twitter: linux.kernel - 26 new messages in 18 topics

linux.kernel
http://groups.google.com/group/linux.kernel?hl=en

Today's topics:

* perfevents: Added performance event structure definition, export event
description in the debugfs "perf_events_platform" file - 2 messages, 2 authors
http://groups.google.com/group/linux.kernel/t/e025bcba6c770351?hl=en
* perf_event: circular lock dependency - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/1239a9c16a6fa388?hl=en
* kernel BUG at fs/dcache.c:670 using dmraid - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/4549101f87598bf7?hl=en
* - Fix unmap_vma() bug related to mmu_notifiers - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/506397f77de38486?hl=en
* mmotm 2010-01-28-01-36 uploaded - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/1048092afd321a0f?hl=en
* regulator: Convert fixed voltage regulator to use enable_time() - 1 messages,
1 author
http://groups.google.com/group/linux.kernel/t/5f6a0badb5853962?hl=en
* Add type of locks to lock trace events - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/b401f2c4371a72bd?hl=en
* [PATCH 1/2 v2] perf_event: cleanup for event profile buffer operation - 1
messages, 1 author
http://groups.google.com/group/linux.kernel/t/527b4b036d781f53?hl=en
* sysctl clean up vm related variable declarations - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/6ace9fc4debea132?hl=en
* UIO / of_genirq driver - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/fb471cfd1c8b57f0?hl=en
* PCI host bridge windows ignored (works with pci=use_crs) - 1 messages, 1
author
http://groups.google.com/group/linux.kernel/t/8dc02ff411331726?hl=en
* perf_events: support for uncore a.k.a. nest units - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/c5bab07b177468d1?hl=en
* 2.6.32.5 regression: page allocation failure. order:1, - 1 messages, 1
author
http://groups.google.com/group/linux.kernel/t/a0015010e6b7ea14?hl=en
* bio too big - in nested raid setup - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/67c6a33e58948687?hl=en
* Return proper code to notifier chain in hw_breakpoint_handler - 2 messages,
1 author
http://groups.google.com/group/linux.kernel/t/5bcda265a2b85f32?hl=en
* Improvements for hw_breakpoint_handler() - 1 messages, 1 author
http://groups.google.com/group/linux.kernel/t/d88f905b456ef4b1?hl=en
* PROBLEM: reproducible crash KVM+nf_conntrack all recent 2.6 kernels - 1
messages, 1 author
http://groups.google.com/group/linux.kernel/t/b7334ab84a84dcdb?hl=en
* iommu-api: Rename ->{un}map function pointers to ->{un}map_range - 7
messages, 1 author
http://groups.google.com/group/linux.kernel/t/bc9cc8ebd24768ad?hl=en

==============================================================================
TOPIC: perfevents: Added performance event structure definition, export event
description in the debugfs "perf_events_platform" file
http://groups.google.com/group/linux.kernel/t/e025bcba6c770351?hl=en
==============================================================================

== 1 of 2 ==
Date: Thurs, Jan 28 2010 1:40 am
From: Tomasz Fujak

Signed-off-by: Tomasz Fujak <t.fujak@samsung.com>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Pawel Osciak <p.osciak@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>

---
include/linux/perf_event.h | 19 +++++++++
kernel/perf_event.c | 92 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 111 insertions(+), 0 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index c66b34f..b50e2b8 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -458,6 +458,12 @@ enum perf_callchain_context {

#define PERF_MAX_STACK_DEPTH 255

+#define PERF_EVENT_RAW_BIT (1ULL << 63)
+#define PERF_EVENT_RAW_TO_CONFIG(_val) ((_val) | PERF_EVENT_RAW_BIT)
+#define PERF_EVENT_CONFIG_TO_RAW(_val) ((_val) & ~PERF_EVENT_RAW_BIT)
+#define PERF_EVENT_IS_RAW(_val) ((_val) & PERF_EVENT_RAW_BIT)
+
+
struct perf_callchain_entry {
__u64 nr;
__u64 ip[PERF_MAX_STACK_DEPTH];
@@ -554,6 +560,19 @@ struct perf_mmap_data {
void *data_pages[0];
};

