task->mm remains null in 'context_switch()'

[Sukanto Ghosh <sukanto.cse.iitb@xxxxxxxxx>]

Hi,

I was adding a field to the 3 trace_mark() calls in kernel/sched.c.
The calls are at: i) context_switch(prev, next, ... )  ii)
try_to_wake_up(p, ...)  iii) wake_up_new_task(p, ...)  functions

The field is 'task'->mm->pfrate. (I have added the pfrate field in
mm_struct), where 'task' is a placeholder for prev/next/p/rq->curr in
those trace_mark() calls.  I found that always either the next/p
pointers are NULL or task->mm is NULL at that particular point.  Is it
supposed to be so ? Why ?

PS: The trace_mark() in kernel/sched.c calls are for adding entries to
the trace-file of sched_switch tracer.


-- 
Regards,
Sukanto Ghosh

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