August 2012 - kernelnewbies@kernelnewbies.org

Re: How to allocate hugepage in kernel module?
by Murali Annamneni Aug. 12, 2012

Aug. 12, 2012

Hi, You can try by passing the flag GFP_KERNEL to __get_free_pages(). Eg: __get_free_pages(GFP_KERNEL,9) where "9" represents - Order of 9; means requesting for 2^9(=512) contiguous pages in virtual address space in order to allocate 2MB of contiguous memory. Thanks & Regards Murali -----Original Message----- From: kernelnewbies-bounces(a)kernelnewbies.org [mailto:kernelnewbies-bounces@kernelnewbies.org] On Behalf Of kernelnewbies-request(a)kernelnewbies.org Sent: Friday, August 10, 2012 9:30 PM To: kernelnewbies(a)kernelnewbies.org Subject: Kernelnewbies Digest, Vol 21, Issue 13 Send Kernelnewbies mailing list submissions to kernelnewbies(a)kernelnewbies.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies or, via email, send a message with subject or body 'help' to kernelnewbies-request(a)kernelnewbies.org You can reach the person managing the list at kernelnewbies-owner(a)kernelnewbies.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Kernelnewbies digest..." Today's Topics: 1. Re: How to allocate hugepage in kernel module? (J.Hwan Kim) 2. Re: How to allocate hugepage in kernel module? (anish kumar) ---------------------------------------------------------------------- Message: 1 Date: Fri, 10 Aug 2012 09:00:12 +0900 From: "J.Hwan Kim" <frog1120(a)gmail.com> Subject: Re: How to allocate hugepage in kernel module? To: Denis Kirjanov <kirjanov(a)gmail.com> Cc: kernelnewbies(a)kernelnewbies.org Message-ID: <50244F0C.90109(a)gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed I set the __GFP_COMP flag to __get_free_pages(), but the result was same. 2012? 08? 09? 17:59, Denis Kirjanov ? ?: > Forgot to CC kernelnewbies: > > Did you pass the __GFP_COMP flag to __get_free_pages? > > > On 8/9/12, J.Hwan Kim<frog1120(a)gmail.com> wrote: >> Hi, everyone >> >> How can I allocate physically contiguous huge page in kernel module ? >> The routine of _get_fee_pages() fails whenever there are much free >> memory in system. >> >> I found the procedures for set hugepages with sysctl or >> /proc/sys/vm/nr_hugepages but I've not found the api for allocate the >> huge page in kernel. >> >> Thanks in advnace. >> >> Best Regards, >> J.Hwan Kim >> >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies(a)kernelnewbies.org >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > ------------------------------ Message: 2 Date: Thu, 09 Aug 2012 20:18:02 -0700 From: anish kumar <anish198519851985(a)gmail.com> Subject: Re: How to allocate hugepage in kernel module? To: "J.Hwan Kim" <frog1120(a)gmail.com> Cc: Denis Kirjanov <kirjanov(a)gmail.com>, kernelnewbies(a)kernelnewbies.org Message-ID: <1344568682.1532.30.camel@anish-Inspiron-N5050> Content-Type: text/plain; charset="UTF-8" On Fri, 2012-08-10 at 09:00 +0900, J.Hwan Kim wrote: > I set the __GFP_COMP flag to __get_free_pages(), but the result was > same. Does this help? sourd/core/memalloc.c +170 > 2012? 08? 09? 17:59, Denis Kirjanov ? ?: > > Forgot to CC kernelnewbies: > > > > Did you pass the __GFP_COMP flag to __get_free_pages? > > > > > > On 8/9/12, J.Hwan Kim<frog1120(a)gmail.com> wrote: > >> Hi, everyone > >> > >> How can I allocate physically contiguous huge page in kernel module ? > >> The routine of _get_fee_pages() fails whenever there are much free > >> memory in system. > >> > >> I found the procedures for set hugepages with sysctl or > >> /proc/sys/vm/nr_hugepages but I've not found the api for allocate > >> the huge page in kernel. > >> > >> Thanks in advnace. > >> > >> Best Regards, > >> J.Hwan Kim > >> > >> > >> > >> _______________________________________________ > >> Kernelnewbies mailing list > >> Kernelnewbies(a)kernelnewbies.org > >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > >> > > > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies(a)kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ------------------------------ _______________________________________________ Kernelnewbies mailing list Kernelnewbies(a)kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies End of Kernelnewbies Digest, Vol 21, Issue 13 ********************************************* ::DISCLAIMER:: ---------------------------------------------------------------------------------------------------------------------------------------------------- The contents of this e-mail and any attachment(s) are confidential and intended for the named recipient(s) only. E-mail transmission is not guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or may contain viruses in transmission. The e mail and its contents (with or without referred errors) shall therefore not attach any liability on the originator or HCL or its affiliates. Views or opinions, if any, presented in this email are solely those of the author and may not necessarily reflect the views or opinions of HCL or its affiliates. Any form of reproduction, dissemination, copying, disclosure, modification, distribution and / or publication of this message without the prior written consent of authorized representative of HCL is strictly prohibited. If you have received this email in error please delete it and notify the sender immediately. Before opening any email and/or attachments, please check them for viruses and other defects. ----------------------------------------------------------------------------------------------------------------------------------------------------

