[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/kernel/delayacct.c b/ap/os/linux/linux-3.4.x/kernel/delayacct.c
new file mode 100644
index 0000000..418b3f7
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/kernel/delayacct.c
@@ -0,0 +1,186 @@
+/* delayacct.c - per-task delay accounting
+ *
+ * Copyright (C) Shailabh Nagar, IBM Corp. 2006
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/taskstats.h>
+#include <linux/time.h>
+#include <linux/sysctl.h>
+#include <linux/delayacct.h>
+#include <linux/module.h>
+
+int delayacct_on __read_mostly = 1; /* Delay accounting turned on/off */
+EXPORT_SYMBOL_GPL(delayacct_on);
+struct kmem_cache *delayacct_cache;
+
+static int __init delayacct_setup_disable(char *str)
+{
+ delayacct_on = 0;
+ return 1;
+}
+__setup("nodelayacct", delayacct_setup_disable);
+
+void delayacct_init(void)
+{
+ delayacct_cache = KMEM_CACHE(task_delay_info, SLAB_PANIC);
+ delayacct_tsk_init(&init_task);
+}
+
+void __delayacct_tsk_init(struct task_struct *tsk)
+{
+ tsk->delays = kmem_cache_zalloc(delayacct_cache, GFP_KERNEL);
+ if (tsk->delays)
+ spin_lock_init(&tsk->delays->lock);
+}
+
+/*
+ * Start accounting for a delay statistic using
+ * its starting timestamp (@start)
+ */
+
+static inline void delayacct_start(struct timespec *start)
+{
+ do_posix_clock_monotonic_gettime(start);
+}
+
+/*
+ * Finish delay accounting for a statistic using
+ * its timestamps (@start, @end), accumalator (@total) and @count
+ */
+
+static void delayacct_end(struct timespec *start, struct timespec *end,
+ u64 *total, u32 *count)
+{
+ struct timespec ts;
+ s64 ns;
+ unsigned long flags;
+
+ do_posix_clock_monotonic_gettime(end);
+ ts = timespec_sub(*end, *start);
+ ns = timespec_to_ns(&ts);
+ if (ns < 0)
+ return;
+
+ spin_lock_irqsave(¤t->delays->lock, flags);
+ *total += ns;
+ (*count)++;
+ spin_unlock_irqrestore(¤t->delays->lock, flags);
+}
+
+void __delayacct_blkio_start(void)
+{
+ delayacct_start(¤t->delays->blkio_start);
+}
+
+void __delayacct_blkio_end(void)
+{
+ if (current->delays->flags & DELAYACCT_PF_SWAPIN)
+ /* Swapin block I/O */
+ delayacct_end(¤t->delays->blkio_start,
+ ¤t->delays->blkio_end,
+ ¤t->delays->swapin_delay,
+ ¤t->delays->swapin_count);
+ else /* Other block I/O */
+ delayacct_end(¤t->delays->blkio_start,
+ ¤t->delays->blkio_end,
+ ¤t->delays->blkio_delay,
+ ¤t->delays->blkio_count);
+}
+
+int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
+{
+ s64 tmp;
+ unsigned long t1;
+ unsigned long long t2, t3;
+ unsigned long flags;
+ struct timespec ts;
+
+ /* Though tsk->delays accessed later, early exit avoids
+ * unnecessary returning of other data
+ */
+ if (!tsk->delays)
+ goto done;
+
+ tmp = (s64)d->cpu_run_real_total;
+ cputime_to_timespec(tsk->utime + tsk->stime, &ts);
+ tmp += timespec_to_ns(&ts);
+ d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
+
+ tmp = (s64)d->cpu_scaled_run_real_total;
+ cputime_to_timespec(tsk->utimescaled + tsk->stimescaled, &ts);
+ tmp += timespec_to_ns(&ts);
+ d->cpu_scaled_run_real_total =
+ (tmp < (s64)d->cpu_scaled_run_real_total) ? 0 : tmp;
+
+ /*
+ * No locking available for sched_info (and too expensive to add one)
+ * Mitigate by taking snapshot of values
+ */
+ t1 = tsk->sched_info.pcount;
+ t2 = tsk->sched_info.run_delay;
+ t3 = tsk->se.sum_exec_runtime;
+
+ d->cpu_count += t1;
+
+ tmp = (s64)d->cpu_delay_total + t2;
+ d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
+
+ tmp = (s64)d->cpu_run_virtual_total + t3;
+ d->cpu_run_virtual_total =
+ (tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
+
+ /* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */
+
+ spin_lock_irqsave(&tsk->delays->lock, flags);
+ tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
+ d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
+ tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
+ d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
+ tmp = d->freepages_delay_total + tsk->delays->freepages_delay;
+ d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
+ d->blkio_count += tsk->delays->blkio_count;
+ d->swapin_count += tsk->delays->swapin_count;
+ d->freepages_count += tsk->delays->freepages_count;
+ spin_unlock_irqrestore(&tsk->delays->lock, flags);
+
+done:
+ return 0;
+}
+
+__u64 __delayacct_blkio_ticks(struct task_struct *tsk)
+{
+ __u64 ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tsk->delays->lock, flags);
+ ret = nsec_to_clock_t(tsk->delays->blkio_delay +
+ tsk->delays->swapin_delay);
+ spin_unlock_irqrestore(&tsk->delays->lock, flags);
+ return ret;
+}
+
+void __delayacct_freepages_start(void)
+{
+ delayacct_start(¤t->delays->freepages_start);
+}
+
+void __delayacct_freepages_end(void)
+{
+ delayacct_end(¤t->delays->freepages_start,
+ ¤t->delays->freepages_end,
+ ¤t->delays->freepages_delay,
+ ¤t->delays->freepages_count);
+}
+