On Wed, 13 Mar 2019 12:02:02 +0530, Jay Aurabind said:
> For the corresponding sysfs interface, since there are a lot of
> parameters, would it be justified to use the same binary format though
> sysfs_create_binary_file() ? The rationale is that it would be easier
> to simply pack all the config
On Wed, 13 Mar 2019 08:48:26 +0800, Gao Xiang said:
(Reversing order of comments)
> "Release slab Memory" is not a very useful description for this function.
Agreed.
> i_callback is used to free inode structure and other memory related to this
> inode
However, that's not a bad description at
On Tue, 12 Mar 2019 23:33:47 +0530, arshad hussain said:
> Re-sending. Previous patch I put in very old kernel-newbies address.
>
> Subject: [PATCH 1/1] staging: erofs: Add function comment for
> erofs/super.c
>
> This patch adds functions comment for file erofs/super.c in
> sphinx format.
>
>
On Sat, 09 Mar 2019 13:04:44 +0300, Lev Olshvang said:
> There is also modulus.dep file which depmod builds. You can just grep to find
> which modulus depends.
Note that the modules.dep file only tells modprobe "If you're loading module A,
you need to load B first to get some symbols
On Wed, 06 Mar 2019 17:20:07 +0530, prashantkumar dhotre said:
> Could you please let me know if any system call can exit with 251 ?
> I am trying to find out who exited with 251 ?
strace is your friend.
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On Wed, 06 Mar 2019 03:50:10 -0500, Jeffrey Walton said:
> Yeah, the race seems to be the downside to ioctl and TIOEXCL.
>
> It is too bad Linux does not honor O_EXCL for the device, or provide a
> similar open flag like SOCK_NONBLOCK was added to avoid the race in
> sockets. It would avoid a lot
On Wed, 06 Mar 2019 01:58:41 -0500, Jeffrey Walton said:
>TIOCEXCL void
> Put the terminal into exclusive mode. No further open(2)
> operations on the terminal are permitted. (They fail with
> EBUSY, except for a process with the CAP_SYS_ADMIN
On Tue, 05 Mar 2019 19:52:13 -0500, Umair Khan said:
> I was just wondering why are these system calls not implemented?
Ah. So now we get to the question you *should* have asked. :)
Depends on the system call and the hardware and the kernel config.
Often, on embedded systems, you know from the
On Tue, 05 Mar 2019 19:08:20 -0500, Umair Khan said:
> I was just roaming around the linux source code when I stumbled upon
> this line -
> https://github.com/torvalds/linux/blob/master/include/linux/syscalls.h#L1200
>
> May I know what is the use of this system call?
/*
* Not a real system
On Mon, 04 Mar 2019 16:38:44 +0100, Yann Droneaud said:
> O_EXCL is intended to be used to prevent opening an existing file. Said
> differently, it's used to ensure a new file is created, useful to
> prevent race condition, where multiple processes compete to create a
> file. For example think of
On Sat, 02 Mar 2019 14:36:12 -0500, Jeffrey Walton said:
> I feel like I am missing something... Does Linux consider the modem a
> shared resource instead of an exclusive resource? What use cases
> support two different programs sending commands to the modem at the
> same time?
The Linux kernel
On Fri, 01 Mar 2019 23:29:53 -0500, Jeffrey Walton said:
> I cannot seem to open the device in exclusive mode. The current open
> is (I also tried with O_EXCL):
>
> int modem = open(device_path, O_RDWR | O_NOCTTY | O_SYNC);
So what happens? Does the open fail? If so, what does perror() say
On Mon, 04 Feb 2019 11:38:19 +0300, Lev Olshvang said:
> I learned recently that IMA kernel security subsystem can be integrated with
> LSMs, such as SELinux, Smack, ...
> https://sourceforge.net/p/linux-ima/wiki/Home/
>
> https://www.kernel.org/doc/Documentation/ABI/testing/ima_policy
>
> It
On Mon, 28 Jan 2019 13:26:55 +, Laurence Rochfort said:
> I'm writing a driver for an ePaper display, that will attach via GPIO.
>
> I've read the docs in Documentation/GPIO, and
> Documentation/devicetree/bindings/gpio.
