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Eric W. Biederman 99f8955183 [PATCH] proc: don't lock task_structs indefinitely ... Every inode in /proc holds a reference to a struct task_struct. If a directory or file is opened and remains open after the the task exits this pinning continues. With 8K stacks on a 32bit machine the amount pinned per file descriptor is about 10K. Normally I would figure a reasonable per user process limit is about 100 processes. With 80 processes, with a 1000 file descriptors each I can trigger the 00M killer on a 32bit kernel, because I have pinned about 800MB of useless data. This patch replaces the struct task_struct pointer with a pointer to a struct task_ref which has a struct task_struct pointer. The so the pinning of dead tasks does not happen. The code now has to contend with the fact that the task may now exit at any time. Which is a little but not muh more complicated. With this change it takes about 1000 processes each opening up 1000 file descriptors before I can trigger the OOM killer. Much better. [mlp@google.com: task_mmu small fixes] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Paul Jackson <pj@sgi.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Albert Cahalan <acahalan@gmail.com> Signed-off-by: Prasanna Meda <mlp@google.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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Kconfig	…
Makefile	…
bootmem.c	[PATCH] x86_64: Handle empty PXMs that only contain hotplug memory	19 years ago
fadvise.c	…
filemap.c	…
filemap.h	…
filemap_xip.c	…
fremap.c	…
highmem.c	…
hugetlb.c	[PATCH] tightening hugetlb strict accounting	19 years ago
internal.h	…
madvise.c	…
memory.c	…
memory_hotplug.c	…
mempolicy.c	[PATCH] proc: don't lock task_structs indefinitely	19 years ago
mempool.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial	19 years ago
migrate.c	…
mincore.c	…
mlock.c	[PATCH] move capable() to capability.h	19 years ago
mmap.c	…
mmzone.c	…
mprotect.c	[PATCH] add page_mkwrite() vm_operations method	19 years ago
mremap.c	…
msync.c	…
nommu.c	…
oom_kill.c	…
page-writeback.c	…
page_alloc.c	…
page_io.c	…
pdflush.c	…
prio_tree.c	…
readahead.c	…
rmap.c	…
shmem.c	…
slab.c	…
slob.c	[PATCH] mm/slob.c: for_each_possible_cpu(), not NR_CPUS	19 years ago
sparse.c	…
swap.c	…
swap_state.c	…
swapfile.c	…
thrash.c	…
tiny-shmem.c	…
truncate.c	[PATCH] Remove semi-softlockup from invalidate_mapping_pages	19 years ago
util.c	…
vmalloc.c	…
vmscan.c	…