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sched/note: Move the circle buffer code to driver

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so the format code can be shared by different transport

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao
2020-08-07 02:57:30 +08:00
committed by liuguo09
parent f99719e260
commit 952af92690
20 changed files with 540 additions and 456 deletions
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drivers/note/Kconfig
+29 -2
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@@ -8,10 +8,37 @@ menu "Note Driver Support"
config DRIVER_NOTE
bool "Scheduler instrumentation driver"
default n
depends on SCHED_INSTRUMENTATION_BUFFER && SCHED_NOTE_GET
depends on !SCHED_INSTRUMENTATION_CSECTION && (!SCHED_INSTRUMENTATION_SPINLOCK || !SMP)
---help---
Enable building a serial driver that can be used by an application
If this option is selected, then in-memory buffering logic is
enabled to capture scheduler instrumentation data. This has
the advantage that (1) the platform logic does not have to provide
the sched_note_* interfaces described for the previous settings.
Instead, the buffering logic catches all of these. It encodes
timestamps the scheduler note and adds the note to an in-memory,
circular buffer. And (2) buffering the scheduler instrumentation
data (versus performing some output operation) minimizes the impact
of the instrumentation on the behavior of the system. If the in-memory
buffer becomes full, then older notes are overwritten by newer notes.
A character driver is provided which can be used by an application
to read data from the in-memory, scheduler instrumentation "note"
buffer.
NOTE: This option is not available if critical sections are being
monitor (nor if spinlocks are being monitored in SMP configuration)
because there would be a logical error in the design in those cases.
That error is that these interfaces call enter_ and leave_critical_section
(and which us spinlocks in SMP mode). That means that each call to
sched_note_get() causes several additional entries to be added from
the note buffer in order to remove one entry.
config SCHED_NOTE_BUFSIZE
int "Instrumentation buffer size"
depends on DRIVER_NOTE
default 2048
---help---
The size of the in-memory, circular instrumentation buffer (in
bytes).
endmenu