2016-12-09 07:18:27 +00:00
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# Makefile for support library, used only at build and test time
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2018-01-01 00:32:25 +00:00
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# Copyright (C) 2016-2018 Free Software Foundation, Inc.
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2016-12-09 07:18:27 +00:00
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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subdir := support
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include ../Makeconfig
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extra-libs := libsupport
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extra-libs-others = $(extra-libs)
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extra-libs-noinstall := $(extra-libs)
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libsupport-routines = \
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check \
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2016-12-31 13:06:16 +00:00
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check_addrinfo \
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check_dns_packet \
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check_hostent \
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check_netent \
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2016-12-09 07:18:27 +00:00
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delayed_exit \
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ignore_stderr \
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2017-11-13 16:55:12 +00:00
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next_to_fault \
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2016-12-09 07:18:27 +00:00
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oom_error \
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2016-12-31 13:06:16 +00:00
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resolv_test \
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2016-12-09 07:18:27 +00:00
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set_fortify_handler \
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2017-12-22 09:55:40 +00:00
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support-xfstat \
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2017-06-02 13:50:36 +00:00
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support-xstat \
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2016-12-31 17:51:07 +00:00
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support_become_root \
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2017-06-02 13:50:36 +00:00
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support_can_chroot \
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2017-06-02 09:59:28 +00:00
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support_capture_subprocess \
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2017-06-02 13:50:36 +00:00
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support_capture_subprocess_check \
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2017-07-05 13:38:42 +00:00
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support_chroot \
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2018-08-31 20:07:47 +00:00
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support_copy_file_range \
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2018-08-21 10:56:53 +00:00
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support_descriptor_supports_holes \
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2017-11-18 13:30:20 +00:00
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support_enter_mount_namespace \
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2016-12-31 17:51:07 +00:00
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support_enter_network_namespace \
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2016-12-31 13:06:16 +00:00
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support_format_address_family \
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support_format_addrinfo \
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support_format_dns_packet \
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support_format_herrno \
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support_format_hostent \
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support_format_netent \
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2017-06-02 13:50:36 +00:00
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support_isolate_in_subprocess \
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[BZ 1190] Make EOF sticky in stdio.
C99 specifies that the EOF condition on a file is "sticky": once EOF
has been encountered, all subsequent reads should continue to return
EOF until the file is closed or something clears the "end-of-file
indicator" (e.g. fseek, clearerr). This is arguably a change from
C89, where the wording was ambiguous; the BSDs always had sticky EOF,
but the System V lineage would attempt to read from the underlying fd
again. GNU libc has followed System V for as long as we've been
using libio, but nowadays C99 conformance and BSD compatibility are
more important than System V compatibility.
You might wonder if changing the _underflow impls is sufficient to
apply the C99 semantics to all of the many stdio functions that
perform input. It should be enough to cover all paths to _IO_SYSREAD,
and the only other functions that call _IO_SYSREAD are the _seekoff
impls, which is OK because seeking clears EOF, and the _xsgetn impls,
which, as far as I can tell, are unused within glibc.
The test programs in this patch use a pseudoterminal to set up the
necessary conditions. To facilitate this I added a new test-support
function that sets up a pair of pty file descriptors for you; it's
almost the same as BSD openpty, the only differences are that it
allocates the optionally-returned tty pathname with malloc, and that
it crashes if anything goes wrong.
[BZ #1190]
[BZ #19476]
* libio/fileops.c (_IO_new_file_underflow): Return EOF immediately
if the _IO_EOF_SEEN bit is already set; update commentary.
* libio/oldfileops.c (_IO_old_file_underflow): Likewise.
* libio/wfileops.c (_IO_wfile_underflow): Likewise.
* support/support_openpty.c, support/tty.h: New files.
* support/Makefile (libsupport-routines): Add support_openpty.
* libio/tst-fgetc-after-eof.c, wcsmbs/test-fgetwc-after-eof.c:
New test cases.
