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tick: Split nohz and highres features from nohz_mode

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The nohz mode field tells about low resolution nohz mode or high
resolution nohz mode but it doesn't tell about high resolution non-nohz
mode.

In order to retrieve the latter state, tick_cancel_sched_timer() must
fiddle with struct hrtimer's internals to guess if the tick has been
initialized in high resolution.

Move instead the nohz mode field information into the tick flags and
provide two new bits: one to know if the tick is in nohz mode and
another one to know if the tick is in high resolution. The combination
of those two flags provides all the needed informations to determine
which of the three tick modes is running.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240225225508.11587-14-frederic@kernel.org
This commit is contained in:
Frederic Weisbecker
2024-02-25 23:55:05 +01:00
committed by Thomas Gleixner
parent a478ffb2ae
commit 7988e5ae2b
4 changed files with 26 additions and 26 deletions
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kernel/time/timer_list.c
+3 -2
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@@ -152,7 +152,8 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
{
struct tick_sched *ts = tick_get_tick_sched(cpu);
P(nohz_mode);
P_flag(nohz, TS_FLAG_NOHZ);
P_flag(highres, TS_FLAG_HIGHRES);
P_ns(last_tick);
P_flag(tick_stopped, TS_FLAG_STOPPED);
P(idle_jiffies);
@@ -259,7 +260,7 @@ static void timer_list_show_tickdevices_header(struct seq_file *m)
static inline void timer_list_header(struct seq_file *m, u64 now)
{
SEQ_printf(m, "Timer List Version: v0.9\n");
SEQ_printf(m, "Timer List Version: v0.10\n");
SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);
SEQ_printf(m, "\n");