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authorIngo Molnar <mingo@elte.hu>2008-08-13 18:02:18 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-15 11:45:19 -0700
commitcd98a04a59e2f94fa64d5bf1e26498d27427d5e7 (patch)
treea6e9c7996612e52eb4ac2dc0d03046120965efc1 /drivers/hwmon
parent45edb89ffd6386f95a7a9e1e5461b0e61c76aa14 (diff)
x86: add MAP_STACK mmap flag
as per this discussion: http://lkml.org/lkml/2008/8/12/423 Pardo reported that 64-bit threaded apps, if their stacks exceed the combined size of ~4GB, slow down drastically in pthread_create() - because glibc uses MAP_32BIT to allocate the stacks. The use of MAP_32BIT is a legacy hack - to speed up context switching on certain early model 64-bit P4 CPUs. So introduce a new flag to be used by glibc instead, to not constrain 64-bit apps like this. glibc can switch to this new flag straight away - it will be ignored by the kernel. If those old CPUs ever matter to anyone, support for it can be implemented. Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Ulrich Drepper <drepper@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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