diff options
Diffstat (limited to 'drivers/gator/driver/gator_events_sched.c')
-rw-r--r-- | drivers/gator/driver/gator_events_sched.c | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/drivers/gator/driver/gator_events_sched.c b/drivers/gator/driver/gator_events_sched.c deleted file mode 100644 index 9bed3641dbb..00000000000 --- a/drivers/gator/driver/gator_events_sched.c +++ /dev/null @@ -1,114 +0,0 @@ -/** - * Copyright (C) ARM Limited 2010-2012. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#include "gator.h" -#include <trace/events/sched.h> - -#define SCHED_SWITCH 0 -#define SCHED_TOTAL (SCHED_SWITCH+1) - -static ulong sched_switch_enabled; -static ulong sched_switch_key; -static DEFINE_PER_CPU(int[SCHED_TOTAL], schedCnt); -static DEFINE_PER_CPU(int[SCHED_TOTAL * 2], schedGet); - -#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35) -GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct rq *rq, struct task_struct *prev, struct task_struct *next)) -#else -GATOR_DEFINE_PROBE(sched_switch, TP_PROTO(struct task_struct *prev, struct task_struct *next)) -#endif -{ - unsigned long flags; - - // disable interrupts to synchronize with gator_events_sched_read() - // spinlocks not needed since percpu buffers are used - local_irq_save(flags); - per_cpu(schedCnt, smp_processor_id())[SCHED_SWITCH]++; - local_irq_restore(flags); -} - -static int gator_events_sched_create_files(struct super_block *sb, struct dentry *root) -{ - struct dentry *dir; - - /* switch */ - dir = gatorfs_mkdir(sb, root, "Linux_sched_switch"); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &sched_switch_enabled); - gatorfs_create_ro_ulong(sb, dir, "key", &sched_switch_key); - - return 0; -} - -static int gator_events_sched_start(void) -{ - // register tracepoints - if (sched_switch_enabled) - if (GATOR_REGISTER_TRACE(sched_switch)) - goto sched_switch_exit; - pr_debug("gator: registered scheduler event tracepoints\n"); - - return 0; - - // unregister tracepoints on error -sched_switch_exit: - pr_err("gator: scheduler event tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n"); - - return -1; -} - -static void gator_events_sched_stop(void) -{ - if (sched_switch_enabled) - GATOR_UNREGISTER_TRACE(sched_switch); - pr_debug("gator: unregistered scheduler event tracepoints\n"); - - sched_switch_enabled = 0; -} - -static int gator_events_sched_read(int **buffer) -{ - unsigned long flags; - int len, value; - int cpu = smp_processor_id(); - - len = 0; - if (sched_switch_enabled) { - local_irq_save(flags); - value = per_cpu(schedCnt, cpu)[SCHED_SWITCH]; - per_cpu(schedCnt, cpu)[SCHED_SWITCH] = 0; - local_irq_restore(flags); - per_cpu(schedGet, cpu)[len++] = sched_switch_key; - per_cpu(schedGet, cpu)[len++] = value; - } - - if (buffer) - *buffer = per_cpu(schedGet, cpu); - - return len; -} - -static struct gator_interface gator_events_sched_interface = { - .create_files = gator_events_sched_create_files, - .start = gator_events_sched_start, - .stop = gator_events_sched_stop, - .read = gator_events_sched_read, -}; - -int gator_events_sched_init(void) -{ - sched_switch_enabled = 0; - - sched_switch_key = gator_events_get_key(); - - return gator_events_install(&gator_events_sched_interface); -} -gator_events_init(gator_events_sched_init); |