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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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6
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.

13
nptl/pthread_create.c
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@ -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. */