diff options
Diffstat (limited to 'drivers/gator/gator_trace_sched.c')
| -rw-r--r-- | drivers/gator/gator_trace_sched.c | 191 |
1 files changed, 0 insertions, 191 deletions
diff --git a/drivers/gator/gator_trace_sched.c b/drivers/gator/gator_trace_sched.c deleted file mode 100644 index 08b02709485..00000000000 --- a/drivers/gator/gator_trace_sched.c +++ /dev/null @@ -1,191 +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 <trace/events/sched.h> -#include "gator.h" - -#define SCHED_SWITCH 1 -#define SCHED_PROCESS_EXIT 2 - -#define TASK_MAP_ENTRIES 1024 /* must be power of 2 */ -#define TASK_MAX_COLLISIONS 2 - -static DEFINE_PER_CPU(uint64_t *, taskname_keys); - -enum { - STATE_WAIT_ON_OTHER = 0, - STATE_CONTENTION, - STATE_WAIT_ON_IO, - STATE_WAIT_ON_MUTEX, -}; - -void emit_pid_name(struct task_struct* task) -{ - bool found = false; - char taskcomm[TASK_COMM_LEN + 3]; - unsigned long x, cpu = smp_processor_id(); - uint64_t *keys = &(per_cpu(taskname_keys, cpu)[(task->pid & 0xFF) * TASK_MAX_COLLISIONS]); - uint64_t value; - - value = gator_chksum_crc32(task->comm); - value = (value << 32) | (uint32_t)task->pid; - - // determine if the thread name was emitted already - for (x = 0; x < TASK_MAX_COLLISIONS; x++) { - if (keys[x] == value) { - found = true; - break; - } - } - - if (!found) { - // shift values, new value always in front - uint64_t oldv, newv = value; - for (x = 0; x < TASK_MAX_COLLISIONS; x++) { - oldv = keys[x]; - keys[x] = newv; - newv = oldv; - } - - // emit pid names, cannot use get_task_comm, as it's not exported on all kernel versions - if (strlcpy(taskcomm, task->comm, TASK_COMM_LEN) == TASK_COMM_LEN - 1) { - // append ellipses if task->comm has length of TASK_COMM_LEN - 1 - strcat(taskcomm, "..."); - } - - marshal_pid_name(task->pid, taskcomm); - } -} - - -static void collect_counters(void) -{ - int *buffer, len; - long long *buffer64; - struct gator_interface *gi; - - if (marshal_event_header()) { - list_for_each_entry(gi, &gator_events, list) { - if (gi->read) { - len = gi->read(&buffer); - marshal_event(len, buffer); - } else if (gi->read64) { - len = gi->read64(&buffer64); - marshal_event64(len, buffer64); - } - } - } -} - -static void probe_sched_write(int type, struct task_struct* task, struct task_struct* old_task) -{ - int cookie = 0, state = 0; - int cpu = smp_processor_id(); - int pid = task->pid; - int tgid = task->tgid; - - if (type == SCHED_SWITCH) { - // do as much work as possible before disabling interrupts - cookie = get_exec_cookie(cpu, BACKTRACE_BUF, task); - emit_pid_name(task); - if (old_task->state == TASK_RUNNING) { - state = STATE_CONTENTION; - } else if (old_task->in_iowait) { - state = STATE_WAIT_ON_IO; -#ifdef CONFIG_DEBUG_MUTEXES - } else if (old_task->blocked_on) { - state = STATE_WAIT_ON_MUTEX; -#endif - } else { - state = STATE_WAIT_ON_OTHER; - } - - collect_counters(); - } - - // marshal_sched_trace() disables interrupts as the free may trigger while switch is writing to the buffer; disabling preemption is not sufficient - // is disable interrupts necessary now that exit is used instead of free? - marshal_sched_trace(type, pid, tgid, cookie, state); -} - -// special case used during a suspend of the system -static void trace_sched_insert_idle(void) -{ - marshal_sched_trace(SCHED_SWITCH, 0, 0, 0, 0); -} - -#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 -{ - probe_sched_write(SCHED_SWITCH, next, prev); -} - -GATOR_DEFINE_PROBE(sched_process_exit, TP_PROTO(struct task_struct *p)) -{ - probe_sched_write(SCHED_PROCESS_EXIT, p, 0); -} - -static int register_scheduler_tracepoints(void) { - // register tracepoints - if (GATOR_REGISTER_TRACE(sched_switch)) - goto fail_sched_switch; - if (GATOR_REGISTER_TRACE(sched_process_exit)) - goto fail_sched_process_exit; - pr_debug("gator: registered tracepoints\n"); - - return 0; - - // unregister tracepoints on error -fail_sched_process_exit: - GATOR_UNREGISTER_TRACE(sched_switch); -fail_sched_switch: - pr_err("gator: tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n"); - - return -1; -} - -int gator_trace_sched_start(void) -{ - int cpu, size; - - for_each_present_cpu(cpu) { - size = TASK_MAP_ENTRIES * TASK_MAX_COLLISIONS * sizeof(uint64_t); - per_cpu(taskname_keys, cpu) = (uint64_t*)kmalloc(size, GFP_KERNEL); - if (!per_cpu(taskname_keys, cpu)) - return -1; - memset(per_cpu(taskname_keys, cpu), 0, size); - } - - return register_scheduler_tracepoints(); -} - -void gator_trace_sched_offline(void) -{ - trace_sched_insert_idle(); -} - -static void unregister_scheduler_tracepoints(void) -{ - GATOR_UNREGISTER_TRACE(sched_switch); - GATOR_UNREGISTER_TRACE(sched_process_exit); - pr_debug("gator: unregistered tracepoints\n"); -} - -void gator_trace_sched_stop(void) -{ - int cpu; - unregister_scheduler_tracepoints(); - - for_each_present_cpu(cpu) { - kfree(per_cpu(taskname_keys, cpu)); - } -} |