Hi,
To get used to develop for ARM, do you think I should focus on Linux kernel
development or on Android project development?
Would a Cortex-A* chip be valid as development platform? If so I will buy
the "Exynos4 Quad Mobile Development Platform" at hardkernel.com.
http://www.hardkernel.com
i/o blocks,
timers and fsync.
Very initial stage, it has only been slightly tested and isn't ready for prime.
The syscall wire up patches were skipped, the complete patch set can be found
at:
http://haxent.com/~davi/pollfs/
Comments are welcome.
--
Davi Arnaut
-
To unsubscribe from this list
Add pollfs_fs.h header which contains the kernel-side declarations
and auxiliary macros for type safety checks.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/include/linux/pollfs_fs.h
===
--- /de
Asynchronously run work items.
If the worker thread blocks while the kernel executes the work function
call a new worker thread is created (if one is not available) to handle
the remaining workqueue items.
Various errors and resource limitations are not yet handled.
Signed-off-by: Davi E. M
Add a wait queue to the task_struct in order to be able to
associate (wait for) a signal with other resources.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/include/linux/sched.h
===
--- linux-2.
Per file descriptor high-resolution timers. A classic unix file interface for
the POSIX timer_(create|settime|gettime|delete) family of functions.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/pollfs/t
Retrieve multiple per-process signals through a file descriptor.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/pollfs/signal.c
===
--- /dev/null
+++ linux-2.6/fs/pollfs/signal.c
@@ -0,0
: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/pollfs/Makefile
===
--- linux-2.6.orig/fs/pollfs/Makefile
+++ linux-2.6/fs/pollfs/Makefile
@@ -3,3 +3,4 @@ pollfs-y := file.o
pollfs-$(CONFIG_POLLFS_SIGNAL) += si
Compat handlers for the pollable signal operations.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/pollfs/signal.c
===
--- linux-2.6.orig/fs/pollfs/signal.c
+++ linux-2.6/fs/pollfs/signal.c
@@
Break apart and export the futex_wait function in order to be able to
associate (wait for) a futex with other resources.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/kernel/futex.c
===
--- linux-2.
Submit, retrieve, or poll aio requests for completion through a
file descriptor. Untested.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/pollfs/Makefile
===
--- linux-2.6.orig/fs/pollfs/Ma
The aio_ring_empty() function returns true if the AIO event ring has no
elements, false otherwise.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/aio.c
===
--- linux-2.6.orig/fs/aio.c
+++ linux-
Pollable asynchronous fsync() using a global workqueue. Maybe a sync_file_range
in the future.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/pollfs/Makefile
===
--- linux-2.6.orig/fs/pollfs/Ma
block.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
Index: linux-2.6/fs/pollfs/file.c
===
--- /dev/null
+++ linux-2.6/fs/pollfs/file.c
@@ -0,0 +1,238 @@
+/*
+ * Copyright (C) 2007 Davi E. M. Arnaut
+ *
+ * Licensed und
Hello,
Two days ago i bought from your website at value 215.60 dedic.
I used my credit card to pay for 215.60 for those service.
Yesterday morning when I checked my account, I had the transaction charged
twice.
I have attached my bank statement that shows the double charge.
Plase let me know
Hi,
poll_wait() callback may modify the waitqueue without holding the
context private lock.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
diff --git a/fs/eventfd.c b/fs/eventfd.c
index 480e2b3..9c672be 100644
--- a/fs/eventfd.c
+++ b/fs/eventfd.c
@@ -50,7 +50,7 @@ int eventfd_
entitled "Analyzing the
Overload Behavior of a Simple Web Server". The paper lists more details
and advantages.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 7cfeab4..f6303c5 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.
: 3579, holes: 13, sum holes: 53 */
/* bit holes: 2, sum bit holes: 62 bits */
/* last cacheline: 48 bytes */
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
drivers/char/drm/drmP.h |4 ++--
drivers/char/drm/drm_lock.c | 16 +---
include/linux/init_
Christoph Hellwig wrote:
> On Sun, May 20, 2007 at 12:40:11AM -0300, Davi Arnaut wrote:
>> Hi,
>>
>> Shrink task_struct by replacing the notifier callback with a
>> notifier list. The block_all_signals() function (and the signal
>> notifier mechanism) has only one
policy of returning 0 when the sighand has been detached
>
> 2) That we _must_not_ call dequeue_signal() in case signalfd_lock() fails
>
> #ACK on the code mod below.
>
> - Davide
>
Andrew, please apply on top.
Sim
one). Once
the exclusive thread finishes transferring it's events, a new thread
is woken if there are more events available.
Makes sense?