>
> The ePaper itself just has a 34pin flat-flex cable, so people will
On Sat, 26 Jan 2019 12:12:07 +0530, Bharath Vedartham said:
> On Fri, Jan 25, 2019 at 11:24:33AM -0500, valdis.kletni...@vt.edu wrote:
> > On Fri, 25 Jan 2019 17:11:25 +0530, Bharath Vedartham said:
> > > VM has low RAM. Need to adjust :)
> >
> > Upgrade the hypervisor system so the VM can be
On Fri, 25 Jan 2019 17:11:25 +0530, Bharath Vedartham said:
> On Thu, Jan 24, 2019 at 04:21:32PM +0530, Himanshu Jha wrote:
> > Well, you can try other email clients such as Evolution, Claws ...
> >
> > There is no rule saying to use Mutt exclusively.
> VM has low RAM. Need to adjust :)
Upgrade
On Wed, 23 Jan 2019 23:25:59 +0530, Bharath Vedartham said:
> I am trying to add the 3-axis compass data channels to the
> simple_dummy_channel. I have mounted configfs and am able to load the
> modules correctly. Is this the right approach? printk is not printing
> anything to syslogs.
Do you
On Sat, 12 Jan 2019 16:19:00 +0300, Lev Olshvang said:
> The fact that the text segment could be modified is bad news from the
> security standpoint.
We've known that for at least a decade now. Maybe longer. And we
already had this discussion once, about a week ago.
> I am not sure whether it
On Sun, 06 Jan 2019 21:13:26 +0300, Lev Olshvang said:
> I am trying to harden the embedded system.
> I have embedded system with systemd .
OK, you've already got a problem right there.
It's an embedded system. Therefor, you know everything that should be running,
and what order it should
On Sat, 05 Jan 2019 18:30:01 +0300, Lev Olshvang said:
> Some articles, ex
> https://shanetully.com/2013/12/writing-a-self-mutating-x86_64-c-program/
> state that mprotect() can change protection of executable section.
Note that appears to be a 5 year old article, and one that tries to be
On Mon, 31 Dec 2018 14:53:30 -0500, "Robert P. J. Day" said:
> #define S_IRWXUGO (S_IRWXU|S_IRWXG|S_IRWXO)
> #define S_IALLUGO (S_ISUID|S_ISGID|S_ISVTX|S_IRWXUGO)
> #define S_IRUGO (S_IRUSR|S_IRGRP|S_IROTH)
> #define S_IWUGO (S_IWUSR|S_IWGRP|S_IWOTH)
>
On Sun, 23 Dec 2018 11:41:30 +0300, Lev Olshvang said:
> I use security_mmap_file hook.
And what are you trying to accomplish in there?
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On Fri, 21 Dec 2018 16:51:29 +0300, Lev Olshvang said:
> I need to read file inside LSM hook and I can not do it in user space
Why? And which LSM hook are you trying to do this?
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On Thu, 20 Dec 2018 13:33:09 +0300, Lev Olshvang said:
> I use kernel_read to read file in chunks of 4K size in a process context
> On several files, like libc, libm, I got -EINTR error.
What are you trying to accomplish? This is not a recommended way to do things.
> I do not understand who
On Fri, 07 Dec 2018 23:13:45 +0300, Lev Olshvang said:
> Existing file encryption tools, like dm-crypt, fscrypt and eCryptfs provide
> only encryption of files only until file system is mounted. (data at rest)
> The moment it became mounted, every user of computer can try to access the
> data.
On Fri, 30 Nov 2018 20:35:54 +0300, Lev Olshvang said:
> I saw many times that kernel keeps kernel module with reference count of 0 in
> a
> running system until explicit rmmod command is entered/
> Is there any way to require that unused module will be removed from kernel by
> the kernel
On Wed, 21 Nov 2018 17:20:50 +0300, Lev Olshvang said:
> So the questioned config option seems obsolete ?
> Wheher LSM always consulted last ?
If an LSM is configured/loaded, it is always consulted *after* applying
standard DAC file permission bits checks. (Discretionary Access Control- the
On Tue, 20 Nov 2018 18:21:33 +0530, Pintu Agarwal said:
> + sp = current_stack_pointer;
> + if (on_irq_stack(sp, cpu)) {
> + stack_start = (unsigned long)per_cpu(irq_stack, cpu);
> + last_usage = per_cpu(irq_stack_usage, cpu);
> + curr_usage = sp - stack_start;
> +
On Tue, 20 Nov 2018 10:16:41 -0500, Cindy-Sue Causey said:
> First reference is near the top under "AIX 4.3.2+ Deferred Paging
> #2) AIX 5L Differences Guide Version 5.3 Edition
I feel sorry for anybody still running either of these AIX versions (4.3.2
is late 1998, 5.3 is from 2005).
