VMALLOC(9) Memory Management in Linux VMALLOC(9)NAME
vmalloc - allocate virtually contiguous memory
void * vmalloc(unsigned long size);
allocation size Allocate enough pages to cover size from the page level allocator and map them into contiguous kernel virtual space.
For tight control over page level allocator and protection flags use __vmalloc instead.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 VMALLOC(9)
Check Out this Related Man Page
KMALLOC_ARRAY(9) Memory Management in Linux KMALLOC_ARRAY(9)NAME
kmalloc_array - allocate memory for an array.
void * kmalloc_array(size_t n, size_t size, gfp_t flags);
number of elements.
the type of memory to allocate.
The flags argument may be one of:
GFP_USER - Allocate memory on behalf of user. May sleep.
GFP_KERNEL - Allocate normal kernel ram. May sleep.
GFP_ATOMIC - Allocation will not sleep. May use emergency pools. For example, use this inside interrupt handlers.
GFP_HIGHUSER - Allocate pages from high memory.
GFP_NOIO - Do not do any I/O at all while trying to get memory.
GFP_NOFS - Do not make any fs calls while trying to get memory.
GFP_NOWAIT - Allocation will not sleep.
__GFP_THISNODE - Allocate node-local memory only.
GFP_DMA - Allocation suitable for DMA. Should only be used for kmalloc caches. Otherwise, use a slab created with SLAB_DMA.
Also it is possible to set different flags by OR'ing in one or more of the following additional flags:
__GFP_COLD - Request cache-cold pages instead of trying to return cache-warm pages.
__GFP_HIGH - This allocation has high priority and may use emergency pools.
__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail (think twice before using).
__GFP_NORETRY - If memory is not immediately available, then give up at once.
__GFP_NOWARN - If allocation fails, don't issue any warnings.
__GFP_REPEAT - If allocation fails initially, try once more before failing.
There are other flags available as well, but these are not intended for general use, and so are not documented here. For a full list of
potential flags, always refer to linux/gfp.h.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 KMALLOC_ARRAY(9)
mail:/var/lib/named/proc # ls -l |grep kcore
-r-------- 1 root root 140737486266368 Jun 3 19:47 kcore
mail:/var/lib/named/proc # du -a |grep kcore
System is SuSE 11.2 SP1.
The system appears to run correctly, and the output of df -v shows the correct disk... (1 Reply)
Problem: High memory utilisation of one linux server, due to which a database crashed on the server.
My question to all: How does glance calculate that memory utilisation on the linux server is 98%.
I mean what components are part of (31.4gb-599mb)? How can i check that myself? Can... (3 Replies)
So I'm having a problem getting a Broadcom BCM4312 wireless controller to work under the broadcom-wl module
Linux 3.8.11-200.fc18.x86_64 #1 SMP Wed May 1 19:44:27 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
05:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g... (2 Replies)
I could not find what is consuming the memory, generated DSET reports and NO hardware wise memory issue. 64 GB RAM on a server yet all I could see is a very limited memory available. I am not sure if I am reading this correct or not. I have used free -t -m and cat /proc/meminfo (results below)... (3 Replies)
I'm writing a simple USB driver to drive a stepper motor based on USB Skeleton 2.2 Driver, kernel 3.8. The basic version is running properly. As a advancement, I introduced KTHREAD to call the DEVICE_WRITE (skel_write) (), so that the driver will be available for other tasks & requests.
Calling... (0 Replies)
This is RHEL 5.7. swap is almost full, but I am not sure, what to release and how to release space. This is production server so I would like to try all possible options before reboot.
top - 00:18:26 up 327 days, 7:01, 3 users, load average: 0.16, 0.21, 0.18
Tasks: 782 total, ... (7 Replies)
From the following /proc/meminfo output only ~2GB is free out of total 250GB, but Cached is 194630300 kB. My customer is concerned over the very little memory showing as free. Kindly shed some light if the free memory available in this situation is some thing we need to worry or can we take it as... (2 Replies)
I have Ubuntu 16.04 (dual boot with Windows 10) and a HP Spectre x360 laptop.
I have recently bought a Dell Ultrasharp U2515H monitor, which I connect via a Dell docking station.
When I plug the docking station to my laptop on Windows, both monitors are detected and everything works fine.
... (23 Replies)
In a bash script, I'm using kill -0 to test if I have permission to kill a process. There are 3 cases:
- the process exists and I have permission: OK
- the process doesn't exist and it's OK (because I decided to ignore processes that are already dead).
- I don't have permission and I want... (13 Replies)
I'm a new beginner to Linux kernel and curious about its memory management.
When multiple applications apply for memory space at the same time, how Linux kernel solve the resource contending problem for high performance?
I have known that there is a buddy system for allocating and... (4 Replies)
I'm a junior programmer. This is my first post here, please excuse me if that's not the correct place :)
For days now I've been trying to install Oracle DB 12c R2 on Ubuntu 18.04. I'm at my wits' end. The software itself installs fine and a Listener can be started but I can't start... (15 Replies)
I am running ubuntu 14.04 in a server with 32GB ram.
Due to receiving "high load" errors during ssh connection, I took a look at what's happening from command line. I detected that 20GB of total memory was allocated to a program.
Below you can see some initial part of installation... (4 Replies)
I'm a little embarrassed after all these years I've never really successfully compiled my own kernel. I used this guide to make the following files:
When I first booted into this... (4 Replies)