Revision 7f453c24b95a085fc7bd35d53b33abc4dc5a048b authored by Peter Zijlstra on 21 July 2009, 11:19:40 UTC, committed by Peter Zijlstra on 22 July 2009, 16:05:56 UTC
Anton noted that for inherited counters the counter-id as provided by PERF_SAMPLE_ID isn't mappable to the id found through PERF_RECORD_ID because each inherited counter gets its own id. His suggestion was to always return the parent counter id, since that is the primary counter id as exposed. However, these inherited counters have a unique identifier so that events like PERF_EVENT_PERIOD and PERF_EVENT_THROTTLE can be specific about which counter gets modified, which is important when trying to normalize the sample streams. This patch removes PERF_EVENT_PERIOD in favour of PERF_SAMPLE_PERIOD, which is more useful anyway, since changing periods became a lot more common than initially thought -- rendering PERF_EVENT_PERIOD the less useful solution (also, PERF_SAMPLE_PERIOD reports the more accurate value, since it reports the value used to trigger the overflow, whereas PERF_EVENT_PERIOD simply reports the requested period changed, which might only take effect on the next cycle). This still leaves us PERF_EVENT_THROTTLE to consider, but since that _should_ be a rare occurrence, and linking it to a primary id is the most useful bit to diagnose the problem, we introduce a PERF_SAMPLE_STREAM_ID, for those few cases where the full reconstruction is important. [Does change the ABI a little, but I see no other way out] Suggested-by: Anton Blanchard <anton@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1248095846.15751.8781.camel@twins>
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00-INDEX
Index of files in Documentation/fb. If you think something about frame
buffer devices needs an entry here, needs correction or you've written one
please mail me.
Geert Uytterhoeven <geert@linux-m68k.org>
00-INDEX
- this file
arkfb.txt
- info on the fbdev driver for ARK Logic chips.
aty128fb.txt
- info on the ATI Rage128 frame buffer driver.
cirrusfb.txt
- info on the driver for Cirrus Logic chipsets.
deferred_io.txt
- an introduction to deferred IO.
fbcon.txt
- intro to and usage guide for the framebuffer console (fbcon).
framebuffer.txt
- introduction to frame buffer devices.
imacfb.txt
- info on the generic EFI platform driver for Intel based Macs.
intel810.txt
- documentation for the Intel 810/815 framebuffer driver.
intelfb.txt
- docs for Intel 830M/845G/852GM/855GM/865G/915G/945G fb driver.
internals.txt
- quick overview of frame buffer device internals.
matroxfb.txt
- info on the Matrox framebuffer driver for Alpha, Intel and PPC.
modedb.txt
- info on the video mode database.
matroxfb.txt
- info on the Matrox frame buffer driver.
pvr2fb.txt
- info on the PowerVR 2 frame buffer driver.
pxafb.txt
- info on the driver for the PXA25x LCD controller.
s3fb.txt
- info on the fbdev driver for S3 Trio/Virge chips.
sa1100fb.txt
- information about the driver for the SA-1100 LCD controller.
sisfb.txt
- info on the framebuffer device driver for various SiS chips.
sstfb.txt
- info on the frame buffer driver for 3dfx' Voodoo Graphics boards.
tgafb.txt
- info on the TGA (DECChip 21030) frame buffer driver
vesafb.txt
- info on the VESA frame buffer device
vt8623fb.txt
- info on the fb driver for the graphics core in VIA VT8623 chipsets.
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