* libio/Makefile (tests): Add tst-fgetc-after-eof.
* wcsmbs/Makefile (tests): Add tst-fgetwc-after-eof.
2018-02-22 00:12:51 +00:00
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support_openpty \
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2018-07-06 05:10:41 +00:00
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support_paths \
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2018-05-16 15:00:35 +00:00
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support_quote_blob \
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2016-12-28 12:37:18 +00:00
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support_record_failure \
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2016-12-31 13:06:16 +00:00
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support_run_diff \
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2017-06-02 13:50:36 +00:00
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support_shared_allocate \
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2018-05-16 15:00:35 +00:00
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support_test_compare_blob \
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2017-12-04 19:54:24 +00:00
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support_test_compare_failure \
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2017-06-02 13:50:36 +00:00
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support_write_file_string \
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2016-12-09 07:18:27 +00:00
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support_test_main \
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2016-12-28 12:37:18 +00:00
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support_test_verify_impl \
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2016-12-09 07:18:27 +00:00
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temp_file \
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write_message \
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2016-12-31 13:06:16 +00:00
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xaccept \
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2017-04-19 05:44:48 +00:00
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xaccept4 \
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2016-12-09 07:18:27 +00:00
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xasprintf \
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xbind \
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xcalloc \
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2017-06-02 13:50:36 +00:00
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xchroot \
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2017-03-15 12:13:58 +00:00
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xclose \
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2016-12-31 13:06:16 +00:00
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xconnect \
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2018-08-31 20:07:47 +00:00
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xcopy_file_range \
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2017-09-21 02:37:45 +00:00
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xdlfcn \
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2017-06-02 09:59:28 +00:00
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xdup2 \
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2016-12-31 13:06:16 +00:00
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xfclose \
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xfopen \
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2016-12-28 12:37:18 +00:00
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xfork \
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2017-12-22 09:55:40 +00:00
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xftruncate \
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2016-12-31 13:06:16 +00:00
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xgetsockname \
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xlisten \
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2017-12-22 09:55:40 +00:00
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xlseek \
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2016-12-09 07:18:27 +00:00
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xmalloc \
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2016-12-31 13:06:16 +00:00
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xmemstream \
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2017-06-02 13:50:36 +00:00
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xmkdir \
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2018-07-06 05:10:41 +00:00
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xmkdirp \
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2017-01-27 05:53:19 +00:00
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xmmap \
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2017-06-21 11:09:08 +00:00
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xmprotect \
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2017-01-27 05:53:19 +00:00
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xmunmap \
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2017-06-02 13:50:36 +00:00
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xopen \
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2017-06-02 09:59:28 +00:00
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xpipe \
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2016-12-31 13:06:16 +00:00
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xpoll \
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2017-01-29 00:13:34 +00:00
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xpthread_attr_destroy \
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xpthread_attr_init \
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xpthread_attr_setdetachstate \
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nptl: Invert the mmap/mprotect logic on allocated stacks (BZ#18988)
Current allocate_stack logic for create stacks is to first mmap all
the required memory with the desirable memory and then mprotect the
guard area with PROT_NONE if required. Although it works as expected,
it pessimizes the allocation because it requires the kernel to actually
increase commit charge (it counts against the available physical/swap
memory available for the system).
The only issue is to actually check this change since side-effects are
really Linux specific and to actually account them it would require a
kernel specific tests to parse the system wide information. On the kernel
I checked /proc/self/statm does not show any meaningful difference for
vmm and/or rss before and after thread creation. I could only see
really meaningful information checking on system wide /proc/meminfo
between thread creation: MemFree, MemAvailable, and Committed_AS shows
large difference without the patch. I think trying to use these
kind of information on a testcase is fragile.
