10 Mar, 2011
1 commit
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Add an "overwrite" trace_option for ftrace to control whether the buffer should
be overwritten on overflow or not. The default remains to overwrite old events
when the buffer is full. This patch adds the option to instead discard newest
events when the buffer is full. This is useful to get a snapshot of traces just
after enabling traces. Dropping the current event is also a simpler code path.Signed-off-by: David Sharp
LKML-Reference:
Signed-off-by: Steven Rostedt
09 Mar, 2011
3 commits
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You can crash the kernel (with root/admin privileges) using kprobe tracer by running:
echo "p system_call_after_swapgs" > ./kprobe_events
echo 1 > ./events/kprobes/enableThe reason is that at the system_call_after_swapgs label, the
kernel stack is not set up. If optimized kprobes are enabled,
the user space stack is being used in this case (see optimized
kprobe template) and this might result in a crash.There are several places like this over the entry code
(entry_$BIT). As it seems there's no any reasonable/maintainable
way to disable only those places where the stack is not ready, I
switched off the whole entry code from kprobe optimizing.Signed-off-by: Jiri Olsa
Acked-by: Masami Hiramatsu
Cc: acme@redhat.com
Cc: fweisbec@gmail.com
Cc: ananth@in.ibm.com
Cc: davem@davemloft.net
Cc: a.p.zijlstra@chello.nl
Cc: eric.dumazet@gmail.com
Cc: 2nddept-manager@sdl.hitachi.co.jp
LKML-Reference:
Signed-off-by: Ingo Molnar -
Put x86 entry code into a separate link section: .entry.text.
Separating the entry text section seems to have performance
benefits - caused by more efficient instruction cache usage.Running hackbench with perf stat --repeat showed that the change
compresses the icache footprint. The icache load miss rate went
down by about 15%:before patch:
19417627 L1-icache-load-misses ( +- 0.147% )after patch:
16490788 L1-icache-load-misses ( +- 0.180% )The motivation of the patch was to fix a particular kprobes
bug that relates to the entry text section, the performance
advantage was discovered accidentally.Whole perf output follows:
- results for current tip tree:
Performance counter stats for './hackbench/hackbench 10' (500 runs):
19417627 L1-icache-load-misses ( +- 0.147% )
2676914223 instructions # 0.497 IPC ( +- 0.079% )
5389516026 cycles ( +- 0.144% )0.206267711 seconds time elapsed ( +- 0.138% )
- results for current tip tree with the patch applied:
Performance counter stats for './hackbench/hackbench 10' (500 runs):
16490788 L1-icache-load-misses ( +- 0.180% )
2717734941 instructions # 0.502 IPC ( +- 0.079% )
5414756975 cycles ( +- 0.148% )0.206747566 seconds time elapsed ( +- 0.137% )
Signed-off-by: Jiri Olsa
Cc: Arnaldo Carvalho de Melo
Cc: Frederic Weisbecker
Cc: Peter Zijlstra
Cc: Linus Torvalds
Cc: Andrew Morton
Cc: Nick Piggin
Cc: Eric Dumazet
Cc: masami.hiramatsu.pt@hitachi.com
Cc: ananth@in.ibm.com
Cc: davem@davemloft.net
Cc: 2nddept-manager@sdl.hitachi.co.jp
LKML-Reference:
Signed-off-by: Ingo Molnar -
Merge reason: Merge latest fixes.
