linux/include
Steven Rostedt 8789a9e7df ring-buffer: read page interface
Impact: new API to ring buffer

This patch adds a new interface into the ring buffer that allows a
page to be read from the ring buffer on a given CPU. For every page
read, one must also be given to allow for a "swap" of the pages.

 rpage = ring_buffer_alloc_read_page(buffer);
 if (!rpage)
	goto err;
 ret = ring_buffer_read_page(buffer, &rpage, cpu, full);
 if (!ret)
	goto empty;
 process_page(rpage);
 ring_buffer_free_read_page(rpage);

The caller of these functions must handle any waits that are
needed to wait for new data. The ring_buffer_read_page will simply
return 0 if there is no data, or if "full" is set and the writer
is still on the current page.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-12-03 08:56:21 +01:00
..
acpi ACPICA: disable _BIF warning 2008-11-27 02:17:30 -05:00
asm-arm
asm-frv
asm-generic trace: profile all if conditionals 2008-11-23 11:41:01 +01:00
asm-h8300
asm-m32r
asm-m68k proc: move /proc/hardware to m68k-specific code 2008-10-23 14:24:03 +04:00
asm-mn10300
asm-xtensa Merge git://git.kernel.org/pub/scm/linux/kernel/git/czankel/xtensa-2.6 2008-10-23 09:16:56 -07:00
crypto
drm drm: move drm vblank initialization/cleanup to driver load/unload 2008-11-25 09:49:03 +10:00
keys
linux ring-buffer: read page interface 2008-12-03 08:56:21 +01:00
math-emu math-emu: Fix thinko in _FP_DIV 2008-10-22 22:09:59 -07:00
media V4L/DVB (9335): videobuf: split unregister bus creating self-contained frontend de-allocator 2008-10-21 14:32:08 -02:00
mtd
net mac80211: remove ieee80211_notify_mac 2008-11-18 17:26:26 -05:00
pcmcia
rdma
rxrpc
scsi scsi: make sure that scsi_init_shared_tag_map() doesn't overwrite existing map 2008-10-27 19:25:30 +01:00
sound Merge branches 'topic/fix/misc' and 'topic/fix/hda' into for-linus 2008-11-10 17:58:46 +01:00
trace blktrace: port to tracepoints, update 2008-11-26 13:04:35 +01:00
video atmel_lcdfb: change irq_base definition to allow error reporting 2008-11-12 17:17:16 -08:00
xen
Kbuild