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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	[PATCH] Swapless page migration: modify core logic	19 years ago
Makefile	[PATCH] uninline zone helpers	19 years ago
bootmem.c	[PATCH] x86_64: Handle empty PXMs that only contain hotplug memory	19 years ago
fadvise.c	[PATCH] sys_sync_file_range()	19 years ago
filemap.c	[PATCH] readahead: backoff on I/O error	19 years ago
filemap.h	[PATCH] Prepare for __copy_from_user_inatomic to not zero missed bytes	19 years ago
filemap_xip.c	[PATCH] replace inode_update_time with file_update_time	19 years ago
fremap.c	[PATCH] fix update_mmu_cache in fremap.c	19 years ago
highmem.c	BUG_ON() Conversion in mm/highmem.c	19 years ago
hugetlb.c	[PATCH] tightening hugetlb strict accounting	19 years ago
internal.h	[PATCH] remove set_page_count() outside mm/	19 years ago
madvise.c	[PATCH] Fix MADV_REMOVE protection checking	19 years ago
memory.c	[PATCH] add page_mkwrite() vm_operations method	19 years ago
memory_hotplug.c	[PATCH] update vm_total_pages at memory hotadd	19 years ago
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	[PATCH] Allow migration of mlocked pages	19 years ago
mincore.c	…
mlock.c	[PATCH] move capable() to capability.h	19 years ago
mmap.c	[PATCH] add page_mkwrite() vm_operations method	19 years ago
mmzone.c	[PATCH] uninline zone helpers	19 years ago
mprotect.c	[PATCH] add page_mkwrite() vm_operations method	19 years ago
mremap.c	[PATCH] move capable() to capability.h	19 years ago
msync.c	[PATCH] Kill PF_SYNCWRITE flag	19 years ago
nommu.c	[PATCH] overcommit: use totalreserve_pages for nommu	19 years ago
oom_kill.c	[PATCH] mm: fix typos in comments in mm/oom_kill.c	19 years ago
page-writeback.c	[PATCH] writeback: fix range handling	19 years ago
page_alloc.c	[PATCH] cpuset: remove extra cpuset_zone_allowed check in __alloc_pages	19 years ago
page_io.c	…
pdflush.c	[PATCH] pdflush: handle resume wakeups	19 years ago
prio_tree.c	…
readahead.c	[PATCH] kernel-doc: mm/readhead fixup	19 years ago
rmap.c	[PATCH] Allow migration of mlocked pages	19 years ago
shmem.c	Merge branch 'master' of /home/trondmy/kernel/linux-2.6/	19 years ago
slab.c	[PATCH] slab: kmalloc, kzalloc comments cleanup and fix	19 years ago
slob.c	[PATCH] mm/slob.c: for_each_possible_cpu(), not NR_CPUS	19 years ago
sparse.c	[PATCH] sparsemem: record nid during memory present	19 years ago
swap.c	[PATCH] core: use list_move()	19 years ago
swap_state.c	BUG_ON() Conversion in mm/swap_state.c	19 years ago
swapfile.c	[PATCH] read_mapping_page for address space	19 years ago
thrash.c	…
tiny-shmem.c	[PATCH] do_truncate() call fix in tiny-shmem.c	19 years ago
truncate.c	[PATCH] Remove semi-softlockup from invalidate_mapping_pages	19 years ago
util.c	[PATCH] slab: optimize constant-size kzalloc calls	19 years ago
vmalloc.c	[PATCH] mm: introduce remap_vmalloc_range()	19 years ago
vmscan.c	[PATCH] initialise total_memory() earlier	19 years ago