The BZ#18988 reports shows that the commit pages are easily seen with
mlockall (MCL_FUTURE) (with lock all pages that become mapped in the
process) however a more straighfoward testcase shows that pthread_create
could be faster using this patch:
--
static const int inner_count = 256;
static const int outer_count = 128;
static
void *thread1(void *arg)
{
return NULL;
}
static
void *sleeper(void *arg)
{
pthread_t ts[inner_count];
for (int i = 0; i < inner_count; i++)
pthread_create (&ts[i], &a, thread1, NULL);
for (int i = 0; i < inner_count; i++)
pthread_join (ts[i], NULL);
return NULL;
}
int main(void)
{
pthread_attr_init(&a);
pthread_attr_setguardsize(&a, 1<<20);
pthread_attr_setstacksize(&a, 1134592);
pthread_t ts[outer_count];
for (int i = 0; i < outer_count; i++)
pthread_create(&ts[i], &a, sleeper, NULL);
for (int i = 0; i < outer_count; i++)
pthread_join(ts[i], NULL);
assert(r == 0);
}
return 0;
}
--
On x86_64 (4.4.0-45-generic, gcc 5.4.0) running the small benchtests
I see:
$ time ./test
real 0m3.647s
user 0m0.080s
sys 0m11.836s
While with the patch I see:
$ time ./test
real 0m0.696s
user 0m0.040s
sys 0m1.152s
So I added a pthread_create benchtest (thread_create) which check
the thread creation latency. As for the simple benchtests, I saw
improvements in thread creation on all architectures I tested the
change.
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
arm-linux-gnueabihf, powerpc64le-linux-gnu, sparc64-linux-gnu,
and sparcv9-linux-gnu.
[BZ #18988]
* benchtests/thread_create-inputs: New file.
* benchtests/thread_create-source.c: Likewise.
* support/xpthread_attr_setguardsize.c: Likewise.
* support/Makefile (libsupport-routines): Add
xpthread_attr_setguardsize object.
* support/xthread.h: Add xpthread_attr_setguardsize prototype.
* benchtests/Makefile (bench-pthread): Add thread_create.
* nptl/allocatestack.c (allocate_stack): Call mmap with PROT_NONE and
then mprotect the required area.
2017-01-31 20:01:59 +00:00
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xpthread_attr_setguardsize \
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2017-12-05 14:20:30 +00:00
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xpthread_attr_setstacksize \
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2016-12-09 07:18:27 +00:00
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xpthread_barrier_destroy \
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xpthread_barrier_init \
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xpthread_barrier_wait \
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2018-05-29 08:48:46 +00:00
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xpthread_barrierattr_destroy \
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xpthread_barrierattr_init \
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xpthread_barrierattr_setpshared \
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2016-12-09 07:18:27 +00:00
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xpthread_cancel \
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xpthread_check_return \
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xpthread_cond_wait \
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xpthread_create \
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xpthread_detach \
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xpthread_join \
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2017-01-27 05:53:19 +00:00
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xpthread_mutex_consistent \
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xpthread_mutex_destroy \
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xpthread_mutex_init \
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2016-12-09 07:18:27 +00:00
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xpthread_mutex_lock \
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xpthread_mutex_unlock \
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2017-01-27 05:53:19 +00:00
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xpthread_mutexattr_destroy \
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xpthread_mutexattr_init \
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xpthread_mutexattr_setprotocol \
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xpthread_mutexattr_setpshared \
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xpthread_mutexattr_setrobust \
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xpthread_mutexattr_settype \
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2016-12-31 13:06:16 +00:00
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xpthread_once \
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2017-07-28 04:22:44 +00:00
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xpthread_rwlock_init \
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xpthread_rwlock_rdlock \
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xpthread_rwlock_unlock \
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2017-11-12 08:53:06 +00:00
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xpthread_rwlock_wrlock \
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2017-07-28 04:22:44 +00:00
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xpthread_rwlockattr_init \
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xpthread_rwlockattr_setkind_np \
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2016-12-09 07:18:27 +00:00
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xpthread_sigmask \
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xpthread_spin_lock \
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xpthread_spin_unlock \
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2017-12-05 14:20:30 +00:00
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xraise \
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2017-11-12 08:53:06 +00:00
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xreadlink \
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2016-12-09 07:18:27 +00:00
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xrealloc \
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2016-12-31 13:06:16 +00:00
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xrecvfrom \
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xsendto \
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xsetsockopt \
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2017-12-05 14:20:30 +00:00
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xsigaction \
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xsignal \
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2016-12-31 17:51:07 +00:00
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xsocket \
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2016-12-31 13:06:16 +00:00
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xstrdup \
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2017-11-12 08:53:06 +00:00
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xstrndup \
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2018-07-06 05:10:41 +00:00
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xsymlink \
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2017-12-05 14:20:30 +00:00
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xsysconf \
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2017-11-12 08:53:06 +00:00
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xunlink \
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2016-12-28 12:37:18 +00:00
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xwaitpid \
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2016-12-31 13:06:16 +00:00
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xwrite \
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2016-12-09 07:18:27 +00:00
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libsupport-static-only-routines := $(libsupport-routines)
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# Only build one variant of the library.