+struct perf_event_description {
+ struct list_head list;
+
+ /* type : 1, subsystem [0..7], id [56..63]*/
+ __u64 config;
+ __u64 min_value; /* min. wakeup period */
+ __u64 max_value; /* max. wakeup period */
+ __u32 flags; /* ??? */
+ __u32 reserved[3];
+ char *name;
+ char *description;
+};
+
struct perf_pending_entry {
struct perf_pending_entry *next;
void (*func)(struct perf_pending_entry *);
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 603c0d8..dc68f0b 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -31,6 +31,9 @@
#include <linux/ftrace_event.h>
#include <linux/hw_breakpoint.h>

+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
#include <asm/irq_regs.h>

/*
@@ -99,6 +102,10 @@ void __weak hw_perf_enable(void) { barrier(); }
void __weak hw_perf_event_setup(int cpu) { barrier(); }
void __weak hw_perf_event_setup_online(int cpu) { barrier(); }

+static LIST_HEAD(perf_event_empty);
+
+const struct list_head __weak *perf_events_platform;
+
int __weak
hw_perf_group_sched_in(struct perf_event *group_leader,
struct perf_cpu_context *cpuctx,
@@ -5333,6 +5340,83 @@ perf_set_overcommit(struct sysdev_class *class, const char *buf, size_t count)
return count;
}

+static void *platevent_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct list_head *spos = NULL;
+
+ if (perf_events_platform) {
+ loff_t count = *pos;
+ struct list_head *curr;
+
+ list_for_each(curr, perf_events_platform)
+ if (!count--)
+ break;
+
+ if (curr != perf_events_platform) {
+ s->private = perf_events_platform;
+ spos = curr;
+ }
+ }
+
+ return spos;
+}
+
+static void *platevent_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct list_head *curr = (struct list_head *)v;
+ struct list_head *head = (struct list_head *)s->private;
+
+ if (list_is_last(curr, head))
+ return NULL;
+
+ ++(*pos);
+ return curr->next;
+}
+
+static void platevent_seq_stop(struct seq_file *s, void *v)
+{
+ kfree(v);
+}
+
+static int platevent_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *curr = (struct list_head *)v;
+
+ if (curr) {
+ struct perf_event_description *entry = list_entry(curr,
+ struct perf_event_description, list);
+
+ if (PERF_EVENT_IS_RAW(entry->config))
+ seq_printf(s, "0x%llx\t%s\t%lld-%lld\t%s\n",
+ PERF_EVENT_CONFIG_TO_RAW(entry->config),
+ entry->name, entry->min_value,
+ entry->max_value, entry->description);
+ }
+
+ return 0;
+}
+
+static const struct seq_operations platevent_seq_ops = {
+ .start = platevent_seq_start,
+ .next = platevent_seq_next,
+ .stop = platevent_seq_stop,
+ .show = platevent_seq_show
+};
+
+static int platevent_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &platevent_seq_ops);
+};
+
+static const struct file_operations platevent_file_ops = {
+ .owner = THIS_MODULE,
+ .open = platevent_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release
+};
+
+
static SYSDEV_CLASS_ATTR(
reserve_percpu,
0644,
@@ -5358,8 +5442,16 @@ static struct attribute_group perfclass_attr_group = {
.name = "perf_events",
};

+
static int __init perf_event_sysfs_init(void)
{
+ struct dentry *dentry;
+
+ dentry = debugfs_create_file("perf_events_platform", 0444, NULL,
+ NULL, &platevent_file_ops);
+ if (!dentry)
+ printk(KERN_WARNING "Cannot create debugfs entry 'perf_events_platform'\n");
+
return sysfs_create_group(&cpu_sysdev_class.kset.kobj,
&perfclass_attr_group);
}
--
1.5.4.3

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== 2 of 2 ==
Date: Thurs, Jan 28 2010 3:00 am
From: Peter Zijlstra

On Thu, 2010-01-28 at 10:34 +0100, Tomasz Fujak wrote:
> Human readable description support for performance events v2. With perf support included.
> Changes from v1:
> - applied on top of latest perf_event/ARM (5899/1 - 5903/1)
> - moved to debugfs, now based on seq_file
> - reads one line at a time, memory overallocation fixed [perf]

You can keep sending these patches, but I'll keep ignoring them
eventually adding you to the /dev/null redirect.

