user/sven/linux.git/kernel/exit.c, branch v2.6.12.2

[PATCH] timer exit cleanup

2005-06-17T17:03:50Z

Do all timer zapping in exit_itimers. Signed-off-by: Ingo Molnar Signed-off-by: Linus Torvalds

[patch] MCA recovery module undefined symbol fix

2005-05-03T20:58:17Z

The patch "MCA recovery improvements" added do_exit to mca_drv.c. That's fine when the mca recovery code is built in the kernel (CONFIG_IA64_MCA_RECOVERY=y) but breaks building the mca recovery code as a module (CONFIG_IA64_MCA_RECOVERY=m). Most users are currently building this as a module, as loading and unloading the module provides a very convenient way to turn on/off error recovery. This patch exports do_exit, so mca_drv.c can build as a module. Signed-off-by: Russ Anderson (rja@sgi.com) Signed-off-by: Tony Luck

[PATCH] make lots of things static

2005-05-01T15:59:29Z

Another large rollup of various patches from Adrian which make things static where they were needlessly exported. Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] DocBook: changes and extensions to the kernel documentation

2005-05-01T15:59:25Z

I have recompiled Linux kernel 2.6.11.5 documentation for me and our university students again. The documentation could be extended for more sources which are equipped by structured comments for recent 2.6 kernels. I have tried to proceed with that task. I have done that more times from 2.6.0 time and it gets boring to do same changes again and again. Linux kernel compiles after changes for i386 and ARM targets. I have added references to some more files into kernel-api book, I have added some section names as well. So please, check that changes do not break something and that categories are not too much skewed. I have changed kernel-doc to accept "fastcall" and "asmlinkage" words reserved by kernel convention. Most of the other changes are modifications in the comments to make kernel-doc happy, accept some parameters description and do not bail out on errors. Changed to @pid in the description, moved some #ifdef before comments to correct function to comments bindings, etc. You can see result of the modified documentation build at http://cmp.felk.cvut.cz/~pisa/linux/lkdb-2.6.11.tar.gz Some more sources are ready to be included into kernel-doc generated documentation. Sources has been added into kernel-api for now. Some more section names added and probably some more chaos introduced as result of quick cleanup work. Signed-off-by: Pavel Pisa Signed-off-by: Martin Waitz Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] convert that currently tests _NSIG directly to use valid_signal()

2005-05-01T15:59:14Z

Convert most of the current code that uses _NSIG directly to instead use valid_signal(). This avoids gcc -W warnings and off-by-one errors. Signed-off-by: Jesper Juhl Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Remove bogus BUG() in kernel/exit.c

2005-04-29T16:37:07Z

It's old sanity checking that may have been useful for debugging, but is just bogus these days. Noticed by Mattia Belletti.

[PATCH] reparent_to_init cleanup

2005-04-16T22:26:01Z

This patch hides reparent_to_init(). reparent_to_init() should only be called by daemonize(). Signed-off-by: Coywolf Qi Hunt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] cpusets - big numa cpu and memory placement

