRECT_RECLAIM)) return; @@ -2885,7 +2888,7 @@ static void __lockdep_trace_alloc(gfp_t gfp_mask, unsigned long flags) return; /* We're only interested __GFP_FS allocations for now */ - if (!(gfp_mask & __GFP_FS)) + if (!(gfp_mask & __GFP_FS) || (curr->flags & PF_MEMALLOC_NOFS)) return; /* @@ -2894,6 +2897,10 @@ static void __lockdep_trace_alloc(gfp_t gfp_mask, unsigned long flags) if (DEBUG_LOCKS_WARN_ON(irqs_disabled_flags(flags))) return; + /* Disable lockdep if explicitly requested */ + if (gfp_mask & __GFP_NOLOCKDEP) + return; + mark_held_locks(curr, RECLAIM_FS); } @@ -3947,7 +3954,7 @@ EXPORT_SYMBOL_GPL(lock_unpin_lock); void lockdep_set_current_reclaim_state(gfp_t gfp_mask) { - current->lockdep_reclaim_gfp = gfp_mask; + current->lockdep_reclaim_gfp = current_gfp_context(gfp_mask); } EXPORT_SYMBOL_GPL(lockdep_set_current_reclaim_state); diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h index e6b2f7ad3e51..4ccfcaae5b89 100644 --- a/kernel/locking/qspinlock_paravirt.h +++ b/kernel/locking/qspinlock_paravirt.h @@ -193,7 +193,8 @@ void __init __pv_init_lock_hash(void) */ pv_lock_hash = alloc_large_system_hash("PV qspinlock", sizeof(struct pv_hash_entry), - pv_hash_size, 0, HASH_EARLY, + pv_hash_size, 0, + HASH_EARLY | HASH_ZERO, &pv_lock_hash_bits, NULL, pv_hash_size, pv_hash_size); } diff --git a/kernel/pid.c b/kernel/pid.c index 0143ac0ddceb..a1f8459c70ac 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -573,16 +573,13 @@ struct pid *find_ge_pid(int nr, struct pid_namespace *ns) */ void __init pidhash_init(void) { - unsigned int i, pidhash_size; + unsigned int pidhash_size; pid_hash = alloc_large_system_hash("PID", sizeof(*pid_hash), 0, 18, - HASH_EARLY | HASH_SMALL, + HASH_EARLY | HASH_SMALL | HASH_ZERO, &pidhash_shift, NULL, 0, 4096); pidhash_size = 1U << pidhash_shift; - - for (i = 0; i < pidhash_size; i++) - INIT_HLIST_HEAD(&pid_hash[i]); } void __init pidmap_init(void) diff --git a/kernel/taskstats.c b/kernel/taskstats.c index 8a5e44236f78..4559e914452b 100644 --- a/kernel/taskstats.c +++ b/kernel/taskstats.c @@ -30,6 +30,7 @@ #include <linux/pid_namespace.h> #include <net/genetlink.h> #include <linux/atomic.h> +#include <linux/sched/cputime.h> /* * Maximum length of a cpumask that can be specified in @@ -210,6 +211,8 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) struct task_struct *tsk, *first; unsigned long flags; int rc = -ESRCH; + u64 delta, utime, stime; + u64 start_time; /* * Add additional stats from live tasks except zombie thread group @@ -227,6 +230,7 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) memset(stats, 0, sizeof(*stats)); tsk = first; + start_time = ktime_get_ns(); do { if (tsk->exit_state) continue; @@ -238,6 +242,16 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats) */ delayacct_add_tsk(stats, tsk); + /* calculate task elapsed time in nsec */ + delta = start_time - tsk->start_time; + /* Convert to micro seconds */ + do_div(delta, NSEC_PER_USEC); + stats->ac_etime += delta; + + task_cputime(tsk, &utime, &stime); + stats->ac_utime += div_u64(utime, NSEC_PER_USEC); + stats->ac_stime += div_u64(stime, NSEC_PER_USEC); + stats->nvcsw += tsk->nvcsw; stats->nivcsw += tsk->nivcsw; } while_each_thread(first, tsk); |