Messages in this thread Patch in this message | | | From | Junwen Wu <> | Subject | [PATCH v2] thermal/core: Make trans_table tunnable to avoid some needless zero output | Date | Sat, 14 May 2022 14:19:32 +0000 |
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Very high cooling device max state value make trans_table node prompt File too large. We introduce show_state node, tunnable by user,thus trans_table only show show_state'th trans count to the max trans count, in this way trans_table_show's buffer is always less than PAGE_SIZE and shows the important changes.
Signed-off-by: Junwen Wu <wudaemon@163.com> --- drivers/thermal/thermal_sysfs.c | 111 +++++++++++++++++++++++++------- 1 file changed, 86 insertions(+), 25 deletions(-)
diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c index f154bada2906..bb8627aa49b7 100644 --- a/drivers/thermal/thermal_sysfs.c +++ b/drivers/thermal/thermal_sysfs.c @@ -656,6 +656,7 @@ struct cooling_dev_stats { spinlock_t lock; unsigned int total_trans; unsigned long state; + unsigned long show_state; unsigned long max_states; ktime_t last_time; ktime_t *time_in_state; @@ -752,38 +753,93 @@ reset_store(struct device *dev, struct device_attribute *attr, const char *buf, return count; } -static ssize_t trans_table_show(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t +show_state_store(struct device *dev, struct device_attribute *attr, const char *buf, + size_t count) { struct thermal_cooling_device *cdev = to_cooling_device(dev); struct cooling_dev_stats *stats = cdev->stats; - ssize_t len = 0; - int i, j; + unsigned long state; + ssize_t ret; - len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); - len += snprintf(buf + len, PAGE_SIZE - len, " : "); - for (i = 0; i < stats->max_states; i++) { - if (len >= PAGE_SIZE) - break; - len += snprintf(buf + len, PAGE_SIZE - len, "state%2u ", i); - } - if (len >= PAGE_SIZE) - return PAGE_SIZE; + spin_lock(&stats->lock); + + ret = kstrtoul(buf, 10, &state); + if (ret || (state > stats->max_states)) + goto unlock; - len += snprintf(buf + len, PAGE_SIZE - len, "\n"); + stats->show_state = state; +unlock: + spin_unlock(&stats->lock); - for (i = 0; i < stats->max_states; i++) { - if (len >= PAGE_SIZE) - break; + return count; +} + +static ssize_t +show_state_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct thermal_cooling_device *cdev = to_cooling_device(dev); + struct cooling_dev_stats *stats = cdev->stats; + + return sprintf(buf, "%lu\n", stats->show_state); +} - len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i); +/* find the kth largest in nums array*/ +static int find_show_state(int *nums, int numsSize, int k, unsigned int *max_value) +{ + int i, l, r, mid, cnt = 0, min = INT_MAX, max = 0; - for (j = 0; j < stats->max_states; j++) { - if (len >= PAGE_SIZE) - break; - len += snprintf(buf + len, PAGE_SIZE - len, "%8u ", - stats->trans_table[i * stats->max_states + j]); + for (i = 0; i < numsSize; i++) { + min = nums[i] < min ? nums[i] : min; + max = nums[i] > max ? nums[i] : max; + } + l = min; + r = max; + while (l < r) { + mid = r - (r - l) / 2; + for (i = 0; i < numsSize; i++) { + if (nums[i] >= mid) + cnt++; + } + if (cnt < k) { + r = mid - 1; + cnt = 0; + } else { + l = mid; + cnt = 0; } + } + + *max_value = max; + + return l; +} + + + +static ssize_t trans_table_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct thermal_cooling_device *cdev = to_cooling_device(dev); + struct cooling_dev_stats *stats = cdev->stats; + unsigned int show_state_value = 0; + unsigned int max_state_value = 0; + ssize_t len = 0; + int i, j; + + len += snprintf(buf + len, PAGE_SIZE - len, " From : Index_change\n"); + for (i = 0; i < stats->max_states; i++) { + show_state_value = find_show_state(&stats->trans_table[i * stats->max_states], + stats->max_states, stats->show_state, &max_state_value); + if (max_state_value) + len += snprintf(buf + len, PAGE_SIZE - len, "state%2u:", i); + else + continue; + for (j = 0; j < stats->max_states; j++) + if (stats->trans_table[i * stats->max_states + j] && (show_state_value <= + stats->trans_table[i * stats->max_states + j])) + len += snprintf(buf + len, PAGE_SIZE - len, " ->%u(%u)", j, + stats->trans_table[i * stats->max_states + j]); if (len >= PAGE_SIZE) break; len += snprintf(buf + len, PAGE_SIZE - len, "\n"); @@ -793,6 +849,7 @@ static ssize_t trans_table_show(struct device *dev, pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n"); return -EFBIG; } + return len; } @@ -800,12 +857,14 @@ static DEVICE_ATTR_RO(total_trans); static DEVICE_ATTR_RO(time_in_state_ms); static DEVICE_ATTR_WO(reset); static DEVICE_ATTR_RO(trans_table); +static DEVICE_ATTR_RW(show_state); static struct attribute *cooling_device_stats_attrs[] = { &dev_attr_total_trans.attr, &dev_attr_time_in_state_ms.attr, &dev_attr_reset.attr, &dev_attr_trans_table.attr, + &dev_attr_show_state.attr, NULL }; @@ -829,7 +888,7 @@ static void cooling_device_stats_setup(struct thermal_cooling_device *cdev) var += sizeof(*stats->time_in_state) * states; var += sizeof(*stats->trans_table) * states * states; - stats = kzalloc(var, GFP_KERNEL); + stats = kvzalloc(var, GFP_KERNEL); if (!stats) return; @@ -838,6 +897,8 @@ static void cooling_device_stats_setup(struct thermal_cooling_device *cdev) cdev->stats = stats; stats->last_time = ktime_get(); stats->max_states = states; + /* default set show_state = max_states/2 */ + stats->show_state = states / 2; spin_lock_init(&stats->lock); @@ -848,7 +909,7 @@ static void cooling_device_stats_setup(struct thermal_cooling_device *cdev) static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev) { - kfree(cdev->stats); + kvfree(cdev->stats); cdev->stats = NULL; } -- 2.25.1
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