mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Here's the big, really big, staging tree patches for 4.2-rc1. Loads of stuff in here, almost all just coding style fixes / churn, and a few new drivers as well, one of which I just disabled from the build a few minutes ago due to way too many build warnings. Other than the one "disable this driver" patch, all of these have been in linux-next for quite a while with no reported issues. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEABECAAYFAlWNpc0ACgkQMUfUDdst+ym8EgCg0pL1Qcf9Se3jAc96fLt+itpv Rd0AoI9uJcq8Qm7d+IXnz3ojLnN9xvN3 =xt0u -----END PGP SIGNATURE----- Merge tag 'staging-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging Pull staging driver updates from Greg KH: "Here's the big, really big, staging tree patches for 4.2-rc1. Loads of stuff in here, almost all just coding style fixes / churn, and a few new drivers as well, one of which I just disabled from the build a few minutes ago due to way too many build warnings. Other than the one "disable this driver" patch, all of these have been in linux-next for quite a while with no reported issues" * tag 'staging-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (1163 commits) staging: wilc1000: disable driver due to build warnings Staging: rts5208: fix CHANGE_LINK_STATE value Staging: sm750fb: ddk750_swi2c.c: Insert spaces before parenthesis Staging: sm750fb: ddk750_swi2c.c: Place braces on correct lines Staging: sm750fb: ddk750_swi2c.c: Insert spaces around operators Staging: sm750fb: ddk750_swi2c.c: Replace spaces with tabs Staging: sm750fb: ddk750_swi2c.h: Shorten lines to under 80 characters Staging: sm750fb: ddk750_swi2c.h: Replace spaces with tabs Staging: sm750fb: modedb.h: Shorten lines to under 80 characters Staging: sm750fb: modedb.h: Replace spaces with tabs staging: comedi: addi_apci_3120: rename 'this_board' variables staging: comedi: addi_apci_1516: rename 'this_board' variables staging: comedi: ni_atmio: cleanup ni_getboardtype() staging: comedi: vmk80xx: sanity check context used to get the boardinfo staging: comedi: vmk80xx: rename 'boardinfo' variables staging: comedi: dt3000: rename 'this_board' variables staging: comedi: adv_pci_dio: rename 'this_board' variables staging: comedi: cb_pcidas64: rename 'thisboard' variables staging: comedi: cb_pcidas: rename 'thisboard' variables staging: comedi: me4000: rename 'thisboard' variables ...
214 lines
6.1 KiB
C
214 lines
6.1 KiB
C
/* drivers/misc/lowmemorykiller.c
|
|
*
|
|
* The lowmemorykiller driver lets user-space specify a set of memory thresholds
|
|
* where processes with a range of oom_score_adj values will get killed. Specify
|
|
* the minimum oom_score_adj values in
|
|
* /sys/module/lowmemorykiller/parameters/adj and the number of free pages in
|
|
* /sys/module/lowmemorykiller/parameters/minfree. Both files take a comma
|
|
* separated list of numbers in ascending order.
|
|
*
|
|
* For example, write "0,8" to /sys/module/lowmemorykiller/parameters/adj and
|
|
* "1024,4096" to /sys/module/lowmemorykiller/parameters/minfree to kill
|
|
* processes with a oom_score_adj value of 8 or higher when the free memory
|
|
* drops below 4096 pages and kill processes with a oom_score_adj value of 0 or
|
|
* higher when the free memory drops below 1024 pages.
|
|
*
|
|
* The driver considers memory used for caches to be free, but if a large
|
|
* percentage of the cached memory is locked this can be very inaccurate
|
|
* and processes may not get killed until the normal oom killer is triggered.