==============================================================================
TOPIC: perf_event: circular lock dependency
http://groups.google.com/group/linux.kernel/t/1239a9c16a6fa388?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 1:50 am
From: Stephane Eranian

On Thu, Jan 28, 2010 at 10:32 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> On Thu, 2010-01-28 at 10:19 +0100, Stephane Eranian wrote:
>
>> On Intel Core, one of my test programs generate this kind of
>> warning when it unmaps the sampling buffer after it has closed
>> the events fds.
>
>> [ 1729.441066] the existing dependency chain (in reverse order) is:
>> [ 1729.441092]
>> [ 1729.441093] -> #1 (&mm->mmap_sem){++++++}:
>> [ 1729.441123] [<ffffffff81077f97>] validate_chain+0xc17/0x1360
>> [ 1729.441151] [<ffffffff81078a53>] __lock_acquire+0x373/0xb30
>> [ 1729.441170] [<ffffffff810792ac>] lock_acquire+0x9c/0x100
>> [ 1729.441189] [<ffffffff810e74a4>] might_fault+0x84/0xb0
>> [ 1729.441207] [<ffffffff810c3605>] perf_read+0x135/0x2d0
>> [ 1729.441225] [<ffffffff8110c604>] vfs_read+0xc4/0x180
>> [ 1729.441245] [<ffffffff8110ca10>] sys_read+0x50/0x90
>> [ 1729.441263] [<ffffffff81002ceb>] system_call_fastpath+0x16/0x1b
>> [ 1729.441284]
>> [ 1729.441284] -> #0 (&ctx->mutex){+.+...}:
>> [ 1729.441313] [<ffffffff810786cd>] validate_chain+0x134d/0x1360
>> [ 1729.441332] [<ffffffff81078a53>] __lock_acquire+0x373/0xb30
>> [ 1729.441351] [<ffffffff810792ac>] lock_acquire+0x9c/0x100
>> [ 1729.441369] [<ffffffff81442e59>] mutex_lock_nested+0x69/0x340
>> [ 1729.441389] [<ffffffff810c2ebd>] perf_event_release_kernel+0x2d/0xe0
>> [ 1729.441409] [<ffffffff810c2f8b>] perf_release+0x1b/0x20
>> [ 1729.441426] [<ffffffff8110d051>] __fput+0x101/0x230
>> [ 1729.441444] [<ffffffff8110d457>] fput+0x17/0x20
>> [ 1729.441462] [<ffffffff810e98d1>] remove_vma+0x51/0x90
>> [ 1729.441480] [<ffffffff810ea708>] do_munmap+0x2e8/0x340
>> [ 1729.441498] [<ffffffff810ebac0>] sys_munmap+0x50/0x80
>> [ 1729.441516] [<ffffffff81002ceb>] system_call_fastpath+0x16/0x1b
>> [ 1729.441535]
>
> Crap, the thing is right.. you've been using group reads, which require
> holding the ctx->mutex to ensure the group doesn't change while you're
> reading it, leading to this inversion thing...
>
Correct, I am using PERF_READ_GROUP and PERF_SAMPLE_READ.

> Not sure where to break this loop though, the hacky way is pushing all
> of perf_event_release_kernel() into a work, but that's yucky.. Let me
> ponder this a bit more.
>
>

--
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==============================================================================
TOPIC: kernel BUG at fs/dcache.c:670 using dmraid
http://groups.google.com/group/linux.kernel/t/4549101f87598bf7?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 1:50 am
From: Thomas Backlund

Thomas Backlund skrev 28.1.2010 01:01:
> Hi, (please cc me on response)
>

[fixed typo in subject and message]

