move Rust sources to top level, C sources into c_src

[bcachefs-tools-debian] / linux / shrinker.c

diff --git a/linux/shrinker.c b/linux/shrinker.c
deleted file mode 100644 (file)
index ca34ebc..0000000
--- a/linux/shrinker.c
+++ /dev/null
@@ -1,140 +0,0 @@
-
-#include <stdio.h>
-#include <unistd.h>
-
-#include <linux/kthread.h>
-#include <linux/list.h>
-#include <linux/mm.h>
-#include <linux/mutex.h>
-#include <linux/shrinker.h>
-
-#include "tools-util.h"
-
-static LIST_HEAD(shrinker_list);
-static DEFINE_MUTEX(shrinker_lock);
-
-void shrinker_free(struct shrinker *s)
-{
-       if (s->list.next) {
-               mutex_lock(&shrinker_lock);
-               list_del(&s->list);
-               mutex_unlock(&shrinker_lock);
-       }
-       free(s);
-}
-
-struct shrinker *shrinker_alloc(unsigned int flags, const char *fmt, ...)
-{
-       return calloc(sizeof(struct shrinker), 1);
-}
-
-int shrinker_register(struct shrinker *shrinker)
-{
-       mutex_lock(&shrinker_lock);
-       list_add_tail(&shrinker->list, &shrinker_list);
-       mutex_unlock(&shrinker_lock);
-       return 0;
-}
-
-static void run_shrinkers_allocation_failed(gfp_t gfp_mask)
-{
-       struct shrinker *shrinker;
-
-       mutex_lock(&shrinker_lock);
-       list_for_each_entry(shrinker, &shrinker_list, list) {
-               struct shrink_control sc = { .gfp_mask  = gfp_mask, };
-
-               unsigned long have = shrinker->count_objects(shrinker, &sc);
-
-               sc.nr_to_scan = have / 8;
-
-               shrinker->scan_objects(shrinker, &sc);
-       }
-       mutex_unlock(&shrinker_lock);
-}
-
-void run_shrinkers(gfp_t gfp_mask, bool allocation_failed)
-{
-       struct shrinker *shrinker;
-       struct sysinfo info;
-       s64 want_shrink;
-
-       if (!(gfp_mask & GFP_KERNEL))
-               return;
-
-       /* Fast out if there are no shrinkers to run. */
-       if (list_empty(&shrinker_list))
-               return;
-
-       if (allocation_failed) {
-               run_shrinkers_allocation_failed(gfp_mask);
-               return;
-       }
-
-       si_meminfo(&info);
-
-       /* Aim for 6% of physical RAM free without anything in swap */
-       want_shrink = (info.totalram >> 4) - info.freeram
-                       + info.totalswap - info.freeswap;
-       if (want_shrink <= 0)
-               return;
-
-       mutex_lock(&shrinker_lock);
-       list_for_each_entry(shrinker, &shrinker_list, list) {
-               struct shrink_control sc = {
-                       .gfp_mask       = gfp_mask,
-                       .nr_to_scan     = want_shrink >> PAGE_SHIFT
-               };
-
-               shrinker->scan_objects(shrinker, &sc);
-       }
-       mutex_unlock(&shrinker_lock);
-}
-
-static int shrinker_thread(void *arg)
-{
-       while (!kthread_should_stop()) {
-               struct timespec to;
-               int v;
-
-               clock_gettime(CLOCK_MONOTONIC, &to);
-               to.tv_sec += 1;
-               __set_current_state(TASK_INTERRUPTIBLE);
-               errno = 0;
-               while ((v = READ_ONCE(current->state)) != TASK_RUNNING &&
-                      errno != ETIMEDOUT)
-                       futex(&current->state, FUTEX_WAIT_BITSET|FUTEX_PRIVATE_FLAG,
-                             v, &to, NULL, (uint32_t)~0);
-               if (kthread_should_stop())
-                       break;
-               if (v != TASK_RUNNING)
-                       __set_current_state(TASK_RUNNING);
-               run_shrinkers(GFP_KERNEL, false);
-       }
-
-       return 0;
-}
-
-struct task_struct *shrinker_task;
-
-__attribute__((constructor(103)))
-static void shrinker_thread_init(void)
-{
-       shrinker_task = kthread_run(shrinker_thread, NULL, "shrinkers");
-       BUG_ON(IS_ERR(shrinker_task));
-}
-
-#if 0
-/*
- * We seem to be hitting a rare segfault when shutting down the shrinker thread.
- * Disabling this is going to cause some harmless warnings about memory leaks:
- */
-__attribute__((destructor(103)))
-static void shrinker_thread_exit(void)
-{
-       int ret = kthread_stop(shrinker_task);
-       BUG_ON(ret);
-
-       shrinker_task = NULL;
-}
-#endif