|
|
*
|
|
* Copyright (C) 2007-2008 Google, Inc.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/oom.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/profile.h>
|
|
#include <linux/notifier.h>
|
|
|
|
static uint32_t lowmem_debug_level = 1;
|
|
static short lowmem_adj[6] = {
|
|
0,
|
|
1,
|
|
6,
|
|
12,
|
|
};
|
|
static int lowmem_adj_size = 4;
|
|
static int lowmem_minfree[6] = {
|
|
3 * 512, /* 6MB */
|
|
2 * 1024, /* 8MB */
|
|
4 * 1024, /* 16MB */
|
|
16 * 1024, /* 64MB */
|
|
};
|
|
static int lowmem_minfree_size = 4;
|
|
|
|
static unsigned long lowmem_deathpending_timeout;
|
|
|
|
#define lowmem_print(level, x...) \
|
|
do { \
|
|
if (lowmem_debug_level >= (level)) \
|
|
pr_info(x); \
|
|
} while (0)
|
|
|
|
static unsigned long lowmem_count(struct shrinker *s,
|
|
struct shrink_control *sc)
|
|
{
|
|
return global_page_state(NR_ACTIVE_ANON) +
|
|
global_page_state(NR_ACTIVE_FILE) +
|
|
global_page_state(NR_INACTIVE_ANON) +
|
|
global_page_state(NR_INACTIVE_FILE);
|
|
}
|
|
|
|
static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc)
|
|
{
|
|
struct task_struct *tsk;
|
|
struct task_struct *selected = NULL;
|
|
unsigned long rem = 0;
|
|
int tasksize;
|
|
int i;
|
|
short min_score_adj = OOM_SCORE_ADJ_MAX + 1;
|
|
int selected_tasksize = 0;
|
|
short selected_oom_score_adj;
|
|
int array_size = ARRAY_SIZE(lowmem_adj);
|
|
int other_free = global_page_state(NR_FREE_PAGES) - totalreserve_pages;
|
|
int other_file = global_page_state(NR_FILE_PAGES) -
|
|
global_page_state(NR_SHMEM) -
|
|
total_swapcache_pages();
|
|
|
|
if (lowmem_adj_size < array_size)
|
|
array_size = lowmem_adj_size;
|
|
if (lowmem_minfree_size < array_size)
|
|
array_size = lowmem_minfree_size;
|
|
for (i = 0; i < array_size; i++) {
|
|
if (other_free < lowmem_minfree[i] &&
|
|
other_file < lowmem_minfree[i]) {
|
|
min_score_adj = lowmem_adj[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
lowmem_print(3, "lowmem_scan %lu, %x, ofree %d %d, ma %hd\n",
|
|
sc->nr_to_scan, sc->gfp_mask, other_free,
|
|
other_file, min_score_adj);
|
|
|
|
if (min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
|
|
lowmem_print(5, "lowmem_scan %lu, %x, return 0\n",
|
|
sc->nr_to_scan, sc->gfp_mask);
|
|
return 0;
|
|
}
|
|
|
|
selected_oom_score_adj = min_score_adj;
|
|
|
|
rcu_read_lock();
|
|
for_each_process(tsk) {
|
|
struct task_struct *p;
|
|
short oom_score_adj;
|
|
|
|
if (tsk->flags & PF_KTHREAD)
|
|
continue;
|
|
|
|
p = find_lock_task_mm(tsk);
|
|
if (!p)
|
|
continue;
|
|
|
|
if (test_tsk_thread_flag(p, TIF_MEMDIE) &&
|
|
time_before_eq(jiffies, lowmem_deathpending_timeout)) {
|
|
task_unlock(p);
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
oom_score_adj = p->signal->oom_score_adj;
|
|
if (oom_score_adj < min_score_adj) {
|
|
task_unlock(p);
|
|
continue;
|
|
}
|
|
tasksize = get_mm_rss(p->mm);
|
|
task_unlock(p);
|
|
if (tasksize <= 0)
|
|
continue;
|
|
if (selected) {
|
|
if (oom_score_adj < selected_oom_score_adj)
|
|
continue;
|
|
if (oom_score_adj == selected_oom_score_adj &&
|
|
tasksize <= selected_tasksize)
|
|
continue;
|
|
}
|
|
selected = p;
|
|
selected_tasksize = tasksize;
|
|
selected_oom_score_adj = oom_score_adj;
|
|
lowmem_print(2, "select %d (%s), adj %hd, size %d, to kill\n",
|
|
p->pid, p->comm, oom_score_adj, tasksize);
|
|
}
|
|
if (selected) {
|
|
task_lock(selected);
|
|
if (!selected->mm) {
|
|
/* Already exited, cannot do mark_tsk_oom_victim() */
|
|
task_unlock(selected);
|
|
goto out;
|
|
}
|
|
/*
|
|
* FIXME: lowmemorykiller shouldn't abuse global OOM killer
|
|
* infrastructure. There is no real reason why the selected
|
|
* task should have access to the memory reserves.
|
|
*/
|
|
mark_oom_victim(selected);
|
|
task_unlock(selected);
|
|
lowmem_print(1, "send sigkill to %d (%s), adj %hd, size %d\n",
|
|
selected->pid, selected->comm,
|
|
selected_oom_score_adj, selected_tasksize);
|
|
lowmem_deathpending_timeout = jiffies + HZ;
|
|
send_sig(SIGKILL, selected, 0);
|
|
rem += selected_tasksize;
|
|
}
|
|
out:
|
|
lowmem_print(4, "lowmem_scan %lu, %x, return %lu\n",
|
|
sc->nr_to_scan, sc->gfp_mask, rem);
|
|
rcu_read_unlock();
|
|
return rem;
|
|
}
|
|
|
|
static struct shrinker lowmem_shrinker = {
|
|
.scan_objects = lowmem_scan,
|
|
.count_objects = lowmem_count,
|
|
.seeks = DEFAULT_SEEKS * 16
|
|
};
|
|
|
|
static int __init lowmem_init(void)
|
|
{
|
|
register_shrinker(&lowmem_shrinker);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit lowmem_exit(void)
|
|
{
|
|
unregister_shrinker(&lowmem_shrinker);
|
|
}
|
|
|
|
module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR);
|
|
module_param_array_named(adj, lowmem_adj, short, &lowmem_adj_size,
|
|
S_IRUGO | S_IWUSR);
|
|
module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size,
|
|
S_IRUGO | S_IWUSR);
|
|
module_param_named(debug_level, lowmem_debug_level, uint, S_IRUGO | S_IWUSR);
|
|
|
|
module_init(lowmem_init);
|
|
module_exit(lowmem_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|