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/eventpoll.c |7 +++
1 file changed, 7 insertions(+)
Index: linux-2.6/fs/
Davide Libenzi wrote:
> On Fri, 4 May 2007, Davi Arnaut wrote:
>
>> Hi,
>>
>> If multiple threads are parked on epoll_wait (on a single epoll fd) and
>> events become available, epoll performs a wake up of all threads of the
>> poll wait list, causing a thunder
livery machinery is
not necessary. And it makes me wonder why I hadn't followed its "watch"
approach for futexes:
futex_init(); // Davide's anon fd
futex_add_watch(int fd, void *addr, int val, uint32_t mask);
futex_rm_watch(int fd, uint32_t wd);
Anyway, this unifying event machin
Ulrich Drepper wrote:
> On 5/5/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
>> A google search turns up a few users. It also addresses some complaints
>> from Drepper.
>
> There is a huge problem with this approach and we're back at the
> inadequate interface
Ulrich Drepper wrote:
> On 5/7/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
>> See Linus's message on this same thread.
>
> No. I'm talking about the userlevel side, not kernel side.
So you probably knew the answer before asking the question.
> If a thread is ca
Ulrich Drepper wrote:
> On 5/7/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
>> Anyway, we could extend epoll to be mmapable...
>
> Welcome to kevent, well, except with a lot more ballast and awkward
> interfaces.
So an mmapable epoll is equivalent to kevent.. great! Well
Add pollfs_fs.h header which contains the kernel-side declarations
and auxiliary macros for type safety checks. Those macros can be
simplified later.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
include/linux/pollfs_fs.h | 57 ++
upling the core filesystem from the "subsystems" (mere push and
pop operations).
Currently implemented waitable "objects" are: signals, futexes, ai/o blocks and
timers.
More details at each patch.
http://haxent.com/~davi/pollfs/
Comments are welcome.
--
Davi Arnaut
-
To
Make the plaio syscall available to user-space on x86_64.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/x86_64/ia32/ia32entry.S |1 +
include/asm-x86_64/unistd.h |4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
Index: linux-2.6/arch/x86_64/ia32/ia32e
Export the new plaio syscall prototype. While there, make it "conditional".
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
include/linux/syscalls.h |2 ++
kernel/sys_ni.c |1 +
2 files changed, 3 insertions(+)
Index: linux-2.6/include/
Make the pltimer syscall available to user-space on x86_64.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/x86_64/ia32/ia32entry.S |1 +
include/asm-x86_64/unistd.h |4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
Index: linux-2.6/arch/x86_64/ia32/ia32e
Make the pltimer syscall available to user-space on x86.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/i386/kernel/syscall_table.S |1 +
include/asm-i386/unistd.h|3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6/include/asm-i386/un
userspace or kernel) to eventfd and fixes (supercedes) FUTEX_FD at the same
time.
Building block for pollable semaphores and user-defined events.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/pollfs/Makefile |1
fs/pollfs/futex.c
Export the new plfutex syscall prototype. While there, make it "conditional".
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
include/linux/syscalls.h |2 ++
kernel/sys_ni.c |1 +
2 files changed, 3 insertions(+)
Index: linux-2.6/include/
Make the plfutex syscall available to user-space on x86.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/i386/kernel/syscall_table.S |1 +
include/asm-i386/unistd.h|3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6/include/asm-i386/un
The aio_ring_empty() function returns true if the AIO event ring has no
elements, false otherwise.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/aio.c| 17 +
include/linux/aio.h |1 +
2 files changed, 18 insertions(+)
Index: linux-2.6/fs
Export the new pltimer syscall prototype. While there, make it "conditional".
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
include/linux/syscalls.h |2 ++
kernel/sys_ni.c |1 +
2 files changed, 3 insertions(+)
Index: linux-2.6/include/
Make the plsignal syscall available to user-space on x86.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/i386/kernel/syscall_table.S |1 +
include/asm-i386/unistd.h|3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6/include/asm-i386/un
Submit, retrieve, or poll aio requests for completion through a
file descriptor. User supplies a aio_context_t that is used to
fetch a reference to the kioctx. Once the file descriptor is
closed, the reference is decremented.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/
Add a wait queue to the task_struct in order to be able to
associate (wait for) a signal with other resources.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
include/linux/init_task.h |1 +
include/linux/sched.h |1 +
kernel/fork.c |1 +
kernel/si
Make the plaio syscall available to user-space on x86.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/i386/kernel/syscall_table.S |1 +
include/asm-i386/unistd.h|3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
Index: linux-2.6/include/asm-i386/un
Per file descriptor high-resolution timers. A classic unix file interface for
the POSIX timer_(create|settime|gettime|delete) family of functions.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/pollfs/Makefile |1
fs/pollfs/timer.c
Make the plsignal syscall available to user-space on x86_64.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/x86_64/ia32/ia32entry.S |3 ++-
include/asm-x86_64/unistd.h |4 +++-
2 files changed, 5 insertions(+), 2 deletions(-)
Index: linux-2.6/include/asm-x86_64/un
Make the plfutex syscall available to user-space on x86_64.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
arch/x86_64/ia32/ia32entry.S |1 +
include/asm-x86_64/unistd.h |4 +++-
2 files changed, 4 insertions(+), 1 deletion(-)
Index: linux-2.6/arch/x86_64/ia32/ia32e
Break apart and export the futex_wait function in order to be able to
associate (wait for) a futex with other resources.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
include/linux/futex.h | 80 ++
kernel/futex.c
Export the new plsignal syscall prototype. While there, make it "conditional".