Signed-off-by: Ingo Molnar
08 Mar, 2011
12 commits
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…git/kgene/linux-samsung
* 's5p-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung:
ARM: S3C64XX: Update regulator names for debugfs compatiblity on SMDK6410
ARM: S3C64XX: Fix build with WM1190 disabled and WM1192 enabled on SMDK6410
ARM: S3C64XX: Reduce output of s3c64xx_dma_init1()
ARM: S3C64XX: Tone down SDHCI debugging
ARM: S3C64XX: Add clock for i2c1
ARM: S3C64XX: Staticise non-exported GPIO to interrupt functions
ARM: SAMSUNG: Include devs.h in dev-uart.c to prototype devices
ARM: S3C64XX: Fix keypad setup to configure correct number of rows
ARM: S3C2440: Fix usage gpio bank j pin definitions on GTA02
ARM: S5P64X0: Fix number of GPIO lines in Bank F
ARM: S3C2440: Select missing S3C_DEV_USB_HOST on GTA02 -
* 'fixes' of master.kernel.org:/home/rmk/linux-2.6-arm:
davinci: cpufreq: fix section mismatch warning
DaVinci: fix compilation warnings in
davinci: tnetv107x: fix register indexing for GPIOs numbers > 31
davinci: da8xx/omap-l1x: add platform device for davinci-pcm-audio
ARM: pxa/tosa: register wm9712 codec device
ARM: pxa: enable pxa-pcm-audio on pxa210/pxa25x platform
ARM: pxa/colibri: don't register pxa2xx-pcmcia nodes on non-colibri platforms
ARM: pxa/tosa: drop setting LED trigger name, as it's unsupported now
ARM: 6762/1: Update number of VIC for S5P6442 and S5PC100
ARM: 6761/1: Update number of VIC for S5PV210
ARM: 6768/1: hw_breakpoint: ensure debug logic is powered up on v7 cores
ARM: 6767/1: ptrace: fix register indexing in GETHBPREGS request
ARM: 6765/1: remove obsolete comment from asm/mach/arch.h
ARM: 6757/1: fix tlb.h induced linux/swap.h build failure -
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc:
mmc: sdio: Allow sdio operations in other threads during sdio_add_func() -
* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
drm: index i shadowed in 2nd loop
drm/nv50-nvc0: prevent multiple vm/bar flushes occuring simultanenously
drm/nouveau: fix regression causing ttm to not be able to evict vram
drm/i915: Rebind the buffer if its alignment constraints changes with tiling
drm/i915: Disable GPU semaphores by default
drm/i915: Do not overflow the MMADDR write FIFO
Revert "drm/i915: fix corruptions on i8xx due to relaxed fencing" -
Index i was already used in thhe first loop
Signed-off-by: Roel Kluin
Signed-off-by: Dave Airlie -
This fixes a bug introduced by 807e8e40673d ("mmc: Fix sd/sdio/mmc
initialization frequency retries") that prevented SDIO drivers from
performing SDIO commands in their probe routines -- the above patch
called mmc_claim_host() before sdio_add_func(), which causes a deadlock
if an external SDIO driver calls sdio_claim_host().Fix tested on an OLPC XO-1.75 with libertas on SDIO.
Signed-off-by: Dmitry Shmidt
Reviewed-and-Tested-by: Chris Ball
Signed-off-by: Chris Ball -
* ickle/drm-intel-fixes:
drm/i915: Rebind the buffer if its alignment constraints changes with tiling
drm/i915: Disable GPU semaphores by default
drm/i915: Do not overflow the MMADDR write FIFO
Revert "drm/i915: fix corruptions on i8xx due to relaxed fencing" -
…/git/tmlind/linux-omap-2.6
* 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6:
omap: mailbox: resolve hang issue
OMAP2+: PM: SmartReflex: fix memory leaks in Smartreflex driver
arm: mach-omap2: smartreflex: fix another memory leak -
* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
[S390] tape: deadlock on system work queue
[S390] keyboard: integer underflow bug
[S390] xpram: remove __initdata attribute from module parameters -
The per-vm mutex doesn't prevent this completely, a flush coming from the
BAR VM could potentially happen at the same time as one for the channel
VM. Not to mention that if/when we get per-client/channel VM, this will
happen far more frequently.Signed-off-by: Ben Skeggs
Signed-off-by: Dave Airlie -
TTM assumes an error condition from man->func->get_node() means that
something went horribly wrong, and causes it to bail.The driver is supposed to return 0, and leave mm_node == NULL to
signal that it couldn't allocate any memory.Signed-off-by: Ben Skeggs
Signed-off-by: Dave Airlie
07 Mar, 2011
8 commits
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Early gen3 and gen2 chipset do not have the relaxed per-surface tiling
constraints of the later chipsets, so we need to check that the GTT
alignment is correct for the new tiling. If it is not, we need to
rebind.Reported-by: Daniel Vetter
Reviewed-by: Daniel Vetter
Signed-off-by: Chris Wilson -
Andi Kleen narrowed his GPU hangs on his Sugar Bay (SNB desktop) rev 09
down to the use of GPU semaphores, and we already know that they appear
broken up to Huron River (mobile) rev 08. (I'm optimistic that disabling
GPU semaphores is simply hiding another bug by the latency and
side-effects of the additional device interaction it introduces...)However, use of semaphores is a massive performance improvement... Only
as long as the system remains stable. Enable at your peril.Reported-by: Andi Kleen
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33921
Signed-off-by: Chris Wilson -
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
ALSA: hda - Don't set to D3 in Cirrus errata init verbs
ALSA: hda - add new Fermi 5xx codec IDs to snd-hda
ASoC: WM8994: Ensure late enable events are processed for the ADCs
ASoC: WM8994: Don't disable the AIF[1|2]CLK_ENA unconditionaly
ASoC: Fix WM9081 platform data initialisation
ALSA: hda - Fix unable to record issue on ASUS N82JV
ALSA: HDA: Realtek: Fixup jack detection to input subsystem -
If a virtio-console device gets unplugged while a port is open, a
subsequent close() call on the port accesses vqs to free up buffers.
This can lead to a crash.The buffers are already freed up as a result of the call to
unplug_ports() from virtcons_remove(). The fix is to simply not access
vq information if port->portdev is NULL.Reported-by: juzhang
CC: stable@kernel.org
Signed-off-by: Amit Shah
Signed-off-by: Rusty Russell
Signed-off-by: Linus Torvalds -
When multiple events were used in 'perf record', allow the user to
choose which one is wanted before showing the per event histograms.Annotations will be performed on the chosen event.
Allow going back and forth from event to event quickly using just the
arrow keys and enter.Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Cc: Tom Zanussi
Cc: William Cohen
LKML-Reference:
Signed-off-by: Arnaldo Carvalho de Melo -
By creating an perf_evlist out of the attributes in the perf.data file
header, so that we can use evlists and evsels when reading recorded
sessions in addition to when we record sessions.More work is needed to allow tools to allow the user to select which
events are wanted when browsing sessions, be it just one or a subset of
them, aggregated or showed at the same time but with different
indications on the UI to allow seeing workloads thru different views at
the same time.But the overall goal/trend is to more uniformly use evsels and evlists.
Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Cc: Tom Zanussi
LKML-Reference:
Signed-off-by: Arnaldo Carvalho de Melo -
The previous situation was to receive an fd from where to read the event
ID.Spin off a routine for when we have the ID handy, not having to read it
from some fd.Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Cc: Tom Zanussi
LKML-Reference:
Signed-off-by: Arnaldo Carvalho de Melo -
Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Cc: Tom Zanussi
LKML-Reference:
Signed-off-by: Arnaldo Carvalho de Melo
06 Mar, 2011
6 commits
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Whilst the GT is powered down (rc6), writes to MMADDR are placed in a
FIFO by the System Agent. This is a limited resource, only 64 entries, of
which 20 are reserved for Display and PCH writes, and so we must take
care not to queue up too many writes. To avoid this, there is counter
which we can poll to ensure there are sufficient free entries in the
fifo."Issuing a write to a full FIFO is not supported; at worst it could
result in corruption or a system hang."Reported-and-Tested-by: Matt Turner
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=34056
Signed-off-by: Chris Wilson -
This reverts commit c2e0eb167070a6e9dcb49c84c13c79a30d672431.
