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glibc/nptl/nptl-stack.h

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nptl: Move stack cache management, __libpthread_freeres into libc This replaces the FREE_P macro with the __nptl_stack_in_use inline function. stack_list_del is renamed to __nptl_stack_list_del, stack_list_add to __nptl_stack_list_add, __deallocate_stack to __nptl_deallocate_stack, free_stacks to __nptl_free_stacks. It is convenient to move __libpthread_freeres into libc at the same time. This removes the temporary __default_pthread_attr_freeres export and restores full freeres coverage for __default_pthread_attr. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-11 09:08:00 +00:00
/* Stack cache management for NPTL.
Update copyright dates with scripts/update-copyrights
2023-01-06 21:08:04 +00:00
Copyright (C) 2002-2023 Free Software Foundation, Inc.
nptl: Move stack cache management, __libpthread_freeres into libc This replaces the FREE_P macro with the __nptl_stack_in_use inline function. stack_list_del is renamed to __nptl_stack_list_del, stack_list_add to __nptl_stack_list_add, __deallocate_stack to __nptl_deallocate_stack, free_stacks to __nptl_free_stacks. It is convenient to move __libpthread_freeres into libc at the same time. This removes the temporary __default_pthread_attr_freeres export and restores full freeres coverage for __default_pthread_attr. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-11 09:08:00 +00:00
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _NPTL_STACK_H
#define _NPTL_STACK_H
nptl: Eliminate the __static_tls_size, __static_tls_align_m1 variables Use the __nptl_tls_static_size_for_stack inline function instead, and the GLRO (dl_tls_static_align) value directly. The computation of GLRO (dl_tls_static_align) in _dl_determine_tlsoffset ensures that the alignment is at least TLS_TCB_ALIGN, which at least STACK_ALIGN (see allocate_stack). Therefore, the additional rounding-up step is removed. ALso move the initialization of the default stack size from __pthread_initialize_minimal_internal to __pthread_early_init. This introduces an extra system call during single-threaded startup, but this simplifies the initialization sequence. No locking is needed around the writes to __default_pthread_attr because the process is single-threaded at this point. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-21 20:35:00 +00:00
#include <nptl/descr.h>
#include <ldsodefs.h>
nptl: Move stack cache management, __libpthread_freeres into libc This replaces the FREE_P macro with the __nptl_stack_in_use inline function. stack_list_del is renamed to __nptl_stack_list_del, stack_list_add to __nptl_stack_list_add, __deallocate_stack to __nptl_deallocate_stack, free_stacks to __nptl_free_stacks. It is convenient to move __libpthread_freeres into libc at the same time. This removes the temporary __default_pthread_attr_freeres export and restores full freeres coverage for __default_pthread_attr. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-11 09:08:00 +00:00
#include <list.h>
#include <stdbool.h>
nptl: Add glibc.pthread.stack_cache_size tunable The valgrind/helgrind test suite needs a way to make stack dealloction more prompt, and this feature seems to be generally useful. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2021-06-28 13:48:58 +00:00
/* Maximum size of the cache, in bytes. 40 MiB by default. */
extern size_t __nptl_stack_cache_maxsize attribute_hidden;
Created tunable to force small pages on stack allocation. Created tunable glibc.pthread.stack_hugetlb to control when hugepages can be used for stack allocation. In case THP are enabled and glibc.pthread.stack_hugetlb is set to 0, glibc will madvise the kernel not to use allow hugepages for stack allocations. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2023-04-14 15:12:20 +00:00
/* Should allow stacks to use hugetlb. (1) is default. */
extern int32_t __nptl_stack_hugetlb;
nptl: Move stack cache management, __libpthread_freeres into libc This replaces the FREE_P macro with the __nptl_stack_in_use inline function. stack_list_del is renamed to __nptl_stack_list_del, stack_list_add to __nptl_stack_list_add, __deallocate_stack to __nptl_deallocate_stack, free_stacks to __nptl_free_stacks. It is convenient to move __libpthread_freeres into libc at the same time. This removes the temporary __default_pthread_attr_freeres export and restores full freeres coverage for __default_pthread_attr. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-11 09:08:00 +00:00
/* Check whether the stack is still used or not. */
static inline bool
__nptl_stack_in_use (struct pthread *pd)
{
return pd->tid <= 0;
}
/* Remove the stack ELEM from its list. */
void __nptl_stack_list_del (list_t *elem);
libc_hidden_proto (__nptl_stack_list_del)
/* Add ELEM to a stack list. LIST can be either &GL (dl_stack_used)
or &GL (dl_stack_cache). */
void __nptl_stack_list_add (list_t *elem, list_t *list);
libc_hidden_proto (__nptl_stack_list_add)
/* Free allocated stack. */
extern void __nptl_deallocate_stack (struct pthread *pd);
libc_hidden_proto (__nptl_deallocate_stack)
/* Free stacks until cache size is lower than LIMIT. */
void __nptl_free_stacks (size_t limit) attribute_hidden;
nptl: Eliminate the __static_tls_size, __static_tls_align_m1 variables Use the __nptl_tls_static_size_for_stack inline function instead, and the GLRO (dl_tls_static_align) value directly. The computation of GLRO (dl_tls_static_align) in _dl_determine_tlsoffset ensures that the alignment is at least TLS_TCB_ALIGN, which at least STACK_ALIGN (see allocate_stack). Therefore, the additional rounding-up step is removed. ALso move the initialization of the default stack size from __pthread_initialize_minimal_internal to __pthread_early_init. This introduces an extra system call during single-threaded startup, but this simplifies the initialization sequence. No locking is needed around the writes to __default_pthread_attr because the process is single-threaded at this point. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-21 20:35:00 +00:00
/* Compute the size of the static TLS area based on data from the
dynamic loader. */
static inline size_t
__nptl_tls_static_size_for_stack (void)
{
return roundup (GLRO (dl_tls_static_size), GLRO (dl_tls_static_align));
}
nptl: Move stack cache management, __libpthread_freeres into libc This replaces the FREE_P macro with the __nptl_stack_in_use inline function. stack_list_del is renamed to __nptl_stack_list_del, stack_list_add to __nptl_stack_list_add, __deallocate_stack to __nptl_deallocate_stack, free_stacks to __nptl_free_stacks. It is convenient to move __libpthread_freeres into libc at the same time. This removes the temporary __default_pthread_attr_freeres export and restores full freeres coverage for __default_pthread_attr. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-05-11 09:08:00 +00:00
#endif /* _NPTL_STACK_H */
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