linux/include
Steven Rostedt d769041f86 ring_buffer: implement new locking
The old "lock always" scheme had issues with lockdep, and was not very
efficient anyways.

This patch does a new design to be partially lockless on writes.
Writes will add new entries to the per cpu pages by simply disabling
interrupts. When a write needs to go to another page than it will
grab the lock.

A new "read page" has been added so that the reader can pull out a page
from the ring buffer to read without worrying about the writer writing over
it. This allows us to not take the lock for all reads. The lock is
now only taken when a read needs to go to a new page.

This is far from lockless, and interrupts still need to be disabled,
but it is a step towards a more lockless solution, and it also
solves a lot of the issues that were noticed by the first conversion
of ftrace to the ring buffers.

Note: the ring_buffer_{un}lock API has been removed.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-14 10:39:05 +02:00
..
acpi
asm-arm
asm-cris
asm-frv
asm-generic ftrace: create __mcount_loc section 2008-10-14 10:34:40 +02:00
asm-m32r
asm-m68k
asm-mips MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
asm-mn10300
asm-parisc
asm-um
asm-x86 ftrace: mcount call site on boot nops core 2008-10-14 10:34:44 +02:00
asm-xtensa
crypto
drm
keys
linux ring_buffer: implement new locking 2008-10-14 10:39:05 +02:00
math-emu
media
mtd
net net: fix dummy 'nf_conntrack_event_cache()' 2008-10-11 09:46:24 -07:00
pcmcia
rdma
rxrpc
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-10 10:53:26 -07:00
sound Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 2008-10-11 12:39:35 -07:00
trace sched: clean up tracepoints 2008-10-14 10:33:14 +02:00
video Merge branch 'pxa-all' into devel 2008-10-09 21:33:02 +01:00
xen xen: remove unused balloon.h 2008-10-03 10:04:10 +02:00
Kbuild