>
> I'm hitting a kernel BUG at fs/dcache.c:670 bug using dmraid on 2.6.32
> and 2.6.33-rc5-git2 kernels:
>
> Distro: Mandriva Linux Cooker
> Arch: x86_64
>
> Hardware: Intel ICH10R with 4 x 500GB disks in biosraid10,
> System has 8GB ram
>
> OOPS: http://tmb.mine.nu/Mandriva/Cooker/bugs/fs-dcache-bug/dsc00918.jpg
> config: http://tmb.mine.nu/Mandriva/Cooker/bugs/fs-dcache-bug/x86_64.config
>
> This happends on 2.6.33-rc5-git2, 2.6.32, and seems to be as old as
> 2.6.32-rc1.
>
> 2.6.31 is the latest kernel that actually boots on this system.
>
> I tried to bisect between 2.6.31 and 2.6.32-rc1, but it failed...
>
> Now before I start a second bisect, I decided to post here in case some
> one has some suggestions / pointers...
>

--
Thomas
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==============================================================================
TOPIC: - Fix unmap_vma() bug related to mmu_notifiers
http://groups.google.com/group/linux.kernel/t/506397f77de38486?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 2:10 am
From: Andrea Arcangeli

On Wed, Jan 27, 2010 at 09:49:44PM -0600, Robin Holt wrote:
> > I think that with the SRCU patch, we have enough. Is that true or have
> > I missed something?
>
> I wasn't quite complete in my previous email. Your srcu patch
> plus Jack's patch to move the tlb_gather_mmu to after the
> mmu_notifier_invalidate_range_start().

My pmdp_clear_flush_notify with transparent hugepage will give some
trouble because it's using mmu_notifier_invalidate_range_start to
provide backwards compatible API to mmu notifier users like GRU that
may be mapping physical hugepages with 4k secondary tlb mappings
(which have to be all invalidated not only the first one). So that
would still require the full series as it's like if the rmap code
would be using mmu_notifier_invalidate_range_start. But we can
probably get away by forcing all mmu notifier methods to provide a
mmu_notifier_invalidate_hugepage.

But in addition to srcu surely you also need i_mmap_lock_to_sem for
unmap_mapping_range_vma taking i_mmap_lock, basically you missed
truncate. Which then in cascade requires free_pgtables,
rwsem-contended, unmap_vmas (the latter are for the tlb gather
required to be in atomic context to avoid scheduling to other cpus
while holding the tlb gather).

So you only avoid the need of anon-vma switching to rwsem (because
there's no range-vmtruncate but only rmap uses it on a page-by-page
basis with mmu_notifier_invalidate_page). So at that point IMHO you
can as well add a CONFIG_MMU_NOTIFIER_SLEEPABLE and allow scheduling
everywhere in mmu notifier IMHO, but if you prefer to avoid changing
anon_vma lock to rwsem and add refcounting that is ok with me too. I
just think it'd be cleaner to switch them all to sleepable code if we
have to provide for it and most of the work on the i_mmap_lock side is
mandatory anyway.
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==============================================================================
TOPIC: mmotm 2010-01-28-01-36 uploaded
http://groups.google.com/group/linux.kernel/t/1048092afd321a0f?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 2:10 am
From: akpm@linux-foundation.org

The mm-of-the-moment snapshot 2010-01-28-01-36 has been uploaded to

http://userweb.kernel.org/~akpm/mmotm/

and will soon be available at

git://zen-kernel.org/kernel/mmotm.git

It contains the following patches against 2.6.33-rc5:

