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gettimeofday(): an implementation based on CPU invariant TSC support

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This commit is contained in:
Balazs Gerofi
2015-08-24 23:41:31 +02:00
parent b8f166e608
commit 9ae5bcf46e
8 changed files with 193 additions and 33 deletions
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26
kernel/init.c
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@ -200,6 +200,14 @@ static void pc_test(void)
ed[1] - st[1], ed[2] - st[2], ed[3] - st[3]);
}
extern void ihk_mc_get_boot_time(unsigned long *tv_sec, unsigned long *tv_nsec);
static void time_init(void)
{
ihk_mc_get_boot_time(&cpu_local_var(tv_sec),
&cpu_local_var(tv_nsec));
cpu_local_var(last_tsc) = 0;
}
static void rest_init(void)
{
handler_init();
@ -212,6 +220,7 @@ static void rest_init(void)
ap_init();
cpu_local_var_init();
time_init();
kmalloc_init();
ikc_master_init();
@ -220,9 +229,13 @@ static void rest_init(void)
}
int host_ikc_inited = 0;
extern int num_processors;
extern void zero_tsc(void);
extern void update_cpu_local_time(void);
static void post_init(void)
{
int i;
cpu_enable_interrupt();
while (!host_ikc_inited) {
@ -237,7 +250,20 @@ static void post_init(void)
init_host_syscall_channel2();
ihk_mc_spinlock_init(&syscall_lock);
}
/* Update time elapsed so far during boot, distribute the current
* date to all cores and zero TSC.
* All AP cores are wait spinning for ap_start() and they will zero
* their TSC immediatly. */
update_cpu_local_time();
cpu_local_var(last_tsc) = 0;
for (i = 0; i < num_processors; ++i) {
get_cpu_local_var(i)->tv_sec = cpu_local_var(tv_sec);
get_cpu_local_var(i)->tv_nsec = cpu_local_var(tv_nsec);
}
zero_tsc();
ap_start();
create_os_procfs_files();
}
#ifdef DCFA_RUN