Word of
On Tue, 20 Nov 2018 00:04:03 +0200, Ranran said:
> That's interesting...
> I think the name is confusing, because this chips are also writable.
>
> Not only this, but in arm the eeprom (at24) is writable!
> But in the x86 I am using, it is readonly in kernel code:
>
On Fri, 16 Nov 2018 23:13:48 +0530, Pintu Agarwal said:
> On Fri, Nov 16, 2018 at 10:16 PM wrote:
> > Congrats. You just re-invented DEBUG_STACK_USAGE, which just keeps a
> > high-water mark
> > for stack usage.
>
> So, you mean to say, my implementation is good enough to get the
> irq_stack
On Fri, 16 Nov 2018 20:10:28 +0530, Pintu Agarwal said:
> > Look at the code controlled by '#ifdef CONFIG_DEBUG_STACK_USAGE'
> For example: is it possible to keep storing the irq_stack_usage (for
> each cpu in a variable) information from boot time, and then use this
> variable to dump the
On Fri, 16 Nov 2018 11:44:36 +0530, Pintu Agarwal said:
> > If your question is "Did one
> > of the CPUs blow out its IRQ stack (or come close to doing so)?" there's
> > better
> > approaches.
> >
> Yes, exactly, this is what the main intention.
> If you have any better idea about this approach,
On Thu, 15 Nov 2018 23:53:56 +0800, "Larry" said:
> I'm curious when multiple process has the same PTE which points to the
> samepage,
> how can kernel differenciate which page from swap space should be swappedin?
The PTE tells where in /dev/swap to find the page. If it's a shared page, the
On Thu, 15 Nov 2018 18:52:39 +0530, Pintu Agarwal said:
> Currently, when I tested this (as a proc interface), I got the below output:
> CPUUNUSED-STACKACTUAL-STACK
> 0 16368 16384
> 3) How should I test it to get the different usage values for unused stack ?
On Mon, 12 Nov 2018 02:00:02 +0800, Carter Cheng said:
> Thanks for the reply but the link doesn't quite answer the question. I am
> wondering how the pointer is handled so that there is one per thread by the
> compiler. I perhaps was under the perhaps mistaken impression that the
> stack pointer
On Mon, 05 Nov 2018 11:28:49 -0500, "Austin S. Hemmelgarn" said:
> Also, it's probably worth noting that BTRFS doesn't need to decompress
> the entire file to read or write blocks in the middle, it splits the
> file into 128k blocks and compresses each of those independent of the
> others, so it
On Mon, 05 Nov 2018 11:07:12 -0500, "Austin S. Hemmelgarn" said:
> Performance isn't _too_ bad for the BTRFS case though (I've actually
> tested this before), just make sure you disable direct I/O mode on the
> loop device, otherwise you run the risk of data corruption.
Did you test that for
On Mon, 05 Nov 2018 20:31:46 +0530, Pintu Agarwal said:
> I wanted to have a swapfile (64MB to 256MB) on my system.
> But I wanted the data to be compressed and stored on the disk in my swapfile.
> [Similar to zram, but compressed data should be moved to disk, instead of
> RAM].
What platform
On Tue, 30 Oct 2018 21:19:08 +0300, Lev Olshvang said:
> As I stated, I have no option to come to customer and ask to upgrade his
> kernel, but I will try to put his attention to mentioned by you cease of
> security updates.
If you can't get him to upgrade the installed kernel, it's not worth
On Mon, 29 Oct 2018 00:08:12 +0800, Carter Cheng said:
> Where do I find the code in the kernel related to the MMU and resolving
> memory addresses? I am trying to understand what the implications are if
> code like this has bugs and the impact on the various functions that return
> chunks of
On Tue, 23 Oct 2018 13:56:42 +1100, "Tobin C. Harding" said:
> I'd like to build and boot an allyesconfig kernel with QEMU. Building
> is no problem but when I try to boot it I get problems because the host
> system does not support features requested by the VM.
