Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

__blk_run_queue(9) [centos man page]

__BLK_RUN_QUEUE(9)						   Block Devices						__BLK_RUN_QUEUE(9)

__blk_run_queue - run a single device queue SYNOPSIS
void __blk_run_queue(struct request_queue * q); ARGUMENTS
q The queue to run DESCRIPTION
See blk_run_queue. This variant must be called with the queue lock held and interrupts disabled. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 __BLK_RUN_QUEUE(9)

Check Out this Related Man Page

RUNQUEUE(9)						   BSD Kernel Developer's Manual					       RUNQUEUE(9)

choosethread, procrunnable, remrunqueue, setrunqueue -- manage the queue of runnable processes SYNOPSIS
#include <sys/param.h> #include <sys/proc.h> extern struct rq itqueues[]; extern struct rq rtqueues[]; extern struct rq queues[]; extern struct rq idqueues[]; struct thread * choosethread(void); int procrunnable(void); void remrunqueue(struct thread *td); void setrunqueue(struct thread *td); DESCRIPTION
The run queue consists of four priority queues: itqueues for interrupt threads, rtqueues for realtime priority processes, queues for time sharing processes, and idqueues for idle priority processes. Each priority queue consists of an array of NQS queue header structures. Each queue header identifies a list of runnable processes of equal priority. Each queue also has a single word that contains a bit mask identify- ing non-empty queues to assist in selecting a process quickly. These are named itqueuebits, rtqueuebits, queuebits, and idqueuebits. The run queues are protected by the sched_lock mutex. procrunnable() returns zero if there are no runnable processes other than the idle process. If there is at least one runnable process other than the idle process, it will return a non-zero value. Note that the sched_lock mutex does not need to be held when this function is called. There is a small race window where one CPU may place a process on the run queue when there are currently no other runnable processes while another CPU is calling this function. In that case the second CPU will simply travel through the idle loop one additional time before noticing that there is a runnable process. This works because idle CPUs are not halted in SMP systems. If idle CPUs are halted in SMP sys- tems, then this race condition might have more serious repercussions in the losing case, and procrunnable() may have to require that the sched_lock mutex be acquired. choosethread() returns the highest priority runnable thread. If there are no runnable threads, then the idle thread is returned. This func- tion is called by cpu_switch() and cpu_throw() to determine which thread to switch to. choosethread() must be called with the sched_lock mutex held. setrunqueue() adds the thread td to the tail of the appropriate queue in the proper priority queue. The thread must be runnable, i.e. p_stat must be set to SRUN. This function must be called with the sched_lock mutex held. remrunqueue() removes thread td from its run queue. If td is not on a run queue, then the kernel will panic(9). This function must be called with the sched_lock mutex held. SEE ALSO
cpu_switch(9), scheduler(9), sleepqueue(9) BSD
August 15, 2010 BSD
Man Page

15 More Discussions You Might Find Interesting

1. Fedora

Is UNIX an open source OS ?

Hi everyone, I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX. Ok onto business, my questions are-: Was/Is UNIX ever an open source operating system ? If UNIX was... (21 Replies)
Discussion started by: sreyan32
21 Replies

2. UNIX for Beginners Questions & Answers

Weird 'find' results

Hello and thanks in advance for any help anyone can offer me I'm trying to learn the find command and thought I was understanding it... Apparently I was wrong. I was doing compound searches and I started getting weird results with the -size test. I was trying to do a search on a 1G file owned by... (14 Replies)
Discussion started by: bodisha
14 Replies

3. UNIX for Beginners Questions & Answers

Set hard block limit for user using quota

hi all, i have installed quota on my centos 7 machine and its what im after (setting size limit on users, so they cant fill the hard drive) i want to now make this part of my create user script for my sftp server so i want to do a echo and a read command so i capture the limit they enter... (0 Replies)
Discussion started by: robertkwild
0 Replies

4. UNIX for Beginners Questions & Answers

Best performance UNIX just for HOST Virtualization?