As it turns out, userspace already depends upon being able to enable
tiling on existing bo which it promises to be large enough for its
purposes i.e. it will not access beyond the end of the last full-tile
row.Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35016
Reported-and-tested-by: Kamal Mostafa
Signed-off-by: Chris Wilson -
To support multiple events we need to do these calcs per 'struct hists'
instance, and it turns out we already do that at:__hists__add_entry
hists__inc_nr_entries
hists__calc_col_lenfor all the unfiltered hist_entry instances we stash in the rb tree, so
trow away the dead code.Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Cc: Tom Zanussi
LKML-Reference:
Signed-off-by: Arnaldo Carvalho de Melo -
TAB/UNTAB were not hotkeys, so didn't exit hists__browse back to
hists__tui_browse_tree, allowing just the first event to be browsed.Reported-by: William Cohen
Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Cc: Tom Zanussi
Cc: William Cohen
LKML-Reference:
Signed-off-by: Arnaldo Carvalho de Melo -
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
ceph: no .snap inside of snapped namespace
libceph: fix msgr standby handling
libceph: fix msgr keepalive flag
libceph: fix msgr backoff
libceph: retry after authorization failure
libceph: fix handling of short returns from get_user_pages
ceph: do not clear I_COMPLETE from d_release
ceph: do not set I_COMPLETE
Revert "ceph: keep reference to parent inode on ceph_dentry"
05 Mar, 2011
10 commits
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Signed-off-by: Lin Ming
Signed-off-by: Peter Zijlstra
LKML-Reference:
Signed-off-by: Ingo Molnar -
Pass down the correct node for a transparent hugepage allocation. Most
callers continue to use the current node, however the hugepaged daemon
now uses the previous node of the first to be collapsed page instead.
This ensures that khugepaged does not mess up local memory for an
existing process which uses local policy.The choice of node is somewhat primitive currently: it just uses the
node of the first page in the pmd range. An alternative would be to
look at multiple pages and use the most popular node. I used the
simplest variant for now which should work well enough for the case of
all pages being on the same node.[akpm@linux-foundation.org: coding-style fixes]
Acked-by: Andrea Arcangeli
Signed-off-by: Andi Kleen
Reviewed-by: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This makes a difference for LOCAL policy, where the node cannot be
determined from the policy itself, but has to be gotten from the original
page.Acked-by: Andrea Arcangeli
Signed-off-by: Andi Kleen
Reviewed-by: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add a alloc_page_vma_node that allows passing the "local" node in. Used
in a followon patch.Acked-by: Andrea Arcangeli
Signed-off-by: Andi Kleen
Reviewed-by: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently alloc_pages_vma() always uses the local node as policy node for
the LOCAL policy. Pass this node down as an argument instead.No behaviour change from this patch, but will be needed for followons.
Acked-by: Andrea Arcangeli
Signed-off-by: Andi Kleen
Reviewed-by: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Alexandre Bounine
Cc: Matt Porter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Axel Lin
Cc: Haavard Skinnemoen
Cc: Richard Purdie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Add maintainer of Samsung Mobile machine support. Currently, Aquila,
Goni, Universal (C210), and Nuri board are supported.Signed-off-by: Kyungmin Park
Cc: Joe Perches
Cc: "David S. Miller"
Cc: Russell King
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This driver causes hard lockups, when the active clock soure is jiffies.
The reason is that it loops with interrupts disabled waiting for a
timestamp to be reached by polling getnstimeofday(). Though with a
jiffies clocksource, when that code runs on the same CPU which is
responsible for updating jiffies, then we loop in circles for ever
simply because the timer interrupt cannot update jiffies. So both UP
and SMP can be affected.There is no easy fix for that problem so make it depend on BROKEN for
now.Signed-off-by: Thomas Gleixner
Cc: Alexander Gordeev
Cc: Rodolfo Giometti
Cc: john stultz
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The device table is required to load modules based on modaliases.
Signed-off-by: Axel Lin
Cc: Shubhrajyoti D
Cc: Christoph Mair
Cc: Jonathan Cameron
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
