+++ /dev/null
-/* test-mark.c
- *
- */
-
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/sched.h>
-#include <linux/timex.h>
-#include <linux/marker.h>
-#include <asm/ptrace.h>
-#include <asm/system.h>
-
-static void pmc_flush_cache(void)
- {
- register int i;
- /* write back and invalidate cache (a serializing instruction) */
-
- __asm__ __volatile__ ( "wbinvd" : : : "memory" );
-
- /* The wbinvd instruction does not wait for the external caches
- * to be flushed, but only requests that it be done. The loop
- * is to be sure that enough time has elapsed, but the compiler
- * might simplify or even remove it. The loop bound is for a
- * 512 KB L2 cache. On a Pentium Pro/II/III, the loop uses
- * 2 cycles per iteration.
- *
- * Does wbinvd also cause the TLB to be flushed?
- * A comment in mtrr.c suggests that it does.
- */
- for (i = 0; i < 512*1024; i++) {
- cpu_relax();
- }
- }
-
-
-static void noinline test2(const struct marker *mdata,
- void *call_private, ...)
-{
- unsigned char *ins = __builtin_return_address(0) - 5;
-#if 0
- /* not called */
- printk("ip %p\n", __builtin_return_address(0));
- printk("prev_ins %hX %hX %hX %hX %hX\n",
- ins[0], ins[1], ins[2], ins[3], ins[4]);
-#endif //0
- ins[0] = 0x90;
- ins[1] = 0x8d;
- ins[2] = 0x74;
- ins[3] = 0x26;
- ins[4] = 0x00;
-}
-
-/*
- * Generic marker flavor always available.
- * Note : the empty asm volatile with read constraint is used here instead of a
- * "used" attribute to fix a gcc 4.1.x bug.
- * Make sure the alignment of the structure in the __markers section will
- * not add unwanted padding between the beginning of the section and the
- * structure. Force alignment to the same alignment as the section start.
- */
-#define __my_trace_mark(generic, name, call_private, format, args...) \
- do { \
- static const char __mstrtab_##name[] \
- __attribute__((section("__markers_strings"))) \
- = #name "\0" format; \
- static struct marker __mark_##name \
- __attribute__((section("__markers"), aligned(8))) = \
- { __mstrtab_##name, &__mstrtab_##name[sizeof(#name)], \
- 0, 0, marker_probe_cb, \
- { __mark_empty_function, NULL}, NULL }; \
- __mark_check_format(format, ## args); \
- if (!generic) { \
- if (unlikely(imv_read(__mark_##name.state))) \
- test2 \
- (&__mark_##name, call_private, \
- ## args); \
- } else { \
- if (unlikely(_imv_read(__mark_##name.state))) \
- test2 \
- (&__mark_##name, call_private, \
- ## args); \
- } \
- } while (0)
-
-struct proc_dir_entry *pentry = NULL;
-
-static inline void test(unsigned long arg, unsigned long arg2)
-{
- volatile int temp[5];
-#ifdef CACHEFLUSH
- clflush(¤t->pid);
- //pmc_flush_cache();
-#endif
- temp[2] = (temp[0] + 60) << 10;
- temp[3] = (temp[2] + 60) << 10;
- temp[4] = (temp[3] + 60) << 10;
- temp[0] = (temp[4] + 60) << 10;
- //asm volatile ("");
- //__my_trace_mark(1, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
- barrier();
- test2(NULL, NULL, 2, 10, arg, arg2);
- barrier(); // make sure the compiler does not optimize marker conditions away!
- //__my_trace_mark(0, kernel_debug_test, NULL, "%d %d %ld %ld", 2, current->pid, arg, arg2);
-}
-
-static int my_open(struct inode *inode, struct file *file)
-{
- unsigned int i;
- cycles_t cycles1, cycles2;
- unsigned long flags;
-
- local_irq_save(flags);
-#ifdef CACHEFLUSH
- //pmc_flush_cache(); /* initial write back, without cycle count */
- //msleep(20); /* wait for L2 flush */
-#endif
- rdtsc_barrier();
- cycles1 = get_cycles();
- rdtsc_barrier();
- for(i=0; i<2000; i++) {
- test(i, i);
- test(i, i);
- test(i, i);
- test(i, i);
- test(i, i);
- test(i, i);
- test(i, i);
- test(i, i);
- test(i, i);
- test(i, i);
- }
- rdtsc_barrier();
- cycles2 = get_cycles();
- rdtsc_barrier();
- local_irq_restore(flags);
- printk("cycles : %llu\n", cycles2-cycles1);
- return -EPERM;
-}
-
-
-static struct file_operations my_operations = {
- .open = my_open,
-};
-
-int init_module(void)
-{
- pentry = create_proc_entry("testmark", 0444, NULL);
- if (pentry)
- pentry->proc_fops = &my_operations;
-
- return 0;
-}
-
-void cleanup_module(void)
-{
- remove_proc_entry("testmark", NULL);
-}
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Mathieu Desnoyers");
-MODULE_DESCRIPTION("Marker Test");
-MODULE_VERSION("1.0");
-
projects / lttv.git / blobdiff