1 0

How to allocate hugepage in kernel module?
by J.Hwan Kim Aug. 10, 2012

Aug. 10, 2012

Hi, everyone How can I allocate physically contiguous huge page in kernel module ? The routine of _get_fee_pages() fails whenever there are much free memory in system. I found the procedures for set hugepages with sysctl or /proc/sys/vm/nr_hugepages but I've not found the api for allocate the huge page in kernel. Thanks in advnace. Best Regards, J.Hwan Kim

3 3

AMD PowerNow! driver for AMD Bulldozer architecture cpu
by liunx Aug. 9, 2012

Aug. 9, 2012

Hello, I have a AMD FX6100 cpu, and I wondered that is there a need to write a PowerNow! driver for the cpu? Any tips, please? regards

1 0

Regarding Ethernet support for kernel 3.4.7 debugging via KGDB‏‏
by Vivek Panwar Aug. 9, 2012

Aug. 9, 2012

Hi, I am making a set up for kernel debugging at remote location with the help of ethernet, but as i heard that we dont have ethernet support in kernel 3.x series , Is it true? If yes so do we have any other option to enable the ethernet functionality. I have downloaded the latest 3.6.7 kernel to my ubuntu 11.04 64 bit machine and booted my machine with this new kernel successfully but the problem is that i dont have ethernet support in this for debugging via KGDB. I am a beginner in this field, so can you please help me out in this if possible. Thanks for your support Thanks Vivek

3 4

Re: what's the differences among vairous memory models?
by Mulyadi Santosa Aug. 8, 2012

Aug. 8, 2012

Hi Permenides.... On Wed, Aug 8, 2012 at 9:22 PM, Parmenides <mobile.parmenides(a)gmail.com> wrote: > Hi Mulyadi, > > Thanks for your reply. In principle, the physical memory > management model can be used for both UMA and NUMA, because we can > view UMA as a special case of NUMA. agree... :) >But, in kernel code, there is some > points like > > #ifdef CONFIG_NUMA > ....... > > So, I wonder there must be some differences between UMA and NUMA. maybe this page can explain much much better than me: http://mytechkorner.blogspot.com/2010/12/sparsemem.html not sure, but it seems that sparsemem indeed targetting to handle NUMA. And also memory hotplug...maybe that is the "hole" you refer to. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com

1 0

first block in ext3 filesystem
by Prashant Shah Aug. 8, 2012

Aug. 8, 2012

Hi, I came across this $sudo dumpe2fs /dev/sda1 4KB Block Size Group 0: (Blocks 0-32767) Primary superblock at 0, Group descriptors at 1-1 1KB Block Size Group 0: (Blocks 1-8192) Primary superblock at 1, Group descriptors at 2-2 Why does first block start from 0 in the 4KB block size partition and 1 in 1KB block size partition ? Regards.

4 4

Powernow! for amd fx cpu?
by liunx Aug. 7, 2012

Aug. 7, 2012

hello, I have a amd fx6100 cpu, I see that there is powernow-k8 module to support amd k8 series cpus, but is it enough for amd fx series cpus? Is there a need to write a powernow module for it? regards

1 0

what's the differences among vairous memory models?
by Parmenides Aug. 7, 2012

Aug. 7, 2012

It is said that there are three memory models，namely FLATMEM，DISCONTIGMEM and SPARSEMEM。What's the differences among them? Thx!

2 1

(no subject)
by 梨落 Aug. 6, 2012

Aug. 6, 2012

hello i want to sabrit the mailist

2 1

why online shrink is not supported in EXT4_IOC_RESIZE_FS ioctl?
by raphel johnson Aug. 6, 2012

Aug. 6, 2012

Hi, I referred EXT4_IOC_RESIZE_FS ioctl implementation in linux kernel ver 3.3.8. Implementation specifies tht Online shrinking is not supported. Code is as below. if (n_blocks_count < o_blocks_count) { /* On-line shrinking not supported */ ext4_warning(sb, "can't shrink FS - resize aborted"); return -EINVAL; } Can anyone please tell the reason why online shrinking is not supported. Thanks in adavance. Regards, Raphel

1 0