>
> How does one go about testing
On Mon, 22 Oct 2018 22:32:14 +0530, jitendra kumar khasdev said:
> Working on a custom driver that tracks I/Os on block level. For some use
> case, I need to write metadata of tracked I/Os from driver in shutdown
> sequence (more likely in reboot handler). In reboot handler, performing I/O
> on
On Wed, 17 Oct 2018 20:02:46 +0800, Carter Cheng said:
> The problem is I have to do something special with the clang options. I
> have to add an interprocedural link time optimization pass spitting out
> bitcode files and tying them together using llvm-link.
As I said back on Friday, this is
On Tue, 16 Oct 2018 01:23:45 +0800, Carter Cheng said:
> I am actually looking at some changes that litter the kernel with short
> code snippets and thus according to papers i have read can result in CPU
> hits of around 48% when applied is userspace.
You're going to need to be more specific.
On Mon, 15 Oct 2018 23:42:03 +0800, Carter Cheng said:
> I was wondering what are some good ways to assess the performance impact of
> kernel modifications. Are there some papers in the literature where this is
> done? Does one need to differentiate between CPU bound and different types
> of I/O
On Thu, 11 Oct 2018 21:45:16 +0800, Carter Cheng said:
> There are some detaills about the current procedures for linking the kernel
> that I am unfamiliar with. My understanding is that GCC and Clang both have
> the ability to do link time analysis and transforms on code but is it
> possible to
On Thu, 11 Oct 2018 14:42:56 +0400, o...@goosey.org said:
> 10.10.2018, 19:36, "Carter Cheng" :
> >2. Is there some good way to figure out how to update knowledge gained
> > from
> >this book to what is in the 4.x series of kernels?
> I think all C code-based drivers will work on all
On Wed, 10 Oct 2018 23:35:20 +0800, Carter Cheng said:
> 1. After finishing the book and perhaps Understanding the Linux Kernel and
> Linux Device Drivers. What is the best way to dig deeper.
There's multiple answers to that question, as it depends on the questioner's
preferred
learning style
On Tue, 09 Oct 2018 20:07:08 +0100, John Whitmore said:
> #define alloc_ieee80211 alloc_ieee80211_rsl
>
> So what am I missing or why are a number of functions being redefined
> as another name, which doesn't exist?
There's areas in the kernel which use the preprocessor ##
On Mon, 08 Oct 2018 23:05:56 +0300, Lev Olshvang said:
> Of cause the simplest way which comes to my mind is to send SIGPAUSE to all
> processes, except mine.
Actually, the *simplest* way is to just boot the machine into single-user mode
and
run your test there.
pgp1ddCl5hh2I.pgp
On Fri, 05 Oct 2018 02:58:23 +0100, Mike Krinkin said:
> This might be of interest to you: https://www.criu.org
That's got two problems - first, it's userspace. And second, it's fairly
mature software, which means it's not suitable for a student project
by itself, and all the low-hanging fruit
On Thu, 04 Oct 2018 21:44:14 +0300, Boian Karatotev said:
> I am a Computer Science student and for my last year I need to make and
> present a 'diploma project' at the end of June. So far I want to make a
> kernel module, whose description is in the following paragraph. I feel
> comfortable with
On Thu, 04 Oct 2018 12:44:00 +0100, Paul Nader said:
> I'm trying to enable the max98357a codec in sound/soc/codecs.
> In the Kconfig file it is listed with an empty tristate so it doesn't show
> up when I do a make menu config.
That's usually a result of the variable being enabled by a
On Sun, 30 Sep 2018 16:04:13 +0300, Shubham Singh said:
> Regarding the warning of checkpatch.pl,
> " 'str' object has no attribute 'decode' "
> This warning is related to spdxcheck.py which is because of version of python
> In python3 str has no attribute decode(), while it works fine in
On Wed, 26 Sep 2018 21:38:27 -0700, don fisher said:
> Thanks. I tried building with the driver embedded in the kernel, but the
> compile failed with a halt. No crash is apparent, just a halt. It turned
> out that this was repeated until I removed the netconsole command during
> boot. System
On Wed, 26 Sep 2018 13:25:35 -0700, don fisher said:
> Would you tell me how to tell the driver that it is to be eth0, ip
> address etc. Maybe on linux command line, but I do not know the format.