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
include/linux/syscalls.h |2 ++
kernel/sys_ni.c |1 +
2 files changed, 3 insertions(+)
Index: linux-2.6/include/
Retrieve multiple per-process signals through a file descriptor. The mask
of signals can be changed at any time. Also, the compat code can be kept
very simple.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/pollfs/Makefile |2
fs/pollfs/signal.c
Compat handlers for the pollable signal operations. Later the0 compat operations
can operate on a per call basis.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/pollfs/signal.c | 85 +
1 file changed, 85 insertions(+)
block.
Signed-off-by: Davi E. M. Arnaut <[EMAIL PROTECTED]>
---
fs/Makefile|1
fs/pollfs/Makefile |2
fs/pollfs/file.c | 238 +
init/Kconfig |6 +
4 files changed, 247 insertions(+)
Index: linux-2.6/fs/pollfs/
Eric Dumazet wrote:
> Davi Arnaut a écrit :
>> Asynchronously wait for FUTEX_WAKE operation on a futex if it still contains
>> a given value. There can be only one futex wait per file descriptor. However,
>> it can be rearmed (possibly at a different address) anytime.
>
Eric Dumazet wrote:
> Davi Arnaut a écrit :
>> Eric Dumazet wrote:
>>> Davi Arnaut a écrit :
>>>> Asynchronously wait for FUTEX_WAKE operation on a futex if it still
>>>> contains
>>>> a given value. There can be only one futex wait per
Eric Dumazet wrote:
> Davi Arnaut a écrit :
>> Eric Dumazet wrote:
>>> Davi Arnaut a écrit :
>>>> Asynchronously wait for FUTEX_WAKE operation on a futex if it still
>>>> contains
>>>> a given value. There can be only one futex wait per
Ulrich Drepper wrote:
> On 5/1/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
>> The pollable futex approach is far superior (send and receive events from
>> userspace or kernel) to eventfd and fixes (supercedes) FUTEX_FD at the same
>> time.
>> [...]
>
>
Ulrich Drepper wrote:
> On 5/1/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
>> The pollable futex approach is far superior (send and receive events from
>> userspace or kernel) to eventfd and fixes (supercedes) FUTEX_FD at the same
>> time.
>> [...]
>
>
ner and safer
to do it right instead of piling on more and more workarounds for
special situations.
It simple as is, there is no need to overdesign.
--
Davi Arnaut
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
Mo
Ulrich Drepper wrote:
On 5/2/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
It's quite easy to implement this scheme by write()ing the futexes all
at once but that would break the one futex per fd association. For
atomicity: if one of the futexes can't be queued, we would rollba
Ulrich Drepper wrote:
On 5/2/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
thread A:
int fd = plfutex(addr, 0);
do
poll(fdset+fd);
process network events
queue obj to thread B
if fd:
job processed
thread B:
wait_job();
proce
vent_ (address/value).
--
Davi Arnaut
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Ulrich Drepper wrote:
On 5/2/07, Davi Arnaut <[EMAIL PROTECTED]> wrote:
NO! Every single waiter of the _file descriptor_ is waked, not of the
futex.
And how is this better? In this world of yours a program must have
one file descriptor for each single futex which is used like thi
Davide Libenzi wrote:
On Wed, 2 May 2007, Davi Arnaut wrote:
Davide Libenzi wrote:
On Tue, 1 May 2007, Andrew Morton wrote:
David, could you provide some feedback please? The patches are stunningly
free of comments, but you used to do that to me pretty often so my
Davide Libenzi wrote:
On Wed, 2 May 2007, Davi Arnaut wrote:
So in this case I may borrow some signalfd code :-) I really like the
signalfd approach, but IMHO the code is quite ugly and duplicates
a lot of hairy code.
Ugly, really? Please ...
+ while (!mutex_trylock(&
Thomas Gleixner wrote:
> On Wed, 2007-05-02 at 02:22 -0300, Davi Arnaut wrote:
>> plain text document attachment (pollfs-timer.patch)
>> Per file descriptor high-resolution timers. A classic unix file interface for
>> the POSIX timer_(create|settime|gettime|delete
340.004: read: 1; total=84
> 341.004: read: 1; total=85
> ^C
> ==
>
> The after bringing the program back into the foreground, I would have
> expected to get an overrun count of 334 or thereabouts, but it looks as
> though I'm only getting the least signifi
forwarded instruction to the secretary on your behalf to receive
that money, so feel free to get in touch with Ms. Assetou Sam Bagayoko
she will send the amount to you without any delay OK. Extend my
greetings to your family.
My Best regards
Yours brother
Mr. Davi Ulah
Greetings from Vietnam
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