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libsupport-inhibit-o := .os
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ifeq ($(build-shared),yes)
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libsupport-inhibit-o += .o
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endif
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2018-07-06 05:10:41 +00:00
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CFLAGS-support_paths.c = \
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-DSRCDIR_PATH=\"`cd .. ; pwd`\" \
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-DOBJDIR_PATH=\"`cd $(objpfx)/..; pwd`\" \
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-DINSTDIR_PATH=\"$(prefix)\" \
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-DLIBDIR_PATH=\"$(libdir)\"
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ifeq (,$(CXX))
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LINKS_DSO_PROGRAM = links-dso-program-c
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else
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LINKS_DSO_PROGRAM = links-dso-program
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2018-08-25 02:07:23 +00:00
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LDLIBS-links-dso-program = -lstdc++ -lgcc -lgcc_s $(libunwind)
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2018-07-06 05:10:41 +00:00
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endif
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LDLIBS-test-container = $(libsupport)
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others += test-container
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others-noinstall += test-container
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others += shell-container echo-container true-container
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others-noinstall += shell-container echo-container true-container
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others += $(LINKS_DSO_PROGRAM)
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others-noinstall += $(LINKS_DSO_PROGRAM)
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$(objpfx)test-container : $(libsupport)
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$(objpfx)shell-container : $(libsupport)
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$(objpfx)echo-container : $(libsupport)
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$(objpfx)true-container : $(libsupport)
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2016-12-28 12:37:18 +00:00
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tests = \
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README-testing \
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2016-12-31 17:51:07 +00:00
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tst-support-namespace \
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2017-06-02 09:59:28 +00:00
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tst-support_capture_subprocess \
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2017-03-15 11:57:12 +00:00
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tst-support_format_dns_packet \
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2018-05-16 15:00:35 +00:00
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tst-support_quote_blob \
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2016-12-28 12:37:18 +00:00
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tst-support_record_failure \
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2017-12-04 19:54:24 +00:00
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tst-test_compare \
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2018-05-16 15:00:35 +00:00
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tst-test_compare_blob \
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2017-11-12 08:53:06 +00:00
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tst-xreadlink \
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2016-12-28 12:37:18 +00:00
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2016-12-30 13:01:44 +00:00
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ifeq ($(run-built-tests),yes)
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2016-12-28 12:37:18 +00:00
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tests-special = \
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$(objpfx)tst-support_record_failure-2.out
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$(objpfx)tst-support_record_failure-2.out: tst-support_record_failure-2.sh \
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$(objpfx)tst-support_record_failure
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$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
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'$(run-program-env)' '$(test-program-prefix-after-env)' \
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> $@; \
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$(evaluate-test)
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2016-12-30 13:01:44 +00:00
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endif
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2016-12-09 07:18:27 +00:00
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2017-03-15 11:57:12 +00:00
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$(objpfx)tst-support_format_dns_packet: $(common-objpfx)resolv/libresolv.so
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2016-12-09 07:18:27 +00:00
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include ../Rules
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