To quote some guy named Don Fisher:
> my kernel and including the proper command (as shown below) in
On Wed, 26 Sep 2018 16:52:03 +0100, John Whitmore said:
> This might all be a mute point as I seem to remember someone saying
> that memory allocation never fails in Linux and this can only happen
> if the first two allocations work and the third fails.
If memory allocation never fails, it would
John notes that if the kzalloc of ieee->pHTInfo fails, we fail to call
ieee80211_networks_free(). In addition, that function has an un-needed check
before kfree().
Reported-by: John Whitmore
Signed-off-by: Valdis Kletnieks
---
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_modul
On Tue, 25 Sep 2018 18:26:06 -0700, don fisher said:
> The wicked message eth0: up comes at Sep 24 22:02:01.173616. The
> difference is maybe 36 seconds? There is an eth0: avail message at Sep
> 24 22:01:34.112744, don't know if that would suffice for netconsole Both
> are after netconsole has
On Sun, 16 Sep 2018 20:47:41 +0200, Daan Wendelen said:
> The latest nvidia driver is incompatible with 4.19-rc3 because
> "drm_mode_connector_update_edid_property" got renamed to
> "drm_connector_update_edid_property" and
> "drm_mode_connector_attach_encoder" to "drm_connector_attach_encoder" in
On Wed, 19 Sep 2018 09:35:36 +1000, "Tobin C. Harding" said:
> Hi,
>
> I'm after some advice from those more experienced with [kernel]
> development please.
>
> What systems do you have in place to help catch mistakes? In other
> words; what processes do you use when coding and submitting patches
On Sat, 15 Sep 2018 01:19:24 +0530, inventsekar said:
> I didnt get you... I thanked Valdis for his detailed mail..
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in
On Sat, 15 Sep 2018 07:33:51 +0530, inventsekar said:
> Around last year I was searching for Linux Kernel FS design and
> implementation, and I found out a book by someone,.. a full length book,
> particularly, at the end of the book he/she included source code as well...
That sounds like the
On Wed, 12 Sep 2018 22:40:50 +0530, inventsekar said:
> So, please suggest some subsystems or some small puedes of code, where i
> can "dwell" sometimes and submit my first patch.
0) subsystems? Anything under drivers/staging is fair game and certain to
provide hours of amusement...
1) Install
On Tue, 11 Sep 2018 16:26:40 +0530, Muni Sekhar said:
> During kernel drivers testing I see lot of user mode applications
> blocks forever in interruptible sleep mode. Is there any way to get
> the corresponding kernel functions stack trace ?
cat /proc/NNN/stack should do the trick.
>
On Mon, 03 Sep 2018 21:12:35 +0200, Thomas Bracht Laumann Jespersen said:
> The challenge is that my application needs to act within 100 tbits, ie in
> around
> ~.066ms. That is the window in which I need to begin transmitting a reply. Is
> there a way to achieve this with the ftdi_sio driver or
On Sun, 02 Sep 2018 20:58:14 +0530, Abhinav Misra said:
> But if in new kernel this implementation is changed then why we need so
> many options to defer the work as all of them are basically getting
> executed in almost the same way.* In that case code running softirq,
> tasklet, workqueue and
On Fri, 31 Aug 2018 08:53:29 +0800, "phind@gmail.com" said:
> Thank for your time, I'm new to linux kernel. I am reading LDD3 chapter
> 15, Dirrect Memory Access section. I see that when I call function
> /dma_map_single/ and /dma_unmap_single/, I need to pass a direction as a
> parameter.
On Thu, 30 Aug 2018 13:27:13 -0400, "Robert P. J. Day" said:
> i'm already looking at that, but what i wanted was an example of an
> existing, physical driver that shows how simple the design can be (if
> such a thing exists).
For some reason, engineers building network devices almost never
On Thu, 16 Aug 2018 16:29:29 -, Nicholas Mc Guire said:
> Note that you can do system calls directly with system() but that is
> generaly not how you do it - you to through the glibc calls
> which do some checks before invoking the actual system call.
system() does a fork/exec of a process.
On Fri, 10 Aug 2018 22:48:43 +0800, "Larry" said:
> Does it intend to remove existent pages in block device's page cache
> if some new page cache of a vfs file was created whose block number
> range has overlaps with its block device page cache?
