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bootstage: Add time accumulation feature

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Sometimes we want to add up the amount of time spent in a particular
activity when it is happening in a number of discrete chunks.

Add bootstage_start() to mark the start of an acitivity and
bootstage_accum() to accumulate the time since the last start. Calling
these function in pairs results in the accumulated time being collected.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2012-09-28 08:56:36 +00:00
committed by Anatolij Gustschin
parent 094e06a523
commit 0e99677358
2 changed files with 60 additions and 3 deletions
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27
include/bootstage.h
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@ -247,6 +247,33 @@ ulong bootstage_error(enum bootstage_id id);
ulong bootstage_mark_name(enum bootstage_id id, const char *name);
/**
* Mark the start of a bootstage activity. The end will be marked later with
* bootstage_accum() and at that point we accumulate the time taken. Calling
* this function turns the given id into a accumulator rather than and
* absolute mark in time. Accumulators record the total amount of time spent
* in an activty during boot.
*
* @param id Bootstage id to record this timestamp against
* @param name Textual name to display for this id in the report (maybe NULL)
* @return start timestamp in microseconds
*/
uint32_t bootstage_start(enum bootstage_id id, const char *name);
/**
* Mark the end of a bootstage activity
*
* After previously marking the start of an activity with bootstage_start(),
* call this function to mark the end. You can call these functions in pairs
* as many times as you like.
*
* @param id Bootstage id to record this timestamp against
* @return time spent in this iteration of the activity (i.e. the time now
* less the start time recorded in the last bootstage_start() call
* with this id.
*/
uint32_t bootstage_accum(enum bootstage_id id);
/* Print a report about boot time */
void bootstage_report(void);