origin.patch
linux-next.patch
linux-next-git-rejects.patch
next-remove-localversion.patch
i-need-old-gcc.patch
hardware-latency-detector-remove-default-m.patch
revert-input-wistron_btns-switch-to-using-sparse-keymap-library.patch
drivers-media-video-cx23885-needs-kfifo-conversion.patch
idr-fix-a-critical-misallocation-bug.patch
mx3fb-some-debug-and-initialisation-fixes.patch
rtc-fm3130-add-missing-braces.patch
kfifo-fix-kernel-doc-notation.patch
mm-flush-dcache-before-writing-into-page-to-avoid-alias.patch
devmem-check-vmalloc-address-on-kmem-read-write.patch
devmem-fix-kmem-write-bug-on-memory-holes.patch
get_maintainerpl-teach-git-log-to-use-no-color.patch
markup_oopspl-fix-func_offset-error-with-x86_64.patch
cgroups-fix-to-return-errno-in-a-failure-path.patch
zlib-make-new-optimized-inflate-endian-independent.patch
zlib-make-new-optimized-inflate-endian-independent-checkpatch-fixes.patch
mm-add-swap-slot-free-callback-to-block_device_operations.patch
mm-add-swap-slot-free-callback-to-block_device_operations-fix.patch
drivers-acpi-processor_idlec-add-two-laptops-to-the-c-state-dmi-table.patch
drivers-gpu-vga-vgaarbc-fix-userspace-pointer-dereference.patch
futex_lock_pi-key-refcnt-fix.patch
mtd-nand-fix-build-failure-caused-by-typo.patch
starfire-clean-up-properly-if-firmware-loading-fails.patch
ibmphp-read-the-length-of-ebda-and-map-entire-ebda-region-fix.patch
sched-f83f9ac-causes-tasks-running-at-max_prio.patch
hpsa-fix-scsi-status-reporting-yet-again.patch
drivers-scsi-sesc-eliminate-double-free.patch
kernel-credc-use-kmem_cache_free.patch
tpm_infineon-fix-suspend-resume-handler-for-pnp_driver.patch
oprofile-x86-fix-crash-when-profiling-more-than-28-events.patch
dell_laptop-when-the-hardware-switch-is-disabled-dont-actually-allow-changing-the-softblock-status.patch
acpi-fix-confusion-in-acpi_evaluate_string-in-comment.patch
acpi-remove-superfluous-null-pointer-check-from-acpi_processor_get_throttling_info.patch
acpica-fix-acpi_ex_release_mutex-comment.patch
asus-acpi-remove-duplicate-comparison-of-asus_model-strings.patch
thinkpad-acpi-wrong-thermal-attribute_group-removed-in-thermal_exit.patch
arch-x86-mm-gupc-fix-minor-spelling-error-in-comments.patch
doc-document-nopat-parameter.patch
pci-update-pci_set_vga_state-to-call-arch-functions.patch
pci-update-pci_set_vga_state-to-call-arch-functions-fix.patch
x86_64-uv-update-uv-arch-to-target-legacy-vga-i-o-correctly.patch
vgaarb-fix-vga-arbiter-to-accept-pci-domains-other-than-0.patch
vgaarb-add-user-selectability-of-the-number-of-gpus-in-a-system.patch
arm-convert-proc-cpu-aligment-to-seq_file.patch
arch-arm-plat-pxa-dmac-correct-null-test.patch
arm-convert-to-arch_gettimeoffset.patch
gemini-wrong-registers-used-to-set-reg_level-in-gpio_set_irq_type.patch
cpufreq-ondemand-dont-synchronize-sample-rate-unless-mulitple-cpus-present.patch
cpufreq-ondemand-dont-synchronize-sample-rate-unless-mulitple-cpus-present-checkpatch-fixes.patch
cpufreq-ondemand-refactor-frequency-increase-code.patch
cpufreq-ondemand-independent-max-speed-for-nice-threads-with-nice_max_freq.patch
cpufreq-ondemand-independent-max-speed-for-nice-threads-with-nice_max_freq-fix.patch
dma-cases-ipu_pix_fmt_bgra32-bgr32-and-abgr32-are-the-same-in-ipu_ch_param_set_size.patch
powerpc-sky-cpu-redundant-or-incorrect-tests-on-unsigned.patch
kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only.patch
dnotify-move-dir_notify_enable-declaration.patch
drivers-gpu-drm-radeon-radeon_combiosc-fix-warning.patch
drivers-gpu-drm-nouveau-nouveau_grctxc-correct-null-test.patch
gpu-drm-i915-fix-potential-null-dereference.patch
drm-dont-use-own-implementation-of-atoi.patch
drivers-gpu-drm-drm_crtc_helperc-fix-setting-of-fb_changed-in-drm_crtc_helper_set_config.patch
drivers-media-video-move-dereference-after-null-test.patch
drivers-media-video-pmsc-needs-versionh.patch
drivers-media-video-kconfig-add-video_dev-dependency-as-needed-in-drivers-media-video-kconfig.patch
cx23885-wrong-command-printed-in-cmd_to_str.patch
radio-add-the-saa7706h-car-radio-dsp-to-v4l2-chip-identh.patch
timer-stats-fix-del_timer_sync-and-try_to_del_timer_sync.patch
posix-cpu-timers-reset-expire-cache-when-no-timer-is-running.patch
hrtimer-correct-a-few-numbers-in-comments.patch
clockevents-ensure-taht-min_delta_ns-is-increased-in-error-path.patch
clocksource-add-argument-to-resume-callback.patch
clocksource-start-cmt-at-clocksource-resume.patch
clocksource-add-suspend-callback.patch
posix-timersc-dont-export-local-functions.patch
timers-introduce-the-concept-of-timer-slack-for-legacy-timers.patch
cpu-timers-simplify-rlimit_cpu-handling.patch
cpu-timers-cleanup-arm_timer.patch
cpu-timers-return-correct-previous-timer-reload-value.patch
cpu-timers-change-sigev_none-timer-implementation.patch
cpu-timers-assure-to-not-iterate-over-all-threads-in-fastpath_timer_check.patch
cpu-timers-optimize-run_posix_cpu_timers.patch
kernel-timekeeping-move-xtime_cache-to-be-in-the-same-cache-line-as-the-lock.patch
ia64-wrong-attribute-of-hub-chip-written-in-uv_setup.patch
infiniband-use-rlimit-helpers.patch
input-bcm5974-retract-efi-broken-suspend_resume.patch
usbtouchscreen-convert-from-usb_device-to-usb_interface.patch
usbtouchscreen-find-input-endpoint-automatically.patch
usbtouchscreen-add-nexio-or-inexio-support.patch
usbtouchscreen-fix-nexio-ack-and-usb-disconnect.patch
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tracehooks-kill-some-pt_ptraced-checks.patch
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ptrace_signal-check-pt_ptraced-before-reporting-a-signal.patch
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reiser4-drop-journal-info.patch
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reiser4-some-changes-from-reiser4-2631-patch.patch
reiser4-some-comments-were-still-mentioning-pdflush.patch
reiser4-generic_sync_sb_inodes-doesnt-exist-anymore.patch
reiser4-fixed-null-pointer-dereference.patch
make-sure-nobodys-leaking-resources.patch
journal_add_journal_head-debug.patch
releasing-resources-with-children.patch
make-frame_pointer-default=y.patch
mutex-subsystem-synchro-test-module.patch
mutex-subsystem-synchro-test-module-add-missing-header-file.patch
slab-leaks3-default-y.patch
put_bh-debug.patch
add-debugging-aid-for-memory-initialisation-problems.patch
workaround-for-a-pci-restoring-bug.patch
prio_tree-debugging-patch.patch
single_open-seq_release-leak-diagnostics.patch
add-a-refcount-check-in-dput.patch
getblk-handle-2tb-devices.patch
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==============================================================================
TOPIC: regulator: Convert fixed voltage regulator to use enable_time()
http://groups.google.com/group/linux.kernel/t/5f6a0badb5853962?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 2:30 am
From: Mark Brown