2005-03-10T01:06:39Z

This my cpuset patch, with the following changes in the last two weeks: 1) Updated to 2.6.8.1-mm1 2) [Simon Derr ] Fix new cpuset to begin empty, not copied from parent. Needed to avoid breaking exclusive property. 3) [Dinakar Guniguntala ] Finish initializing top cpuset from cpu_possible_map after smp_init() called. 4) [Paul Jackson ] Check on each call to __alloc_pages() if the current tasks cpuset mems_allowed has changed. Use a cpuset generation number, bumped on any cpuset memory placement change, to make this check efficient. Update the tasks mems_allowed from its cpuset, if the cpuset has changed. 5) [Paul Jackson ] If a task is moved to another cpuset, then update its cpus_allowed, using set_cpus_allowed(). 6) [Paul Jackson ] Update Documentation/cpusets.txt to reflect above changes (4) and (5). I continue to recommend the following patch for inclusion in your 2.6.9-*mm series, when that opens. It provides an important facility for high performance computing on large systems. Simon Derr of Bull (France) and myself are the primary authors. Erich Focht has indicated that NEC is also a potential user of this patch on the TX-7 NUMA machines, and that he "would very much welcome the inclusion of cpusets." I offer this update to lkml, in order to invite continued feedback. The one prerequiste patch for this cpuset patch was just posted before this one. That was a patch to provide a new bitmap list format, of which cpusets is the first user. This patch has been built on top of 2.6.8.1-mm1, for the arch's: i386 x86_64 sparc ia64 powerpc-405 powerpc-750 sparc64 with and without CONFIG_CPUSET. It has been booted and tested on ia64 (sn2_defconfig, SN2 hardware). The 'alpha' arch also built, except for what seems to be an unrelated toolchain problem (crosstool ld sigsegv) in the final link step. === Cpusets provide a mechanism for assigning a set of CPUs and Memory Nodes to a set of tasks. Cpusets constrain the CPU and Memory placement of tasks to only the processor and memory resources within a tasks current cpuset. They form a nested hierarchy visible in a virtual file system. These are the essential hooks, beyond what is already present, required to manage dynamic job placement on large systems. Cpusets require small kernel hooks in init, exit, fork, mempolicy, sched_setaffinity, page_alloc and vmscan. And they require a "struct cpuset" pointer, a cpuset_mems_generation, and a "mems_allowed" nodemask_t (to go along with the "cpus_allowed" cpumask_t that's already there) in each task struct. These hooks: 1) establish and propagate cpusets, 2) enforce CPU placement in sched_setaffinity, 3) enforce Memory placement in mbind and sys_set_mempolicy, 4) restrict page allocation and scanning to mems_allowed, and 5) restrict migration and set_cpus_allowed to cpus_allowed. The other required hook, restricting task scheduling to CPUs in a tasks cpus_allowed mask, is already present. Cpusets extend the usefulness of, the existing placement support that was added to Linux 2.6 kernels: sched_setaffinity() for CPU placement, and mbind() and set_mempolicy() for memory placement. On smaller or dedicated use systems, the existing calls are often sufficient. On larger NUMA systems, running more than one, performance critical, job, it is necessary to be able to manage jobs in their entirety. This includes providing a job with exclusive CPU and memory that no other job can use, and being able to list all tasks currently in a cpuset. A given job running within a cpuset, would likely use the existing placement calls to manage its CPU and memory placement in more detail. Cpusets are named, nested sets of CPUs and Memory Nodes. Each cpuset is represented by a directory in the cpuset virtual file system, normally mounted at /dev/cpuset. Each cpuset directory provides the following files, which can be read and written: cpus: List of CPUs allowed to tasks in that cpuset. mems: List of Memory Nodes allowed to tasks in that cpuset. tasks: List of pid's of tasks in that cpuset. cpu_exclusive: Flag (0 or 1) - if set, cpuset has exclusive use of its CPUs (no sibling or cousin cpuset may overlap CPUs). mem_exclusive: Flag (0 or 1) - if set, cpuset has exclusive use of its Memory Nodes (no sibling or cousin may overlap). notify_on_release: Flag (0 or 1) - if set, then /sbin/cpuset_release_agent will be invoked, with the name (/dev/cpuset relative path) of that cpuset in argv[1], when the last user of it (task or child cpuset) goes away. This supports automatic cleanup of abandoned cpusets. In addition one new filetype is added to the /proc file system: /proc//cpuset: For each task (pid), list its cpuset path, relative to the root of the cpuset file system. This file is read-only. New cpusets are created using 'mkdir' (at the shell or in C). Old ones are removed using 'rmdir'. The above files are accessed using read(2) and write(2) system calls, or shell commands such as 'cat' and 'echo'. The CPUs and Memory Nodes in a given cpuset are always a subset of its parent. The root cpuset has all possible CPUs and Memory Nodes in the system. A cpuset may be exclusive (cpu or memory) only if its parent is similarly exclusive. See further Documentation/cpusets.txt, at the top of the following patch. /proc interface: It is useful, when learning and making new uses of cpusets and placement to be able to see what are the current value of a tasks cpus_allowed and mems_allowed, which are the actual placement used by the kernel scheduler and memory allocator. The cpus_allowed and mems_allowed values are needed by user space apps that are micromanaging placement, such as when moving an app to a obtained by that app within its cpuset using sched_setaffinity, mbind and set_mempolicy. The cpus_allowed value is also available via the sched_getaffinity system call. But since the entire rest of the cpuset API, including the display of mems_allowed added here, is via an ascii style presentation in /proc and /dev/cpuset, it is worth the extra couple lines of code to display cpus_allowed in the same way. This patch adds the display of these two fields to the 'status' file in the /proc/ directory of each task. The fields are only added if CONFIG_CPUSETS is enabled (which is also needed to define the mems_allowed field of each task). The new output lines look like: $ tail -2 /proc/1/status Cpus_allowed: ffffffff,ffffffff,ffffffff,ffffffff Mems_allowed: ffffffff,ffffffff Signed-off-by: Dinakar Guniguntala Signed-off-by: Paul Jackson Signed-off-by: Adrian Bunk Signed-off-by: Simon Derr Signed-off-by: Matt Mackall Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] make ITIMER_PROF, ITIMER_VIRTUAL per-process

2005-03-08T02:17:29Z

POSIX requires that setitimer, getitimer, and alarm work on a per-process basis. Currently, Linux implements these for individual threads. This patch fixes these semantics for the ITIMER_PROF timer (which generates SIGPROF) and the ITIMER_VIRTUAL timer (which generates SIGVTALRM), making them shared by all threads in a process (thread group). This patch should be applied after the one that fixes ITIMER_REAL. The essential machinery for these timers is tied into the new posix-timers code for process CPU clocks and timers. This patch requires the cputimers patch and its dependencies. Signed-off-by: Roland McGrath Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] make ITIMER_REAL per-process

2005-03-08T02:17:13Z

POSIX requires that setitimer, getitimer, and alarm work on a per-process basis. Currently, Linux implements these for individual threads. This patch fixes these semantics for the ITIMER_REAL timer (which generates SIGALRM), making it shared by all threads in a process (thread group). Signed-off-by: Roland McGrath Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds