23774132158

Committed 30 Mar 2026 09:35PM UTC coverage: 72.398% (+0.2%) from 72.208%

Build # 23774132158

Build Type

push

github

Committed by

daandemeyer

Commit Message

Only enable `NoAuto=true` for supported partitions

When `Format=empty` is set we need to check for `NoAuto` support for
the partition type, else we print a warning later in the build.

Followup for 381304a

Coverage Stats

1 of 1 new or added line in 1 file covered. (100.0%)

7091 existing lines in 92 files now uncovered.

318474 of 439892 relevant lines covered (72.4%)

1151474.34 hits per line

Source File
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78.38

/src/basic/limits-util.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <unistd.h>

#include "alloc-util.h"
#include "cgroup-util.h"
#include "limits-util.h"
#include "log.h"
#include "memory-util.h"
#include "parse-util.h"
#include "process-util.h"
#include "procfs-util.h"

uint64_t physical_memory(void) {
        _cleanup_free_ char *root = NULL, *value = NULL;
        uint64_t mem, lim;
        size_t ps;
        long sc;
        int r;

        /* We return this as uint64_t in case we are running as 32-bit process on a 64-bit kernel with huge amounts of
         * memory.
         *
         * In order to support containers nicely that have a configured memory limit we'll take the minimum of the
         * physically reported amount of memory and the limit configured for the root cgroup, if there is any. */

        sc = sysconf(_SC_PHYS_PAGES);
        assert(sc > 0);

        ps = page_size();
        /* Silence static analyzers */
        assert((uint64_t) sc <= UINT64_MAX / (uint64_t) ps);
        mem = (uint64_t) sc * (uint64_t) ps;

        r = cg_get_root_path(&root);
        if (r < 0) {
                log_debug_errno(r, "Failed to determine root cgroup, ignoring cgroup memory limit: %m");
                return mem;
        }

        r = cg_get_attribute(root, "memory.max", &value);
        if (r == -ENOENT) /* Field does not exist on the system's top-level cgroup, hence don't
                           * complain. (Note that it might exist on our own root though, if we live
                           * in a cgroup namespace, hence check anyway instead of not even
                           * trying.) */
                return mem;
        if (r < 0) {
                log_debug_errno(r, "Failed to read memory.max cgroup attribute, ignoring cgroup memory limit: %m");
                return mem;
        }

        if (streq(value, "max"))
                return mem;

        r = safe_atou64(value, &lim);
        if (r < 0) {
                log_debug_errno(r, "Failed to parse cgroup memory limit '%s', ignoring: %m", value);
                return mem;
        }
        if (lim == UINT64_MAX)
                return mem;

        /* Make sure the limit is a multiple of our own page size */
        lim /= ps;
        lim *= ps;

        return MIN(mem, lim);
}

uint64_t physical_memory_scale(uint64_t v, uint64_t max) {
        uint64_t p, m, ps;

        /* Shortcut two special cases */
        if (v == 0)
                return 0;
        if (v == max)
                return physical_memory();

        assert(max > 0);

        /* Returns the physical memory size, multiplied by v divided by max. Returns UINT64_MAX on overflow. On success
         * the result is a multiple of the page size (rounds down). */

        ps = page_size();
        assert(ps > 0);

        p = physical_memory() / ps;
        assert(p > 0);

        if (v > UINT64_MAX / p)
                return UINT64_MAX;

        m = p * v;
        m /= max;

        if (m > UINT64_MAX / ps)
                return UINT64_MAX;

        return m * ps;
}

uint64_t system_tasks_max(void) {
        uint64_t a = TASKS_MAX, b = TASKS_MAX, c = TASKS_MAX;
        _cleanup_free_ char *root = NULL;
        int r;

        /* Determine the maximum number of tasks that may run on this system. We check three sources to
         * determine this limit:
         *
         * a) kernel.threads-max sysctl: the maximum number of tasks (threads) the kernel allows.
         *
         *    This puts a direct limit on the number of concurrent tasks.
         *
         * b) kernel.pid_max sysctl: the maximum PID value.
         *
         *    This limits the numeric range PIDs can take, and thus indirectly also limits the number of
         *    concurrent threads. It's primarily a compatibility concept: some crappy old code used a signed
         *    16-bit type for PIDs, hence the kernel provides a way to ensure the PIDs never go beyond
         *    INT16_MAX by default.
         *
         *    Also note the weird definition: PIDs assigned will be kept below this value, which means
         *    the number of tasks that can be created is one lower, as PID 0 is not a valid process ID.
         *
         * c) pids.max on the root cgroup: the kernel's configured maximum number of tasks.
         *
         * and then pick the smallest of the three.
         *
         * By default pid_max is set to much lower values than threads-max, hence the limit people come into
         * contact with first, as it's the lowest boundary they need to bump when they want higher number of
         * processes.
         */

