On Mon, Oct 05 2020 at 07:27 -0600, Rafael J. Wysocki wrote:
On Sat, Oct 3, 2020 at 5:56 PM Lina Iyer <ilina@xxxxxxxxxxxxxx> wrote:To enable better debug of PM domains, let's keep a track of the success and rejections in entering each domain idle state. This statistics is exported in debugfs when reading the idle_states node, associated with each PM domain. Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx> --- Changes in v2: - Renamed 'failed' to 'rejected' This patch depends-on: https://lkml.org/lkml/2020/9/24/465 --- drivers/base/power/domain.c | 7 +++++-- include/linux/pm_domain.h | 2 ++ 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index f001ac6326fb..dbe89454f594 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -564,6 +564,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, genpd->status = GENPD_STATE_OFF; genpd_update_accounting(genpd); + genpd->states[genpd->state_idx].usage++;Why not to do this in genpd_update_accounting()?
That function is clubbed with debugfs and does heavy tracking using timers. This accounting is fairly basic and still quite useful for debugging.
list_for_each_entry(link, &genpd->child_links, child_node) { genpd_sd_counter_dec(link->parent); @@ -574,6 +575,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, return 0; busy: + genpd->states[genpd->state_idx].rejected++; if (nr_calls) __raw_notifier_call_chain(&genpd->power_notifiers, GENPD_STATE_ON, NULL,This doesn't apply to the current code, please rebase.
I believe it applies cleanly on top of https://lkml.org/lkml/2020/9/24/465, which I believe you are applied to your tree. Let me rebase and re-post. Sorry about that. Thanks, Lina
@@ -3053,7 +3055,7 @@ static int idle_states_show(struct seq_file *s, void *data) if (ret) return -ERESTARTSYS; - seq_puts(s, "State Time Spent(ms)\n"); + seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); for (i = 0; i < genpd->state_count; i++) { ktime_t delta = 0; @@ -3065,7 +3067,8 @@ static int idle_states_show(struct seq_file *s, void *data) msecs = ktime_to_ms( ktime_add(genpd->states[i].idle_time, delta)); - seq_printf(s, "S%-13i %lld\n", i, msecs); + seq_printf(s, "S%-13i %-14lld %-14llu %llu\n", i, msecs, + genpd->states[i].usage, genpd->states[i].rejected); } genpd_unlock(genpd); diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 3b2b561ce846..239647f2d27f 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -82,6 +82,8 @@ struct genpd_power_state { s64 power_off_latency_ns; s64 power_on_latency_ns; s64 residency_ns; + u64 usage; + u64 rejected; struct fwnode_handle *fwnode; ktime_t idle_time; void *data; -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