It had an open coded version in enable().

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
---
drivers/regulator/fixed.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index ee3e7eb..a3d3bfc 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -50,8 +50,6 @@ static int fixed_voltage_enable(struct regulator_dev *dev)
if (gpio_is_valid(data->gpio)) {
gpio_set_value_cansleep(data->gpio, data->enable_high);
data->is_enabled = 1;
- if (data->startup_delay)
- udelay(data->startup_delay);
}

return 0;
@@ -69,6 +67,13 @@ static int fixed_voltage_disable(struct regulator_dev *dev)
return 0;
}

+static int fixed_voltage_enable_time(struct regulator_dev *dev)
+{
+ struct fixed_voltage_data *data = rdev_get_drvdata(dev);
+
+ return data->startup_delay;
+}
+
static int fixed_voltage_get_voltage(struct regulator_dev *dev)
{
struct fixed_voltage_data *data = rdev_get_drvdata(dev);
@@ -91,6 +96,7 @@ static struct regulator_ops fixed_voltage_ops = {
.is_enabled = fixed_voltage_is_enabled,
.enable = fixed_voltage_enable,
.disable = fixed_voltage_disable,
+ .enable_time = fixed_voltage_enable_time,
.get_voltage = fixed_voltage_get_voltage,
.list_voltage = fixed_voltage_list_voltage,
};
--
1.6.6

