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Hint to kernel that thread stack memory can be removed.

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This commit is contained in:
Ulrich Drepper 2009-08-24 16:23:47 -07:00
parent 9a1ea1525e
commit b42a214c18
2 changed files with 30 additions and 11 deletions
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28
nptl/ChangeLog
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@ -1,3 +1,9 @@
2009-08-24 Ulrich Drepper <drepper@redhat.com>
* pthread_create.c (start_thread): Hint to the kernel that memory for
the stack can be reused. We do not mark all the memory. The part
still in use and some reserve are kept.
2009-08-23 Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/bits/posix_opt.h: Clean up namespace.
@ -1847,9 +1853,9 @@
* sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h: Include endian.h.
Split __flags into __flags, __shared, __pad1 and __pad2.
* sysdeps/unix/sysv/linux/sh/libc-lowlevellock.S: Use private
futexes if they are available.
futexes if they are available.
* sysdeps/unix/sysv/linux/sh/lowlevellock.S: Adjust so that change
in libc-lowlevellock.S allow using private futexes.
in libc-lowlevellock.S allow using private futexes.
* sysdeps/unix/sysv/linux/sh/lowlevellock.h: Define
FUTEX_PRIVATE_FLAG. Add additional parameter to lll_futex_wait,
lll_futex_timed_wait and lll_futex_wake. Change lll_futex_wait
@ -1857,12 +1863,12 @@
lll_private_futex_timed_wait and lll_private_futex_wake.
(lll_robust_mutex_unlock): Fix typo.
* sysdeps/unix/sysv/linux/sh/pthread_barrier_wait.S: Use private
field in futex command setup.
field in futex command setup.
* sysdeps/unix/sysv/linux/sh/pthread_cond_timedwait.S: Use
COND_NWAITERS_SHIFT instead of COND_CLOCK_BITS.
* sysdeps/unix/sysv/linux/sh/pthread_cond_wait.S: Likewise.
* sysdeps/unix/sysv/linux/sh/pthread_once.S: Use private futexes
if they are available. Remove clear_once_control.
if they are available. Remove clear_once_control.
* sysdeps/unix/sysv/linux/sh/pthread_rwlock_rdlock.S: Use private
futexes if they are available.
* sysdeps/unix/sysv/linux/sh/pthread_rwlock_timedrdlock.S: Likewise.
@ -1873,7 +1879,7 @@
Wake only when there are waiters.
* sysdeps/unix/sysv/linux/sh/sem_wait.S: Add private futex
support. Indicate that there are waiters. Remove unnecessary
extra cancellation test.
extra cancellation test.
* sysdeps/unix/sysv/linux/sh/sem_timedwait.S: Likewise. Removed
left-over duplication of __sem_wait_cleanup.
@ -2587,14 +2593,14 @@
* tst-cancel25.c: New file.
2006-09-05 Jakub Jelinek <jakub@redhat.com>
Ulrich Drepper <drepper@redhat.com>
Ulrich Drepper <drepper@redhat.com>
* sysdeps/pthread/gai_misc.h (GAI_MISC_NOTIFY): Don't decrement
counterp if it is already zero.
* sysdeps/pthread/aio_misc.h (AIO_MISC_NOTIFY): Likewise..
2006-03-04 Jakub Jelinek <jakub@redhat.com>
Roland McGrath <roland@redhat.com>
Roland McGrath <roland@redhat.com>
* sysdeps/unix/sysv/linux/i386/lowlevellock.h
(LLL_STUB_UNWIND_INFO_START, LLL_STUB_UNWIND_INFO_END,
@ -2608,7 +2614,7 @@
* sysdeps/unix/sysv/linux/i386/i486/lowlevelrobustlock.S: Likewise.
2006-03-03 Jakub Jelinek <jakub@redhat.com>
Roland McGrath <roland@redhat.com>
Roland McGrath <roland@redhat.com>
* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h
(LLL_STUB_UNWIND_INFO_START, LLL_STUB_UNWIND_INFO_END,
@ -3181,7 +3187,7 @@
* sysdeps/pthread/pthread.h: Adjust mutex initializers.
* sysdeps/unix/sysv/linux/i386/not-cancel.h: Define openat_not_cancel,
openat_not_cancel_3, openat64_not_cancel, and openat64_not_cancel_3.
openat_not_cancel_3, openat64_not_cancel, and openat64_not_cancel_3.
2006-02-08 Jakub Jelinek <jakub@redhat.com>
@ -3603,7 +3609,7 @@
* Makefile ($(test-modules)): Remove static pattern rule.
2005-10-14 Jakub Jelinek <jakub@redhat.com>
Ulrich Drepper <drepper@redhat.com>
Ulrich Drepper <drepper@redhat.com>
* sysdeps/unix/sysv/linux/x86_64/pthread_once.S: Fix stack
alignment in callback function.
@ -3621,7 +3627,7 @@
atomic_compare_and_exchange_bool_acq.
2005-10-01 Ulrich Drepper <drepper@redhat.com>
Jakub Jelinek <jakub@redhat.com>
Jakub Jelinek <jakub@redhat.com>
* descr.h: Define SETXID_BIT and SETXID_BITMASK. Adjust
CANCEL_RESTMASK.

13
nptl/pthread_create.c
View File

@ -377,6 +377,19 @@ start_thread (void *arg)
}
#endif
/* Mark the memory of the stack as usable to the kernel. We free
everything except for the space used for the TCB itself. */
size_t pagesize_m1 = __getpagesize () - 1;
#ifdef _STACK_GROWS_DOWN
char *sp = CURRENT_STACK_FRAME;
size_t freesize = (sp - (char *) pd->stackblock) & ~pagesize_m1;
#else
# error "to do"
#endif
assert (freesize < pd->stackblock_size);
if (freesize > PTHREAD_STACK_MIN)
madvise (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
/* If the thread is detached free the TCB. */
if (IS_DETACHED (pd))
/* Free the TCB. */