linux-toradex.git/include/linux/srcutiny.h, branch v4.13-rc4

srcu: Apply trivial callback lists to shrink Tiny SRCU

2017-06-09T01:52:35+00:00

The rcu_segcblist structure provides quite a bit of functionality, and
Tiny SRCU needs almost none of it.  So this commit replaces Tiny SRCU's
uses of rcu_segcblist with a simple singly linked list with tail pointer.
This change significantly reduces Tiny SRCU's memory footprint, more
than making up for the growth caused by the creation of rcu_segcblist.c

Signed-off-by: Paul E. McKenney

srcu: Shrink srcu.h by moving docbook and private function

2017-06-09T01:52:35+00:00

The call_srcu() docbook entry is currently in include/linux/srcu.h,
which causes needless processing for each include point.  This commit
therefore moves this entry to kernel/rcu/srcutree.c, which the compiler
reads only once.  In addition, the srcu_batches_completed() function is
used only within RCU and its torture-test suites.  This commit therefore
also moves this function's declaration from include/linux/srcutiny.h,
include/linux/srcutree.h, and include/linux/srcuclassic.h to
kernel/rcu/rcu.h.

Signed-off-by: Paul E. McKenney

rcu: Move torture-related definitions from rcupdate.h to rcu.h

2017-06-09T01:52:28+00:00

The include/linux/rcupdate.h file contains a number of definitions that
are used only to communicate between rcutorture, rcuperf, and the RCU code
itself.  There is no point in having these definitions exposed globally
throughout the kernel, so this commit moves them to kernel/rcu/rcu.h.
This change has the added benefit of shrinking rcupdate.h.

Reported-by: Ingo Molnar 
Signed-off-by: Paul E. McKenney

srcu: Shrink Tiny SRCU a bit

2017-06-08T15:25:38+00:00

In Tiny SRCU, __srcu_read_lock() is a trivial function, outweighed by
its EXPORT_SYMBOL_GPL(), and on many architectures, its call sequence.
This commit therefore moves it to srcutiny.h so that it can be inlined.

Signed-off-by: Paul E. McKenney

srcu: Shrink Tiny SRCU a bit more

2017-06-08T15:25:31+00:00

This commit rearranges Tiny SRCU's srcu_struct structure, substitutes
u8 for bool, and shrinks counters down to short.

Signed-off-by: Paul E. McKenney

srcu: Make rcutorture writer stalls print SRCU GP state

2017-04-26T18:23:28+00:00

In the past, SRCU was simple enough that there was little point in
making the rcutorture writer stall messages print the SRCU grace-period
number state.  With the advent of Tree SRCU, this has changed.  This
commit therefore makes Classic, Tiny, and Tree SRCU report this state
to rcutorture as needed.

Signed-off-by: Paul E. McKenney 
Tested-by: Mike Galbraith

srcu: Create a tiny SRCU

2017-04-18T18:38:22+00:00

In response to automated complaints about modifications to SRCU
increasing its size, this commit creates a tiny SRCU that is
used in SMP=n && PREEMPT=n builds.

Signed-off-by: Paul E. McKenney