diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/block/drbd/drbd_nl.c | 6 | ||||
-rw-r--r-- | drivers/cpufreq/cpufreq_governor.c | 10 | ||||
-rw-r--r-- | drivers/cpufreq/cpufreq_governor.h | 1 | ||||
-rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 39 | ||||
-rw-r--r-- | drivers/cpufreq/cpufreq_stats.c | 2 | ||||
-rw-r--r-- | drivers/md/raid5.c | 18 | ||||
-rw-r--r-- | drivers/media/v4l2-core/videobuf2-core.c | 15 |
7 files changed, 45 insertions, 46 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 9e3f441e7e84..9c37f3d896a2 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -514,6 +514,12 @@ void conn_try_outdate_peer_async(struct drbd_tconn *tconn) struct task_struct *opa; kref_get(&tconn->kref); + /* We may just have force_sig()'ed this thread + * to get it out of some blocking network function. + * Clear signals; otherwise kthread_run(), which internally uses + * wait_on_completion_killable(), will mistake our pending signal + * for a new fatal signal and fail. */ + flush_signals(current); opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h"); if (IS_ERR(opa)) { conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n"); diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index 28a0b32c73b3..27b0e2a295ea 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -97,7 +97,7 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu) policy = cdbs->cur_policy; - /* Get Absolute Load (in terms of freq for ondemand gov) */ + /* Get Absolute Load */ for_each_cpu(j, policy->cpus) { struct cpu_dbs_common_info *j_cdbs; u64 cur_wall_time, cur_idle_time; @@ -148,14 +148,6 @@ void dbs_check_cpu(struct dbs_data *dbs_data, int cpu) load = 100 * (wall_time - idle_time) / wall_time; - if (dbs_data->cdata->governor == GOV_ONDEMAND) { - int freq_avg = __cpufreq_driver_getavg(policy, j); - if (freq_avg <= 0) - freq_avg = policy->cur; - - load *= freq_avg; - } - if (load > max_load) max_load = load; } diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h index 0d9e6befe1d5..4a9058aeb57e 100644 --- a/drivers/cpufreq/cpufreq_governor.h +++ b/drivers/cpufreq/cpufreq_governor.h @@ -169,7 +169,6 @@ struct od_dbs_tuners { unsigned int sampling_rate; unsigned int sampling_down_factor; unsigned int up_threshold; - unsigned int adj_up_threshold; unsigned int powersave_bias; unsigned int io_is_busy; }; diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index c087347d6688..25438bbf96bb 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -29,11 +29,9 @@ #include "cpufreq_governor.h" /* On-demand governor macros */ -#define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) #define DEF_FREQUENCY_UP_THRESHOLD (80) #define DEF_SAMPLING_DOWN_FACTOR (1) #define MAX_SAMPLING_DOWN_FACTOR (100000) -#define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3) #define MICRO_FREQUENCY_UP_THRESHOLD (95) #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) #define MIN_FREQUENCY_UP_THRESHOLD (11) @@ -161,14 +159,10 @@ static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) /* * Every sampling_rate, we check, if current idle time is less than 20% - * (default), then we try to increase frequency. Every sampling_rate, we look - * for the lowest frequency which can sustain the load while keeping idle time - * over 30%. If such a frequency exist, we try to decrease to this frequency. - * - * Any frequency increase takes it to the maximum frequency. Frequency reduction - * happens at minimum steps of 5% (default) of current frequency + * (default), then we try to increase frequency. Else, we adjust the frequency + * proportional to load. */ -static void od_check_cpu(int cpu, unsigned int load_freq) +static void od_check_cpu(int cpu, unsigned int load) { struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy; @@ -178,29 +172,17 @@ static void od_check_cpu(int cpu, unsigned int load_freq) dbs_info->freq_lo = 0; /* Check for frequency increase */ - if (load_freq > od_tuners->up_threshold * policy->cur) { + if (load > od_tuners->up_threshold) { /* If switching to max speed, apply sampling_down_factor */ if (policy->cur < policy->max) dbs_info->rate_mult = od_tuners->sampling_down_factor; dbs_freq_increase(policy, policy->max); return; - } - - /* Check for frequency decrease */ - /* if we cannot reduce the frequency anymore, break out early */ - if (policy->cur == policy->min) - return; - - /* - * The optimal frequency is the frequency that is the lowest that can - * support the current CPU usage without triggering the up policy. To be - * safe, we focus 10 points under the threshold. - */ - if (load_freq < od_tuners->adj_up_threshold - * policy->cur) { + } else { + /* Calculate the next frequency proportional to load */ unsigned int freq_next; - freq_next = load_freq / od_tuners->adj_up_threshold; + freq_next = load * policy->cpuinfo.max_freq / 100; /* No longer fully busy, reset rate_mult */ dbs_info->rate_mult = 1; @@ -374,9 +356,6 @@ static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, input < MIN_FREQUENCY_UP_THRESHOLD) { return -EINVAL; } - /* Calculate the new adj_up_threshold */ - od_tuners->adj_up_threshold += input; - od_tuners->adj_up_threshold -= od_tuners->up_threshold; od_tuners->up_threshold = input; return count; @@ -525,8 +504,6 @@ static int od_init(struct dbs_data *dbs_data) if (idle_time != -1ULL) { /* Idle micro accounting is supported. Use finer thresholds */ tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; - tuners->adj_up_threshold = MICRO_FREQUENCY_UP_THRESHOLD - - MICRO_FREQUENCY_DOWN_DIFFERENTIAL; /* * In nohz/micro accounting case we set the minimum frequency * not depending on HZ, but fixed (very low). The deferred @@ -535,8 +512,6 @@ static int od_init(struct dbs_data *dbs_data) dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; } else { tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; - tuners->adj_up_threshold = DEF_FREQUENCY_UP_THRESHOLD - - DEF_FREQUENCY_DOWN_DIFFERENTIAL; /* For correct statistics, we need 10 ticks for each measure */ dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index 66733f1d55d4..9823037f194b 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -84,7 +84,7 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf) for (i = 0; i < stat->state_num; i++) { len += sprintf(buf + len, "%u %llu\n", stat->freq_table[i], (unsigned long long) - cputime64_to_clock_t(stat->time_in_state[i])); + jiffies_64_to_clock_t(stat->time_in_state[i])); } return len; } diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 774f81423d78..2332b5ced0dd 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -60,6 +60,10 @@ #include "raid0.h" #include "bitmap.h" +static bool devices_handle_discard_safely = false; +module_param(devices_handle_discard_safely, bool, 0644); +MODULE_PARM_DESC(devices_handle_discard_safely, + "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); /* * Stripe cache */ @@ -5611,7 +5615,7 @@ static int run(struct mddev *mddev) mddev->queue->limits.discard_granularity = stripe; /* * unaligned part of discard request will be ignored, so can't - * guarantee discard_zerors_data + * guarantee discard_zeroes_data */ mddev->queue->limits.discard_zeroes_data = 0; @@ -5636,6 +5640,18 @@ static int run(struct mddev *mddev) !bdev_get_queue(rdev->bdev)-> limits.discard_zeroes_data) discard_supported = false; + /* Unfortunately, discard_zeroes_data is not currently + * a guarantee - just a hint. So we only allow DISCARD + * if the sysadmin has confirmed that only safe devices + * are in use by setting a module parameter. + */ + if (!devices_handle_discard_safely) { + if (discard_supported) { + pr_info("md/raid456: discard support disabled due to uncertainty.\n"); + pr_info("Set raid456.devices_handle_discard_safely=Y to override.\n"); + } + discard_supported = false; + } } if (discard_supported && diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index e3bdc3be91e1..5e47ba479e53 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -666,6 +666,7 @@ static int __reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) * to the userspace. */ req->count = allocated_buffers; + q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); return 0; } @@ -714,6 +715,7 @@ static int __create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create memset(q->plane_sizes, 0, sizeof(q->plane_sizes)); memset(q->alloc_ctx, 0, sizeof(q->alloc_ctx)); q->memory = create->memory; + q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); } num_buffers = min(create->count, VIDEO_MAX_FRAME - q->num_buffers); @@ -1355,6 +1357,7 @@ int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b) * dequeued in dqbuf. */ list_add_tail(&vb->queued_entry, &q->queued_list); + q->waiting_for_buffers = false; vb->state = VB2_BUF_STATE_QUEUED; /* @@ -1724,6 +1727,7 @@ int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) * and videobuf, effectively returning control over them to userspace. */ __vb2_queue_cancel(q); + q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); dprintk(3, "Streamoff successful\n"); return 0; @@ -2009,9 +2013,16 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) } /* - * There is nothing to wait for if no buffers have already been queued. + * There is nothing to wait for if the queue isn't streaming. */ - if (list_empty(&q->queued_list)) + if (!vb2_is_streaming(q)) + return res | POLLERR; + /* + * For compatibility with vb1: if QBUF hasn't been called yet, then + * return POLLERR as well. This only affects capture queues, output + * queues will always initialize waiting_for_buffers to false. + */ + if (q->waiting_for_buffers) return res | POLLERR; if (list_empty(&q->done_list)) |