#include <linux/uaccess.h>
#include <linux/kdb.h>
#include <linux/slab.h>
+#include <linux/ctype.h>
#include "kdb_private.h"
/*
return diag;
}
-/*
- * kdb_task_state_string - Convert a string containing any of the
- * letters DRSTCZEUIMA to a mask for the process state field and
- * return the value. If no argument is supplied, return the mask
- * that corresponds to environment variable PS, DRSTCZEU by
- * default.
- * Inputs:
- * s String to convert
- * Returns:
- * Mask for process state.
- * Notes:
- * The mask folds data from several sources into a single long value, so
- * be careful not to overlap the bits. TASK_* bits are in the LSB,
- * special cases like UNRUNNABLE are in the MSB. As of 2.6.10-rc1 there
- * is no overlap between TASK_* and EXIT_* but that may not always be
- * true, so EXIT_* bits are shifted left 16 bits before being stored in
- * the mask.
- */
-
-/* unrunnable is < 0 */
-#define UNRUNNABLE (1UL << (8*sizeof(unsigned long) - 1))
-#define RUNNING (1UL << (8*sizeof(unsigned long) - 2))
-#define IDLE (1UL << (8*sizeof(unsigned long) - 3))
-#define DAEMON (1UL << (8*sizeof(unsigned long) - 4))
-unsigned long kdb_task_state_string(const char *s)
-{
- long res = 0;
- if (!s) {
- s = kdbgetenv("PS");
- if (!s)
- s = "DRSTCZEU"; /* default value for ps */
- }
- while (*s) {
- switch (*s) {
- case 'D':
- res |= TASK_UNINTERRUPTIBLE;
- break;
- case 'R':
- res |= RUNNING;
- break;
- case 'S':
- res |= TASK_INTERRUPTIBLE;
- break;
- case 'T':
- res |= TASK_STOPPED;
- break;
- case 'C':
- res |= TASK_TRACED;
- break;
- case 'Z':
- res |= EXIT_ZOMBIE << 16;
- break;
- case 'E':
- res |= EXIT_DEAD << 16;
- break;
- case 'U':
- res |= UNRUNNABLE;
- break;
- case 'I':
- res |= IDLE;
- break;
- case 'M':
- res |= DAEMON;
- break;
- case 'A':
- res = ~0UL;
- break;
- default:
- kdb_func_printf("unknown flag '%c' ignored\n", *s);
- break;
- }
- ++s;
- }
- return res;
-}
/*
* kdb_task_state_char - Return the character that represents the task state.
*/
char kdb_task_state_char (const struct task_struct *p)
{
- unsigned int p_state;
unsigned long tmp;
char state;
int cpu;
copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
return 'E';
- cpu = kdb_process_cpu(p);
- p_state = READ_ONCE(p->__state);
- state = (p_state == 0) ? 'R' :
- (p_state < 0) ? 'U' :
- (p_state & TASK_UNINTERRUPTIBLE) ? 'D' :
- (p_state & TASK_STOPPED) ? 'T' :
- (p_state & TASK_TRACED) ? 'C' :
- (p->exit_state & EXIT_ZOMBIE) ? 'Z' :
- (p->exit_state & EXIT_DEAD) ? 'E' :
- (p_state & TASK_INTERRUPTIBLE) ? 'S' : '?';
+ state = task_state_to_char((struct task_struct *) p);
+
if (is_idle_task(p)) {
/* Idle task. Is it really idle, apart from the kdb
* interrupt? */
+ cpu = kdb_process_cpu(p);
if (!kdb_task_has_cpu(p) || kgdb_info[cpu].irq_depth == 1) {
if (cpu != kdb_initial_cpu)
- state = 'I'; /* idle task */
+ state = '-'; /* idle task */
}
- } else if (!p->mm && state == 'S') {
- state = 'M'; /* sleeping system daemon */
+ } else if (!p->mm && strchr("IMS", state)) {
+ state = tolower(state); /* sleeping system daemon */
}
return state;
}
* given by the mask.
* Inputs:
* p struct task for the process
- * mask mask from kdb_task_state_string to select processes
+ * mask set of characters used to select processes; both NULL
+ * and the empty string mean adopt a default filter, which
+ * is to suppress sleeping system daemons and the idle tasks
* Returns:
* True if the process matches at least one criteria defined by the mask.
*/
-unsigned long kdb_task_state(const struct task_struct *p, unsigned long mask)
+bool kdb_task_state(const struct task_struct *p, const char *mask)
{
- char state[] = { kdb_task_state_char(p), '\0' };
- return (mask & kdb_task_state_string(state)) != 0;
+ char state = kdb_task_state_char(p);
+
+ /* If there is no mask, then we will filter code that runs when the
+ * scheduler is idling and any system daemons that are currently
+ * sleeping.
+ */
+ if (!mask || mask[0] == '\0')
+ return !strchr("-ims", state);
+
+ /* A is a special case that matches all states */
+ if (strchr(mask, 'A'))
+ return true;
+
+ return strchr(mask, state);
}
/* Maintain a small stack of kdb_flags to allow recursion without disturbing
projects / linux-2.6-microblaze.git / blobdiff