==============================================================================
TOPIC: Add type of locks to lock trace events
http://groups.google.com/group/linux.kernel/t/b401f2c4371a72bd?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 2:30 am
From: Peter Zijlstra

On Tue, 2010-01-26 at 14:56 +0900, Hitoshi Mitake wrote:
> # Sorry, I wrote wrong Cc address. Previous mail was rejected by mailer-daemon.
> # This is second time sending, if you already received this, please discard it...
>
> There's no need to add any member to lockdep_map
> for adding information of type of locks to lock trace events.
>
> Example of perf trace:
> | init-0 [001] 335.078670: lock_acquired: 0xffff8800059d6bd8 &rq->lock kernel/lockdep.c:2973 (0 ns)
> | rb_consumer-424 [001] 335.078673: lock_acquire: 0xffff8800059d6bd8 1 &rq->lock kernel/lockdep.c:2973
> | # ^ &rq->lock is spin lock!
> | rb_consumer-424 [001] 335.078677: lock_acquire: 0xffff8800bba5e8e8 1 buffer->reader_lock_key kernel/trace/ring_
> | rb_consumer-424 [001] 335.078679: lock_acquired: 0xffff8800bba5e8e8 buffer->reader_lock_key kernel/trace/ring_b
> | rb_consumer-424 [001] 335.078684: lock_acquire: 0xffff8800059d12e8 1 &q->lock kernel/smp.c:83
>
> Of course, as you told, type of lock dealing with is clear for human.
> But it is not clear for programs like perf lock.
>
> What I want to do is limiting types of lock focus on.
> e.g. perf lock prof --type spin,rwlock
>
> How do you think, Peter?

I still don't see the use for it, surely you're going to be familiar
with the code if you're looking at lock statistics?

==============================================================================
TOPIC: [PATCH 1/2 v2] perf_event: cleanup for event profile buffer operation
http://groups.google.com/group/linux.kernel/t/527b4b036d781f53?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 2:40 am
From: Frederic Weisbecker

On Thu, Jan 28, 2010 at 09:32:29AM +0800, Xiao Guangrong wrote:
> Introduce ftrace_perf_buf_prepare() and ftrace_perf_buf_submit() to
> operate event profile buffer, clean up redundant code
>
> Changlog v1->v2:
> - Rename function name address Masami and Frederic's suggestion
> - Add __kprobes for ftrace_perf_buf_prepare() and make
> ftrace_perf_buf_submit() inline address Masami's suggestion
> - Export ftrace_perf_buf_prepare since module will use it
>
> Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
> Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
> ---
> include/linux/ftrace_event.h | 18 ++++++-
> include/trace/ftrace.h | 48 +++-----------------
> kernel/trace/trace_event_profile.c | 52 +++++++++++++++++++--
> kernel/trace/trace_kprobe.c | 86 ++++-------------------------------
> kernel/trace/trace_syscalls.c | 71 ++++-------------------------
> 5 files changed, 88 insertions(+), 187 deletions(-)

I'm queuing these two patches, thanks Xiao!

==============================================================================
TOPIC: sysctl clean up vm related variable declarations
http://groups.google.com/group/linux.kernel/t/6ace9fc4debea132?hl=en
==============================================================================

== 1 of 1 ==
Date: Thurs, Jan 28 2010 2:40 am
From: KAMEZAWA Hiroyuki

On Thu, 28 Jan 2010 00:54:49 -0800 (PST)
David Rientjes <rientjes@google.com> wrote:

> > ---
> > include/linux/mm.h | 5 +++++
> > include/linux/mmzone.h | 1 +
> > include/linux/oom.h | 5 +++++
> > kernel/sysctl.c | 16 ++--------------
> > mm/mmap.c | 5 +++++
> > 5 files changed, 18 insertions(+), 14 deletions(-)
> >
> > Index: mmotm-2.6.33-Jan15-2/include/linux/mm.h
> > ===================================================================
> > --- mmotm-2.6.33-Jan15-2.orig/include/linux/mm.h
> > +++ mmotm-2.6.33-Jan15-2/include/linux/mm.h
> > @@ -1432,6 +1432,7 @@ int in_gate_area_no_task(unsigned long a
> > #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);})
> >

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Thursday, January 28, 2010

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