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I'm trying to understand the difference between o_direct flag of open system call and dax (direct access) with ext4 filesystem.

According to my understanding both bypass page cache.

But I'm...

I'm trying to benchmark a RAID-6 server using FFSB and the result is really unstable to detect the pattern.

Scenario -1:

Block-size - 65536 (64KB)
Number of threads - 10
Number of files - 10...

I wrote this kernel module to test the correctness of ndelay() function.

Kernel mdoule:

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/time.h>...

I did not understand your response.

---------- Post updated at 05:46 PM ---------- Previous update was at 05:05 PM ----------

I got my answer thank you. I've figured out myself.

I have applied a patch using this command:

patch -p1 < (file)

then I did git commit -a.

Now I want to recompile the kernel for making this patch live.

Should I use

make oldconfig
...

I have found many source files in the kernel using goto keyword instead of just doing the actual thing. For example:

if(blah)
goto x;
--
--
--
--
--

x: return blah-blah

Is there any...

But I'm unable to find linux-tools-generic here:
https://launchpad.net/ubuntu/xenial/+package/linux-tools-4.4.0-1-generic


When I'm trying to do from this website:...

I have installed this:

linux-tools-common 4.4.0-6.21

from this website:
Ubuntu (http://packages.ubuntu.com/xenial/all/linux-tools-common/download)

It says that it is successfully installed....

I'm not able to run perf on linux 4.4. I'm using ubuntu 15.10.

The error I'm getting is:

WARNING: perf not found for kernel 4.4.0

You may need to install the following packages for this...

Hi,

I'm trying to record metrics for an application called memcached. The procedure that I followed is:

1) Start the server using this command:
memcached -t 4 -m 4096 -n 550

2) Start the...

You are really awesome. Saved my day. Implemented this perfectly.

---------- Post updated at 03:47 PM ---------- Previous update was at 02:59 PM ----------

I have an other problem. I'm trying...

declare -a array=( "LLC-load-misses" "LLC-loads" "LLC-store-misses" "LLC-stores" "branch-load-misses" "branch-loads" "dTLB-load-misses" "dTLB-loads" "dTLB-store-misses" "dTLB-stores"...