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Mel Gorman 5a6fe12595 Do not account for the address space used by hugetlbfs using VM_ACCOUNT ... When overcommit is disabled, the core VM accounts for pages used by anonymous shared, private mappings and special mappings. It keeps track of VMAs that should be accounted for with VM_ACCOUNT and VMAs that never had a reserve with VM_NORESERVE. Overcommit for hugetlbfs is much riskier than overcommit for base pages due to contiguity requirements. It avoids overcommiting on both shared and private mappings using reservation counters that are checked and updated during mmap(). This ensures (within limits) that hugepages exist in the future when faults occurs or it is too easy to applications to be SIGKILLed. As hugetlbfs makes its own reservations of a different unit to the base page size, VM_ACCOUNT should never be set. Even if the units were correct, we would double account for the usage in the core VM and hugetlbfs. VM_NORESERVE may be set because an application can request no reserves be made for hugetlbfs at the risk of getting killed later. With commit fc8744adc8, VM_NORESERVE and VM_ACCOUNT are getting unconditionally set for hugetlbfs-backed mappings. This breaks the accounting for both the core VM and hugetlbfs, can trigger an OOM storm when hugepage pools are too small lockups and corrupted counters otherwise are used. This patch brings hugetlbfs more in line with how the core VM treats VM_NORESERVE but prevents VM_ACCOUNT being set. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		16 years ago
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Makefile	…
compat.c	…
compat_mq.c	…
ipc_sysctl.c	ipc/ipc_sysctl.c: move the definition of ipc_auto_callback()	16 years ago
ipcns_notifier.c	ipc: do not use a negative value to re-enable msgmni automatic recomputing	17 years ago
mqueue.c	[CVE-2009-0029] System call wrappers part 26	16 years ago
msg.c	[CVE-2009-0029] System call wrappers part 24	16 years ago
msgutil.c	…
namespace.c	…
sem.c	[CVE-2009-0029] System call wrappers part 25	16 years ago
shm.c	Do not account for the address space used by hugetlbfs using VM_ACCOUNT	16 years ago
util.c	sanitize audit_ipc_set_perm()	16 years ago
util.h	ipc: get rid of ipc_lock_down()	17 years ago