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add flag to control vmexit sample in HV bootargs

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for vmexit data sampling could affect HV performace profiling,
so set it disabled by default.

add a flag in HV bootargs to control vmexit data sampling.

Tracked-On: #5232
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
This commit is contained in:
Minggui Cao 2020-08-25 16:19:23 +08:00 committed by wenlingz
parent ea2650918b
commit 25fff0c21a
4 changed files with 54 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
hypervisor/common/hv_main.c
View File

@ -14,6 +14,7 @@
#include <sprintf.h>
#include <trace.h>
#include <logmsg.h>
#include <shell.h>
void vcpu_thread(struct thread_object *obj)
{
@ -47,31 +48,33 @@ void vcpu_thread(struct thread_object *obj)
profiling_vmenter_handler(vcpu);
#ifdef HV_DEBUG
vmexit_end = rdtsc();
if (vmexit_begin != 0UL) {
uint64_t delta = vmexit_end - vmexit_begin;
uint32_t us = (uint32_t)ticks_to_us(delta);
uint16_t fls = (uint16_t)(fls32(us) + 1); /* to avoid us = 0 case, then fls=0xFFFF */
uint16_t index = 0;
if (is_vmexit_sample_enabled()) {
vmexit_end = rdtsc();
if (vmexit_begin != 0UL) {
uint64_t delta = vmexit_end - vmexit_begin;
uint32_t us = (uint32_t)ticks_to_us(delta);
uint16_t fls = (uint16_t)(fls32(us) + 1); /* to avoid us = 0 case, then fls=0xFFFF */
uint16_t index = 0;
if (fls >= MAX_VMEXIT_LEVEL) {
index = MAX_VMEXIT_LEVEL - 1;
} else if (fls > 0) { //if fls == 0, it means the us = 0
index = fls - 1;
}
if (fls >= MAX_VMEXIT_LEVEL) {
index = MAX_VMEXIT_LEVEL - 1;
} else if (fls > 0) { //if fls == 0, it means the us = 0
index = fls - 1;
}
get_cpu_var(vmexit_cnt)[basic_exit_reason][index]++;
get_cpu_var(vmexit_time)[basic_exit_reason][0] += delta;
get_cpu_var(vmexit_cnt)[basic_exit_reason][index]++;
get_cpu_var(vmexit_time)[basic_exit_reason][0] += delta;
vcpu->vmexit_cnt[basic_exit_reason][index]++;
vcpu->vmexit_time[basic_exit_reason][0] += delta;
vcpu->vmexit_cnt[basic_exit_reason][index]++;
vcpu->vmexit_time[basic_exit_reason][0] += delta;
if (us > get_cpu_var(vmexit_time)[basic_exit_reason][1]) {
get_cpu_var(vmexit_time)[basic_exit_reason][1] = us;
}
if (us > get_cpu_var(vmexit_time)[basic_exit_reason][1]) {
get_cpu_var(vmexit_time)[basic_exit_reason][1] = us;
}
if (us > vcpu->vmexit_time[basic_exit_reason][1]) {
vcpu->vmexit_time[basic_exit_reason][1] = us;
if (us > vcpu->vmexit_time[basic_exit_reason][1]) {
vcpu->vmexit_time[basic_exit_reason][1] = us;
}
}
}
#endif
@ -87,9 +90,11 @@ void vcpu_thread(struct thread_object *obj)
TRACE_2L(TRACE_VM_EXIT, basic_exit_reason, vcpu_get_rip(vcpu));
#ifdef HV_DEBUG
vmexit_begin = rdtsc();
get_cpu_var(vmexit_cnt)[basic_exit_reason][TOTAL_ARRAY_LEVEL - 1]++;
vcpu->vmexit_cnt[basic_exit_reason][TOTAL_ARRAY_LEVEL - 1]++;
if (is_vmexit_sample_enabled()) {
vmexit_begin = rdtsc();
get_cpu_var(vmexit_cnt)[basic_exit_reason][TOTAL_ARRAY_LEVEL - 1]++;
vcpu->vmexit_cnt[basic_exit_reason][TOTAL_ARRAY_LEVEL - 1]++;
}
#endif
vcpu->arch.nrexits++;

6
hypervisor/debug/dbg_cmd.c
View File

@ -10,6 +10,7 @@
#include <uart16550.h>
#include <dbg_cmd.h>
#include <vm_config.h>
#include <shell.h>
#define MAX_PORT 0x10000 /* port 0 - 64K */
#define DEFAULT_UART_PORT 0x3F8
@ -20,6 +21,7 @@ static const char * const cmd_list[] = {
"uart=disabled", /* to disable uart */
"uart=port@", /* like uart=port@0x3F8 */
"uart=bdf@", /*like: uart=bdf@0:18.2, it is for ttyS2 */
"vmexit=enable"
};
enum IDX_CMD_DBG {
@ -27,6 +29,7 @@ enum IDX_CMD_DBG {
IDX_PORT_UART,
IDX_PCI_UART,
IDX_SET_VMEXIT,
IDX_MAX_CMD,
};
@ -104,6 +107,9 @@ bool handle_dbg_cmd(const char *cmd, int32_t len)
} else if (i == IDX_PCI_UART) {
uart16550_set_property(true, false, (uint64_t)(cmd+tmp));
} else if (i == IDX_SET_VMEXIT) {
set_vmexit_sample_flag(true);
} else {
/* No other state currently, do nothing */
}

17
hypervisor/debug/shell.c
View File

@ -1913,12 +1913,19 @@ static void clear_vmexit_info_buffer(void)
}
/* used to control sample vmexit data */
static bool vmexit_sample_flag = false;
static int shell_show_vmexit_profile(__unused int argc, __unused char **argv)
{
if ((argc == 2) && (strcmp(argv[1], "clear") == 0)) {
clear_vmexit_info_buffer();
}
if (!vmexit_sample_flag) {
printf("not enable to sample vmexit data!");
}
get_vmexit_profile_per_pcpu(shell_log_buf, SHELL_LOG_BUF_SIZE);
shell_puts(shell_log_buf);
@ -1933,3 +1940,13 @@ static int shell_show_vmexit_profile(__unused int argc, __unused char **argv)
return 0;
}
void set_vmexit_sample_flag(bool to_enable)
{
vmexit_sample_flag = to_enable;
}
bool is_vmexit_sample_enabled(void)
{
return vmexit_sample_flag;
}

3
hypervisor/include/debug/shell.h
View File

@ -10,4 +10,7 @@
void shell_init(void);
void shell_kick(void);
void set_vmexit_sample_flag(bool to_enable);
bool is_vmexit_sample_enabled(void);
#endif /* SHELL_H */