linux.git/block/blktrace.c, branch v2.6.24

blktrace: kill the unneeded initcall

2008-01-11T12:37:01+00:00

It just inits the mutex, we can do that with DEFINE_MUTEX() instead.

Signed-off-by: Jens Axboe

block: fix blktrace timestamps

2008-01-11T12:35:54+00:00

David Dillow reported broken blktrace timestamps. The reason
is cpu_clock() which is not a global time source.

Fix bkltrace timestamps by using ktime_get() like the networking
code does for packet timestamps. This also removes a whole lot
of complexity from bkltrace.c and shrinks the code by 500 bytes:

   text    data     bss     dec     hex filename
   2888     124      44    3056     bf0 blktrace.o.before
   2390     116      44    2550     9f6 blktrace.o.after

Signed-off-by: Ingo Molnar 
Signed-off-by: Jens Axboe

blktrace: Make sure BLKTRACETEARDOWN does the full cleanup.

2007-11-27T08:19:39+00:00

if blktrace program segfault it will not be able
to call BLKTRACETEARDOWN. Now if we run the blktrace
again that would result in a failure to create the
block/ debugfs directory.This will result
in blk_remove_root() to be called which will set
blk_tree_root to NULL. But the  debugfs block dir
still exist because it contain subdirectory.

Now if we try to fix it using BLKTRACETEARDOWN
it won't work because blk_tree_root is NULL.

Fix the same.

Tested as below

root@qemu-image:/home/kvaneesh/blktrace# ./blktrace  -d /dev/hdc
Segmentation fault
root@qemu-image:/home/kvaneesh/blktrace# ./blktrace  -d /dev/hdc
BLKTRACESETUP: No such file or directory
Failed to start trace on /dev/hdc
root@qemu-image:/home/kvaneesh/blktrace# ./blktrace  -k /dev/hdc
root@qemu-image:/home/kvaneesh/blktrace# ./blktrace  -d /dev/hdc

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Jens Axboe

Convert cpu_sibling_map to be a per cpu variable

2007-10-16T16:42:50+00:00

Convert cpu_sibling_map from a static array sized by NR_CPUS to a per_cpu
variable.  This saves sizeof(cpumask_t) * NR unused cpus.  Access is mostly
from startup and CPU HOTPLUG functions.

Signed-off-by: Mike Travis 
Cc: Andi Kleen 
Cc: Christoph Lameter 
Cc: "Siddha, Suresh B" 
Cc: "David S. Miller" 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
Cc: "Luck, Tony" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

compat_ioctl: handle blk_trace ioctls

2007-10-10T07:26:00+00:00

blk_trace_setup is broken on x86_64 compat systems,
this makes the code work correctly on all 64 bit architectures
in compat mode.

Signed-off-by: Arnd Bergmann 
Signed-off-by: Jens Axboe

blktrace: use cpu_clock() instead of sched_clock()

2007-07-27T06:08:24+00:00

use cpu_clock() instead of sched_clock(). (the latter is not a proper
clock-source)

Signed-off-by: Ingo Molnar 
Signed-off-by: Jens Axboe

[BLOCK] Get rid of request_queue_t typedef

2007-07-24T07:28:11+00:00

Some of the code has been gradually transitioned to using the proper
struct request_queue, but there's lots left. So do a full sweet of
the kernel and get rid of this typedef and replace its uses with
the proper type.

Signed-off-by: Jens Axboe

[PATCH] mark struct file_operations const 3

2007-02-12T17:48:45+00:00

Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Relay: add CPU hotplug support

2007-02-11T18:51:28+00:00

Mathieu originally needed to add this for tracing Xen, but it's something
that's needed for any application that can be tracing while cpus are added.

unplug isn't supported by this patch.  The thought was that at minumum a new
buffer needs to be added when a cpu comes up, but it wasn't worth the effort
to remove buffers on cpu down since they'd be freed soon anyway when the
channel was closed.

[zanussi@us.ibm.com: avoid lock_cpu_hotplug deadlock]
Signed-off-by: Mathieu Desnoyers 
Cc: Tom Zanussi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Allow NULL pointers in percpu_free

2006-12-07T16:39:22+00:00

The patch (as824b) makes percpu_free() ignore NULL arguments, as one would
expect for a deallocation routine.  (Note that free_percpu is #defined as
percpu_free in include/linux/percpu.h.) A few callers are updated to remove
now-unneeded tests for NULL.  A few other callers already seem to assume
that passing a NULL pointer to percpu_free() is okay!

The patch also removes an unnecessary NULL check in percpu_depopulate().

Signed-off-by: Alan Stern 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds