Re: cgroups: cannot write on file memory.oom_control
Hi Rami, Thank you for the advice. Yes, I will try using the event handler. Best Regards, Hedi From: Rami Rosen roszenr...@gmail.com To: Hedi Boufaied hedi.boufa...@amadeus.com, Cc: kernelnewbies kernelnewbies@kernelnewbies.org Date: 18/04/2014 22:38 Subject:Re: cgroups: cannot write on file memory.oom_control Sent by:kernelnewbies-boun...@kernelnewbies.org Hi Hedi, Well, you can use disabling oom in conjunction with event handler. Thus, you can free memory by changing memory setting of other cgroups when an oom occurs in a specific cgroup, and avoid having an oops in that cgroup. You can see an example of using event handler in conjunction with disabling the oom killer in Namespaces and cgroups in linux, in slides 101/102, see: http://ramirose.wix.com/ramirosen A shameless plug - I wrote this presentation of 121 slides about namespaces and cgroups. Regards, Rami Rosen בתאריך 17 באפר 2014 11:24, Hedi Boufaied hedi.boufa...@amadeus.com כתב: Hi Rami, Thanks a lot for your sequence. I followed it and it does work. I now see my process paused in sleep state instead of getting killed when the cgroup reaches OoO. This being said: * I do not really understand why the use_hierarchy option needs to be disabled in order to allow disabling of the oom killer... * I'm not sure that disabling the OoO killer is safe/reliable enough: in some of the trials I made, I saw other processes (xterms) not part of the OoO cgroup getting completely stuck and I had to reboot my machine... Best Regards, Hedi From:Rami Rosen roszenr...@gmail.com To:Hedi Boufaied hedi.boufa...@amadeus.com, Cc:kernelnewbies kernelnewbies@kernelnewbies.org Date:15/04/2014 15:39 Subject:Re: cgroups: cannot write on file memory.oom_control Hi, Hedi, This sequence works for me: echo 0 /sys/fs/cgroup/memory/memory.use_hierarchy mkdir /sys/fs/cgroup/memory/0 Then, the following two commands changes the value of oom_kill_disable: echo 1/sys/fs/cgroup/memory/0/memory.oom_control echo 0/sys/fs/cgroup/memory/0/memory.oom_control For more info, please look for the text about enabling/disabling use_hierarchy in section 6, http://lxr.free-electrons.com/source/Documentation/cgroups/memory.txt. Regards, Rami Rosen http://ramirose.wix.com/ramirosen On Mon, Apr 14, 2014 at 12:22 PM, Hedi Boufaied hedi.boufa...@amadeus.com wrote: Hi everyone, I am working with cgroups on OpenSuse (over VirtualBox) and I cannot disable the OOM killer by writing to the file memory.oom_control: echo 1 memory.oom_control -bash: echo: write error: Invalid argument I can change the memory limit and several other settings by writing to the appropriate files (like memory.limit_in_bytes) but I could never write to file memory.oom_control although I am root. I saw someone posted a similar issue a few days ago but there was no reply... I have copied below the sequence of command I am using. Any idea what could be the issue ? Thanks in advance for your help! Hedi /sys/fs su - root /sys/fs cd cgroup /sys/fs/cgroup cgcreate -g memory:/mygroup /sys/fs/cgroup cd memory/mygroup /sys/fs/cgroup/memory/mygroup echo 32M memory.limit_in_bytes /sys/fs/cgroup/memory/mygroup cat memory.limit_in_bytes 33554432 /sys/fs/cgroup/memory/mygroup echo 1 memory.oom_control -bash: echo: write error: Invalid argument /sys/fs/cgroup/memory/mygroup cat memory.oom_control oom_kill_disable 0 under_oom 0 --- ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
pft not found for mmtest.
Hi all, May I know from where I can download pft. As pft is not found in http://mcp/mmtests-mirror/pft/ http://mcp/mmtests-mirror/pft//pft-0.12x.tar.gz and http://free.linux.hp.com/~lts/Tools/ http://free.linux.hp.com/%7Elts/Tools/pft-0.12x.tar.gz Log while running mmtest pft-install: Fetching from mirrorhttp://mcp/mmtests-mirror/pft//pft-0.12x.tar.gz http://mcp/mmtests-mirror/pft//pft-0.12x.tar.gz pft-install: Fetching from internethttp://free.linux.hp.com/~lts/Tools/pft-0.12x.tar.gz http://free.linux.hp.com/%7Elts/Tools/pft-0.12x.tar.gz FATAL pft-install: pft-install: Could not downloadhttp://free.linux.hp.com/~lts/Tools/pft-0.12x.tar.gz http://free.linux.hp.com/%7Elts/Tools/pft-0.12x.tar.gz FATAL pft-bench: pft install script returned error FATAL: pft returned failure, unable to continue test exit :: pft 255 Regards ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Kernel Projects
Hi, Does anybody know if there is a program to offer small (or big) kernel projects to students or someone who are interested in? I'm looking for programs like Google Summer of Code or http://kernelnewbies.org/KernelProjects I'm interested to contribute with kernel patches, but I don't know how and where to start it. I will be glad if someone give me ideas and/or suggestions. Thanks! *--* *Julio Cesar Faracco* *University of São Paulo - Brazil* ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel Projects
I would recommend: http://eudyptula-challenge.org/ On Tue, Apr 22, 2014 at 7:22 PM, Julio Faracco jcfara...@gmail.com wrote: Hi, Does anybody know if there is a program to offer small (or big) kernel projects to students or someone who are interested in? I'm looking for programs like Google Summer of Code or http://kernelnewbies.org/KernelProjects I'm interested to contribute with kernel patches, but I don't know how and where to start it. I will be glad if someone give me ideas and/or suggestions. Thanks! -- Julio Cesar Faracco University of São Paulo - Brazil ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies -- Peter ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel Projects