That's a situation you *really* hope doesn't
On Mon, 06 Aug 2018 01:10:40 +0800, "He Huanyu" said:
> linux 4.16.9-1-ARCH
> gcc (GCC) 8.1.1 20180531
> GNU ld (GNU Binutils) 2.30
> And I get a problem like this, don't know if it is because of the version of
> gcc or ld:
The problem is the version of Linux. 2.6.11 probably won't build with
On Fri, 03 Aug 2018 15:14:45 +0300, Lev Olshvang said:
> But I need to find out whether my function y() was called from linux kernel
> function x().\
What problem are you trying to solve? If it's your function, don't you already
*know* which functions call it?
And if being called from code A
On Thu, 02 Aug 2018 23:49:03 +0200, Arkadiusz Lis said:
> From 231fa77d595536cdaacf364b02dd64fd45a6adc4 Mon Sep 17 00:00:00 2001
> From: Arkadiusz Lis
> Date: Thu, 2 Aug 2018 23:38:17 +0200
> Subject: [PATCH] Staging: One Laptop Per Child: fix coding style and license
> issues
One thing per
On Thu, 02 Aug 2018 23:12:23 +0530, Abhinav Misra said:
> I want to know is there any alternative for sharing the memory between two
> modules.
Why are two modules trying to share memory? In general, each module should
be managing its own data objects. If two modules need to share, maybe it
On Tue, 31 Jul 2018 15:41:28 +0200, Babis Chalios said:
> I am working on the runtime system of a distributed memory programming
> language. For some reason we need to create a big hole on the address space of
> the application. We are trying to do so by using an mmap during the
> initialization
On Thu, 26 Jul 2018 03:07:27 +0530, Himanshu Jha said:
> Now, this part of section is really important and somehow if you think
> you really learnt C well in the course offered at University. Then
> please take a look at implicit conversions:
> https://en.cppreference.com/w/c/language/conversion
On Tue, 24 Jul 2018 16:59:27 -0400, riya khanna said:
> I'm trying to understand what prevents TOCTTOU race conditions in
> dentry_path_raw
> and link_path_walk? What happens when somebody points a symlink path
> component from a dir that has the attacker is allowed to read to a dir that
> they
On Mon, 23 Jul 2018 19:29:17 +0400, o...@goosey.org said:
> So synaptics is not working, I want to write a driver for synaptics.
> Can I modify a generic synaptics driver?
Step 0 should be to figure out *why* the generic driver isn't working,
because you'll need that information to fix the
On Sun, 22 Jul 2018 17:48:21 +0530, Himanshu Jha said:
> I am currently working on my GSoC project and while testing through
> 0-day test service, I hit the following error:
>424 static u32 bme680_compensate_gas(struct bme680_data *data, u16
> gas_res_adc,
>425
On Wed, 18 Jul 2018 22:16:07 -0300, "Daniel." said:
> Sorry. Do I did something bad? I wasn't intended to.. I didn't think that
> trimming was a bad idea, I just want to reinforce the book suggestion ...
> Sorry
It's OK.. just remember to trim out the non-important stuff next time. :)
On Wed, 18 Jul 2018 14:29:41 -0700, Dave Stevens said:
> On Wed, 18 Jul 2018 18:19:05 -0300 "Daniel." wrote:
>
> > > Hi Athul...
> > > This is my collegemate's writing, ... This will solve all your
> > > confusions
> > >
>
> is it the policy on this list to trim?
Only the irrelevant parts,
On Tue, 17 Jul 2018 21:10:05 -0700, Dave Stevens said:
> $ make help
> make: *** No rule to make target 'help'. Stop.
Were you cd'ed into the directory that had the base of the kernel source tree?
Hint: the directory should look something like this:
[/usr/src/linux-next] ls
COPYING
On Tue, 17 Jul 2018 18:35:15 +0530, jitendra kumar khasdev said:
> Can netpoll apis send data over the internet. It worked for me in local
> network but when I try to send data over server which is in cloud not able
> to send it.
>
> Can anybody help me out ?
If it works over the local net, time
On Tue, 17 Jul 2018 02:15:17 -, David Frank said:
> inking. I'm checking out if the flag does what is is said to do-- I don't
> have
> to call msync function, which would boost performance.