Hi everybody, Which Unix base OS have best performance for HOST virtualization? I tested SmartOS but it needs another OS to connect remotely! Thanks in advance. (11 Replies)
Discussion started by: mbzadegan
11 Replies

5. UNIX for Beginners Questions & Answers

How to increment version inside a file?

Hi All, I need to write a shell script which opens a file and increments the version(text) within the file every time the script runs. For example: $ cat docker_file.yml version: '3.1' services: ui: image: $ So, I would like... (6 Replies)
Discussion started by: akshayupadhayay
6 Replies

6. Programming

DB2 convert digits to binary format

Dear Team We use DB2 v10.5 and using DBArtisan tool Can someone please guide how to convert digits to binary numbers using db2 feature. Ex> for number 9 , binary should be 1001 ( 8+1) Any help appreciated. Thanks (2 Replies)
Discussion started by: Perlbaby
2 Replies

7. UNIX for Advanced & Expert Users

Tar Command

hi folks, how to using tar with exclude directory and compress it using tar.Z i only know how to exclude dir only with this command below: tar -cvf /varios/restore/test.tar -X excludefile.txt /jfma/test1/ how to compress it using 1 command? Thanx Please use CODE tags as... (6 Replies)
Discussion started by: only
6 Replies

8. UNIX for Advanced & Expert Users

CentOS7 restoring file capabilities

Quite an obscure question I think. We have a rebuild process for remote sites that allows us to PXE rebuild a till (actually a PC with a touch screen and various fancy bits) running CentOS. The current CentOS5 tills work just fine with a tar image restore and some personalisation. Sadly,... (4 Replies)
Discussion started by: rbatte1
4 Replies

9. Docker

Docker learning Phase-I

Hello All, I had recently learnt a bit of Docker(which provides containerization process). Here are some of my learning points from it. Let us start first with very basic question: What is Docker: Docker is a platform for sysadmins and developers to DEPLOY, DEVELOP and RUN applications ... (7 Replies)
Discussion started by: RavinderSingh13
7 Replies

10. UNIX for Advanced & Expert Users

Shopt -s histappend

What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file. # When the shell exits, append to the history file instead of overwriting it shopt -s histappend (3 Replies)
Discussion started by: cokedude
3 Replies

11. UNIX for Beginners Questions & Answers

Unsure why access time on a directory change isn't changing

Hello... And thanks in advance for any help anyone can offer me I was trying to work out the differences between displaying modify, access, and change times with the 'ls' command. Everything seems in order when I look at files, but the access time on a directory doesn't seem to change when I... (4 Replies)
Discussion started by: bodisha
4 Replies

12. UNIX for Beginners Questions & Answers

CentOS 6 ran out of space, need to reclaim it

Hello everyone, I am having an issue here with CentOS release 6.6 (Final) that shows all of the space used up, but I can't tell where the space went. Seemingly I am using up 100%, according to df -h Filesystem Size Used Avail Use% Mounted on... (27 Replies)
Discussion started by: DannyBoyCentOS
27 Replies

13. Shell Programming and Scripting

Controlling user input

I'm trying to use a bash script for a psych experiment that involves listening to sound files and responding. If I have something like the code below, how can I make sure that a key press is assigned to RESPONSE only after the second echo statement? for i in 1 2 3; do echo "Ready?" sleep 2 ... (10 Replies)
Discussion started by: darwin_886
10 Replies

14. Shell Programming and Scripting

[TIP] Processing YAML files with yq

After the success of the jq - tool for parsing and manipulating JSON-Data someone wrote a tool called yq, which aims to be the same for YAML, what jq is for JSON. Seems to work fine. I'll definitely give it a chance in future. Example YAML-File: --- !ruby/object:Puppet::Node::Facts ... (1 Reply)
Discussion started by: stomp
1 Replies

15. What is on Your Mind?

Please Welcome Dave Munro to the Moderator Team!

Dear All, I am very pleased to announce that Dave Munro (gull04) is joining the Moderation Team, after being a very valuable member of for 15+ years. Dave is an IT Consultant with 30 years of experience this year, has worked in many of the industry vertical market segments and has... (6 Replies)
Discussion started by: Neo
6 Replies