Hi Julio, Have you tried the Eudyptula Challenge? Its a good place to start from the ground up! Regards, Akshay Dixit On Tue, Apr 22, 2014 at 10:52 PM, Julio Faracco jcfara...@gmail.com wrote: Hi, Does anybody know if there is a program to offer small (or big) kernel projects to students or someone who are interested in? I'm looking for programs like Google Summer of Code or http://kernelnewbies.org/KernelProjects I'm interested to contribute with kernel patches, but I don't know how and where to start it. I will be glad if someone give me ideas and/or suggestions. Thanks! -- Julio Cesar Faracco University of São Paulo - Brazil ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel Projects
I second this, Eudyptula is one of most fun things Ive done in a lot of time I'm trying to find some time to finish task 16, but the real world keeps getting in my way :/ On Tue, Apr 22, 2014 at 2:29 PM, Akshay Dixit akshayd...@gmail.com wrote: Hi Julio, Have you tried the Eudyptula Challenge? Its a good place to start from the ground up! Regards, Akshay Dixit On Tue, Apr 22, 2014 at 10:52 PM, Julio Faracco jcfara...@gmail.com wrote: Hi, Does anybody know if there is a program to offer small (or big) kernel projects to students or someone who are interested in? I'm looking for programs like Google Summer of Code or http://kernelnewbies.org/KernelProjects I'm interested to contribute with kernel patches, but I don't know how and where to start it. I will be glad if someone give me ideas and/or suggestions. Thanks! -- Julio Cesar Faracco University of São Paulo - Brazil ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel Projects
I also sent a mail to lit...@eudyptula-challenge.org for joining the challenge but didn't received a conformation or a new challenge yet. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel Projects
Give it some time :-) Might take a couple hours to a day between replies. On Tue, Apr 22, 2014 at 2:55 PM, aaditya.gavandal...@yahoo.com aaditya.gavandal...@yahoo.com wrote: I also sent a mail to lit...@eudyptula-challenge.org for joining the challenge but didn't received a conformation or a new challenge yet. -- * From: * Vitor Braga vitorpybr...@gmail.com; * To: * Akshay Dixit akshayd...@gmail.com; * Cc: * Julio Faracco jcfara...@gmail.com; Kernelnewbies@kernelnewbies.org; * Subject: * Re: Kernel Projects * Sent: * Tue, Apr 22, 2014 5:39:06 PM I second this, Eudyptula is one of most fun things Ive done in a lot of time I'm trying to find some time to finish task 16, but the real world keeps getting in my way :/ On Tue, Apr 22, 2014 at 2:29 PM, Akshay Dixit akshayd...@gmail.com wrote: Hi Julio, Have you tried the Eudyptula Challenge? Its a good place to start from the ground up! Regards, Akshay Dixit On Tue, Apr 22, 2014 at 10:52 PM, Julio Faracco jcfara...@gmail.com wrote: Hi, Does anybody know if there is a program to offer small (or big) kernel projects to students or someone who are interested in? I'm looking for programs like Google Summer of Code or http://kernelnewbies.org/KernelProjects I'm interested to contribute with kernel patches, but I don't know how and where to start it. I will be glad if someone give me ideas and/or suggestions. Thanks! -- Julio Cesar Faracco University of São Paulo - Brazil ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel Projects
On Tue, Apr 22, 2014 at 1:22 PM, Julio Faracco jcfara...@gmail.com wrote: Hi, Does anybody know if there is a program to offer small (or big) kernel projects to students or someone who are interested in? I'm looking for programs like Google Summer of Code or http://kernelnewbies.org/KernelProjects I'm interested to contribute with kernel patches, but I don't know how and where to start it. I will be glad if someone give me ideas and/or suggestions. Thanks! -- Julio Cesar Faracco University of São Paulo - Brazil The challenge is probably a great learning experience, but I assume everyone is doing the same work? If so, Greg KH has said that code clean-ups to the staging directory are always accepted. Just download the kernel source, cd into the staging directory and start running checkpatch.pl against the various files. When you find issues, clean them up and submit a patch. Greg KH walks through the process here: https://www.youtube.com/watch?v=LLBrBBImJt4 Greg (not KH) ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Kernel Projects
On Tue, Apr 22, 2014 at 07:15:28PM -0400, Greg Freemyer wrote: If so, Greg KH has said that code clean-ups to the staging directory are always accepted. Yes, just start with drivers/staging/*/TODO and go from there. Help there is always gladly appreciated. thanks, greg (not Freemyer) k-h ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
a question about __nocache_pa macro
Hi, can someony explain this macro to me? It's in arch/sparc/include/asm/pgtsrmmu.h (linux 3.3) #define __nocache_pa(VADDR) (((unsigned long)VADDR) - SRMMU_NOCACHE_VADDR + __pa((unsigned long)srmmu_nocache_pool)) it looks like converting virtual address VADDR to physical address for which no cache is used. so I can see SRMMU_NOCACHE_VADDR is the virtual address start value from which no cache is used(in our case it's 0xc800), and VADDR is relative to this start location (thus the minus). But why do we add the last srmmu_nocache_pool term? we are adding the offset to physical nocache pool address. So it seems like it is converting a virtual address to a physcal address relative to nocache pool.. Why is it done this way? Thanks in advance. Chan ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