Note that this can actually *kill* performance, because this means that the
kernel has to flush to
On Tue, 17 Jul 2018 00:57:31 -, David Frank said:
> I installed LTS 18.04 with headers. I'm trying to use the new flag MAP_SYNC
> with mmap call, but it complained MAP_SYNC undefined.What #define do I need to
> enable this?
You need more than a #define. You need a 4.15 kernel and matching
On Sat, 14 Jul 2018 22:07:12 +0400, oz...@goosey.org said:
> LFS is a good places to prepare a new linux distribution and have fun as you
> talk about :)
Note that *building* a LFS system is a bit of work.
Properly *maintaining* an LFS system is an ongoing *ton* of work. Basically,
you end up
On Fri, 13 Jul 2018 11:02:13 +0800, bing zhu said:
> Iâm trying to write a simple fs in user space,if memcpy is slower than
> kernel , i think it's unfair,as for only cpu for my task,
> it's a bit of arbitrary ï¼i just want my task not interrupted during a
> specific time is that possible ?
On Thu, 12 Jul 2018 20:33:32 -, David Frank said:
> I got it from hereHow To Install Kernel 4.15 RC7 on Ubuntu, Linux Mint,
> Elementary OS And Other Ubuntu Derivatives | LinuxG.net
Looks like you got the linux-image-... .deb but didn't do the linux-headers-...
.deb(s).
(And I have no
On Thu, 12 Jul 2018 20:10:36 -, David Frank said:
> Thanks Valdis.Looks like the failure is that I can not write to a 2GB buffer
> (char bf[2GB size]).Where do I get the distro include file?
>From the same exact place you got the distro kernel from. (I'm guessing
it's a distro kernel from
On Thu, 12 Jul 2018 18:44:43 -, David Frank said:
> Hi,How do I enable the MAP_SYNC flag in mmap for linux 4.15, my code does not
> compile with that flag on linux 4.15.0-041500rc7-generic #201801072330
Get your distro to ship an update to /usr/include/linux (kernel-headers) that
contains
On Thu, 12 Jul 2018 22:27:37 +0800, bing zhu said:
> as for memcpy ,kernel is faster than user ,might because schedule ,can i
> try to make user as fast as kernel ?
Do you have an actual issue where the difference in speed of these two
things makes a difference? Or is this primarily a mental
On Tue, 10 Jul 2018 22:51:34 +0800, bing zhu said:
> Thank you ,I use this func for both kernel and user ,result are same.
> void *memcpy(void *dest, const void *src, size_t n)
> {
Might want to use 'void *my_memcpy(..)' instead, just in case the build
environment plays #define games with you
On Tue, 10 Jul 2018 12:08:25 +0530, Sriram said:
> I m working on linux-3.12.19 kernel.
You have our condolences. Note that the fix for your problem has
probably already been found, somewhere in the millions of lines of
changes since then.
[/usr/src/linux-next] git diff --shortstat v3.12
On Tue, 10 Jul 2018 09:42:03 +1000, "Tobin C. Harding" said:
> I was under the impression that each maintainer constantly rebased their
> next branches and that was why one has to checkout the tagged linux-next
> each day instead of just pulling.
Close, but no cigar. The maintainers don't
On Mon, 09 Jul 2018 09:30:51 -0400, Ruben Safir said:
> On 07/08/2018 04:44 PM, valdis.kletni...@vt.edu wrote:
> > Error while parsing statement., What is a "filesystem bus" and when does it
> > issue a HW interrupt?
> You have a hard drive on the system bus and it sends interupts...
That's
On Mon, 09 Jul 2018 19:34:44 +0530, Himanshu Jha said:
> I think for these benchmarking stuff, to evaluate the cycles and time
> correctly you should use the __rdtscp(more info at "AMD64 Architecture
> Programmerâs Manual Volume 3: General-Purpose and System Instructions"
> Pg 401)
Just beware
On Sun, 08 Jul 2018 15:46:32 -0400, Ruben Safir said:
> What are you saying? That is the filesystem bus sends a HW interupt on
Error while parsing statement., What is a "filesystem bus" and when does it
issue a HW interrupt?
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On Sun, 08 Jul 2018 11:21:08 +0530, inventsekar said:
> I read this page few times but I am unable to understand what's Linus's
> idea..Why he disagree ...
> whether the Linux kernel should include code that makes it easier to boot
> Linux on Windows PCs.
The issue is "trusted boot", and it
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