X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fdefaults.c;h=ee48c436879a7d356f6e649b5cd3b89a419533bc;hp=d131971ecf05e62b89d1cb1bd3db064c980b1d6c;hb=3b13cbcca15abc7ddb64731ba047cfdad75d97a0;hpb=78d8fb4ff7f6bfd6bf84994bd94a0edec6de0825

diff --git a/src/common/defaults.c b/src/common/defaults.c
index d131971ec..ee48c4368 100644
--- a/src/common/defaults.c
+++ b/src/common/defaults.c
@@ -1,33 +1,24 @@
 /*
- * Copyright (C) 2012 - Simon Marchi <simon.marchi@polymtl.ca>
+ * Copyright (C) 2012 Simon Marchi <simon.marchi@polymtl.ca>
  *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License, version 2 only, as
- * published by the Free Software Foundation.
+ * SPDX-License-Identifier: GPL-2.0-only
  *
- * This program 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 General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 51
- * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #define _LGPL_SOURCE
 #include <stddef.h>
 #include <unistd.h>
+#include <stdbool.h>
+#include <sys/resource.h>
+#include <pthread.h>
 
 #include "defaults.h"
 #include "macros.h"
 #include "align.h"
+#include "error.h"
 
-static size_t default_channel_subbuf_size;
-static size_t default_metadata_subbuf_size;
-static size_t default_kernel_channel_subbuf_size;
-static size_t default_ust_pid_channel_subbuf_size;
-static size_t default_ust_uid_channel_subbuf_size;
+static int pthread_attr_init_done;
+static pthread_attr_t tattr;
 
 LTTNG_HIDDEN
 size_t default_get_channel_subbuf_size(void)
@@ -58,3 +49,97 @@ size_t default_get_ust_uid_channel_subbuf_size(void)
 {
 	return max(DEFAULT_UST_UID_CHANNEL_SUBBUF_SIZE, PAGE_SIZE);
 }
+
+LTTNG_HIDDEN
+pthread_attr_t *default_pthread_attr(void)
+{
+	if (pthread_attr_init_done) {
+		return &tattr;
+	}
+
+	WARN("Uninitialized pthread attributes, using libc defaults.");
+	return NULL;
+}
+
+static void __attribute__((constructor)) init_default_pthread_attr(void)
+{
+	int ret;
+	struct rlimit rlim;
+	size_t pthread_ss, system_ss, selected_ss;
+
+	ret = pthread_attr_init(&tattr);
+	if (ret) {
+		errno = ret;
+		PERROR("pthread_attr_init");
+		goto error;
+	}
+
+	/* Get system stack size limits. */
+	ret = getrlimit(RLIMIT_STACK, &rlim);
+	if (ret < 0) {
+		PERROR("getrlimit");
+		goto error_destroy;
+	}
+	DBG("Stack size limits: soft %lld, hard %lld bytes",
+			(long long) rlim.rlim_cur,
+			(long long) rlim.rlim_max);
+
+	/*
+	 * getrlimit() may return a stack size of "-1", meaning "unlimited".
+	 * In this case, we impose a known-good default minimum value which will
+	 * override the libc's default stack size if it is smaller.
+	 */
+	system_ss = rlim.rlim_cur != -1 ? rlim.rlim_cur :
+			DEFAULT_LTTNG_THREAD_STACK_SIZE;
+
+	/* Get pthread default thread stack size. */
+	ret = pthread_attr_getstacksize(&tattr, &pthread_ss);
+	if (ret < 0) {
+		PERROR("pthread_attr_getstacksize");
+		goto error_destroy;
+	}
+	DBG("Default pthread stack size is %zu bytes", pthread_ss);
+
+	selected_ss = max_t(size_t, pthread_ss, system_ss);
+	if (selected_ss < DEFAULT_LTTNG_THREAD_STACK_SIZE) {
+		DBG("Default stack size is too small, setting it to %zu bytes",
+			(size_t) DEFAULT_LTTNG_THREAD_STACK_SIZE);
+		selected_ss = DEFAULT_LTTNG_THREAD_STACK_SIZE;
+	}
+
+	if (rlim.rlim_max > 0 && selected_ss > rlim.rlim_max) {
+		WARN("Your system's stack size restrictions (%zu bytes) may be too low for the LTTng daemons to function properly, please set the stack size limit to at least %zu bytes to ensure reliable operation",
+			(size_t) rlim.rlim_max, (size_t) DEFAULT_LTTNG_THREAD_STACK_SIZE);
+		selected_ss = (size_t) rlim.rlim_max;
+	}
+
+	ret = pthread_attr_setstacksize(&tattr, selected_ss);
+	if (ret < 0) {
+		PERROR("pthread_attr_setstacksize");
+		goto error_destroy;
+	}
+	pthread_attr_init_done = 1;
+error:
+	return;
+error_destroy:
+	ret = pthread_attr_destroy(&tattr);
+	if (ret) {
+		errno = ret;
+		PERROR("pthread_attr_destroy");
+	}
+}
+
+static void __attribute__((destructor)) fini_default_pthread_attr(void)
+{
+	int ret;
+
+	if (!pthread_attr_init_done) {
+		return;
+	}
+
+	ret = pthread_attr_destroy(&tattr);
+	if (ret) {
+		errno = ret;
+		PERROR("pthread_attr_destroy");
+	}
+}