kernel_samsung_sm7125

jenna

History

David Rientjes 2ff05b2b4e oom: move oom_adj value from task_struct to mm_struct The per-task oom_adj value is a characteristic of its mm more than the task itself since it's not possible to oom kill any thread that shares the mm. If a task were to be killed while attached to an mm that could not be freed because another thread were set to OOM_DISABLE, it would have needlessly been terminated since there is no potential for future memory freeing. This patch moves oomkilladj (now more appropriately named oom_adj) from struct task_struct to struct mm_struct. This requires task_lock() on a task to check its oom_adj value to protect against exec, but it's already necessary to take the lock when dereferencing the mm to find the total VM size for the badness heuristic. This fixes a livelock if the oom killer chooses a task and another thread sharing the same memory has an oom_adj value of OOM_DISABLE. This occurs because oom_kill_task() repeatedly returns 1 and refuses to kill the chosen task while select_bad_process() will repeatedly choose the same task during the next retry. Taking task_lock() in select_bad_process() to check for OOM_DISABLE and in oom_kill_task() to check for threads sharing the same memory will be removed in the next patch in this series where it will no longer be necessary. Writing to /proc/pid/oom_adj for a kthread will now return -EINVAL since these threads are immune from oom killing already. They simply report an oom_adj value of OOM_DISABLE. Cc: Nick Piggin <npiggin@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		16 years ago
..
Kconfig	…
Makefile	proc: remove fs/proc/proc_misc.c	17 years ago
array.c	proc: avoid information leaks to non-privileged processes	16 years ago
base.c	oom: move oom_adj value from task_struct to mm_struct	16 years ago
cmdline.c	proc: switch /proc/cmdline to seq_file	17 years ago
cpuinfo.c	proc: move /proc/cpuinfo code to fs/proc/cpuinfo.c	17 years ago
devices.c	proc: move /proc/devices code to fs/proc/devices.c	17 years ago
generic.c	proc 1/2: do PDE usecounting even for ->read_proc, ->write_proc	16 years ago
inode.c	proc 2/2: remove struct proc_dir_entry::owner	16 years ago
internal.h	Move junk from proc_fs.h to fs/proc/internal.h	16 years ago
interrupts.c	proc: move /proc/interrupts boilerplate code to fs/proc/interrupts.c	17 years ago
kcore.c	proc: move all /proc/kcore stuff to fs/proc/kcore.c	17 years ago
kmsg.c	proc: move /proc/kmsg creation to fs/proc/kmsg.c	17 years ago
loadavg.c	sched, timers: cleanup avenrun users	16 years ago
meminfo.c	mm: remove CONFIG_UNEVICTABLE_LRU config option	16 years ago
mmu.c	…
nommu.c	trivial: fix typo "kernal" -> "kernel"	16 years ago
page.c	mm: remove CONFIG_UNEVICTABLE_LRU config option	16 years ago
proc_devtree.c	Move junk from proc_fs.h to fs/proc/internal.h	16 years ago
proc_net.c	proc: stop using BKL	16 years ago
proc_sysctl.c	constify dentry_operations: procfs	16 years ago
proc_tty.c	proc tty: remove struct tty_operations::read_proc	16 years ago
root.c	Convert obvious places to deactivate_locked_super()	16 years ago
stat.c	[S390] /proc/stat idle field for idle cpus	16 years ago
task_mmu.c	pagemap: require aligned-length, non-null reads of /proc/pid/pagemap	16 years ago
task_nommu.c	nommu: fix typo vma->pg_off to vma->vm_pgoff	16 years ago
uptime.c	Revert "proc: revert /proc/uptime to ->read_proc hook"	16 years ago
version.c	proc: switch /proc/version to seq_file	17 years ago
vmcore.c	vmcore: remove saved_max_pfn check	16 years ago