        r = procfs_get_threads_max(&a);
        if (r < 0)
                log_debug_errno(r, "Failed to read kernel.threads-max, ignoring: %m");

        r = procfs_get_pid_max(&b);
        if (r < 0)
                log_debug_errno(r, "Failed to read kernel.pid_max, ignoring: %m");
        else if (b > 0)
                /* Subtract one from pid_max, since PID 0 is not a valid PID */
                b--;

        r = cg_get_root_path(&root);
        if (r < 0)
                log_debug_errno(r, "Failed to determine cgroup root path, ignoring: %m");
        else {
                /* We'll have the "pids.max" attribute on the our root cgroup only if we are in a
                 * CLONE_NEWCGROUP namespace. On the top-level namespace this attribute is missing, hence
                 * suppress any message about that */
                r = cg_get_attribute_as_uint64(root, "pids.max", &c);
                if (r < 0 && r != -ENODATA)
                        log_debug_errno(r, "Failed to read pids.max attribute of root cgroup, ignoring: %m");
        }

        return MIN3(a, b, c);
}

uint64_t system_tasks_max_scale(uint64_t v, uint64_t max) {
        uint64_t t, m;

        /* Shortcut two special cases */
        if (v == 0)
                return 0;
        if (v == max)
                return system_tasks_max();

        assert(max > 0);

        /* Multiply the system's task value by the fraction v/max. Hence, if max==100 this calculates percentages
         * relative to the system's maximum number of tasks. Returns UINT64_MAX on overflow. */

        t = system_tasks_max();
        assert(t > 0);

        if (v > UINT64_MAX / t) /* overflow? */
                return UINT64_MAX;

        m = t * v;
        return m / max;
}

1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3	#include <unistd.h>
4
5	#include "alloc-util.h"
6	#include "cgroup-util.h"
7	#include "limits-util.h"
8	#include "log.h"
9	#include "memory-util.h"
10	#include "parse-util.h"
11	#include "process-util.h"
12	#include "procfs-util.h"
13
14	uint64_t physical_memory(void) {	9,430✔
15	_cleanup_free_ char root = NULL, value = NULL;	9,430✔
16	uint64_t mem, lim;	9,430✔
17	size_t ps;	9,430✔
18	long sc;	9,430✔
19	int r;	9,430✔
20
21	/* We return this as uint64_t in case we are running as 32-bit process on a 64-bit kernel with huge amounts of
22	* memory.
23	*
24	* In order to support containers nicely that have a configured memory limit we'll take the minimum of the
25	* physically reported amount of memory and the limit configured for the root cgroup, if there is any. */
26
27	sc = sysconf(_SC_PHYS_PAGES);	9,430✔
28	assert(sc > 0);	9,430✔
29
30	ps = page_size();	9,430✔
31	/* Silence static analyzers */
32	assert((uint64_t) sc <= UINT64_MAX / (uint64_t) ps);	9,430✔
33	mem = (uint64_t) sc * (uint64_t) ps;	9,430✔
34
35	r = cg_get_root_path(&root);	9,430✔
36	if (r < 0) {	9,430✔
UNCOV 37	log_debug_errno(r, "Failed to determine root cgroup, ignoring cgroup memory limit: %m");	×
UNCOV 38	return mem;	×
39	}
40
41	r = cg_get_attribute(root, "memory.max", &value);	9,430✔
42	if (r == -ENOENT) /* Field does not exist on the system's top-level cgroup, hence don't	9,430✔
43	* complain. (Note that it might exist on our own root though, if we live
44	* in a cgroup namespace, hence check anyway instead of not even
45	* trying.) */
46	return mem;
47	if (r < 0) {	8,552✔
UNCOV 48	log_debug_errno(r, "Failed to read memory.max cgroup attribute, ignoring cgroup memory limit: %m");	×
UNCOV 49	return mem;	×
50	}
51
52	if (streq(value, "max"))	8,552✔
53	return mem;
54
55	r = safe_atou64(value, &lim);	×
56	if (r < 0) {	×
UNCOV 57	log_debug_errno(r, "Failed to parse cgroup memory limit '%s', ignoring: %m", value);	×
58	return mem;	×
59	}
UNCOV 60	if (lim == UINT64_MAX)	×
61	return mem;
62
63	/* Make sure the limit is a multiple of our own page size */
UNCOV 64	lim /= ps;	×
65	lim *= ps;	×
66
UNCOV 67	return MIN(mem, lim);	×
68	}
69
70	uint64_t physical_memory_scale(uint64_t v, uint64_t max) {	369✔
71	uint64_t p, m, ps;	369✔
72
73	/* Shortcut two special cases */
74	if (v == 0)	369✔
75	return 0;
76	if (v == max)	365✔
77	return physical_memory();	4✔
78
79	assert(max > 0);	361✔
80
81	/* Returns the physical memory size, multiplied by v divided by max. Returns UINT64_MAX on overflow. On success
82	* the result is a multiple of the page size (rounds down). */
83
84	ps = page_size();	361✔
85	assert(ps > 0);	361✔
86
87	p = physical_memory() / ps;	361✔
88	assert(p > 0);	361✔
89
90	if (v > UINT64_MAX / p)	361✔
91	return UINT64_MAX;
92
93	m = p * v;	360✔
94	m /= max;	360✔
95
96	if (m > UINT64_MAX / ps)	360✔
97	return UINT64_MAX;
98
99	return m * ps;	360✔
100	}
101
102	uint64_t system_tasks_max(void) {	13,246✔
103	uint64_t a = TASKS_MAX, b = TASKS_MAX, c = TASKS_MAX;	13,246✔
104	_cleanup_free_ char *root = NULL;	13,246✔
105	int r;	13,246✔
106
107	/* Determine the maximum number of tasks that may run on this system. We check three sources to
108	* determine this limit:
109	*
110	* a) kernel.threads-max sysctl: the maximum number of tasks (threads) the kernel allows.
111	*
112	* This puts a direct limit on the number of concurrent tasks.
113	*
114	* b) kernel.pid_max sysctl: the maximum PID value.
115	*
116	* This limits the numeric range PIDs can take, and thus indirectly also limits the number of
117	* concurrent threads. It's primarily a compatibility concept: some crappy old code used a signed
118	* 16-bit type for PIDs, hence the kernel provides a way to ensure the PIDs never go beyond
119	* INT16_MAX by default.
120	*
121	* Also note the weird definition: PIDs assigned will be kept below this value, which means
122	* the number of tasks that can be created is one lower, as PID 0 is not a valid process ID.
123	*
124	* c) pids.max on the root cgroup: the kernel's configured maximum number of tasks.
125	*
126	* and then pick the smallest of the three.
127	*
128	* By default pid_max is set to much lower values than threads-max, hence the limit people come into
129	* contact with first, as it's the lowest boundary they need to bump when they want higher number of
130	* processes.
131	*/
132
133	r = procfs_get_threads_max(&a);	13,246✔
134	if (r < 0)	13,246✔
UNCOV 135	log_debug_errno(r, "Failed to read kernel.threads-max, ignoring: %m");	×
136
137	r = procfs_get_pid_max(&b);	13,246✔
138	if (r < 0)	13,246✔
UNCOV 139	log_debug_errno(r, "Failed to read kernel.pid_max, ignoring: %m");	×
140	else if (b > 0)	13,246✔
141	/* Subtract one from pid_max, since PID 0 is not a valid PID */
142	b--;	13,246✔
143
144	r = cg_get_root_path(&root);	13,246✔
145	if (r < 0)	13,246✔
UNCOV 146	log_debug_errno(r, "Failed to determine cgroup root path, ignoring: %m");	×
147	else {
148	/* We'll have the "pids.max" attribute on the our root cgroup only if we are in a
149	* CLONE_NEWCGROUP namespace. On the top-level namespace this attribute is missing, hence
150	* suppress any message about that */
151	r = cg_get_attribute_as_uint64(root, "pids.max", &c);	13,246✔
152	if (r < 0 && r != -ENODATA)	13,246✔
UNCOV 153	log_debug_errno(r, "Failed to read pids.max attribute of root cgroup, ignoring: %m");	×
154	}
155
156	return MIN3(a, b, c);	13,246✔
157	}
158
159	uint64_t system_tasks_max_scale(uint64_t v, uint64_t max) {	10,256✔
160	uint64_t t, m;	10,256✔
161
162	/* Shortcut two special cases */
163	if (v == 0)	10,256✔
164	return 0;
165	if (v == max)	10,252✔
166	return system_tasks_max();	4✔
167
168	assert(max > 0);	10,248✔
169
170	/* Multiply the system's task value by the fraction v/max. Hence, if max==100 this calculates percentages
171	* relative to the system's maximum number of tasks. Returns UINT64_MAX on overflow. */
172
173	t = system_tasks_max();	10,248✔
174	assert(t > 0);	10,248✔
175
176	if (v > UINT64_MAX / t) /* overflow? */	10,248✔
177	return UINT64_MAX;
178
179	m = t * v;	10,247✔
180	return m / max;	10,247✔
181	}

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