void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
{
struct mm_struct *mm;
stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
mm = get_task_mm(p);
if (mm) {
stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
mmput(mm);
}
stats->read_char = p->ioac.rchar & KB_MASK;
stats->write_char = p->ioac.wchar & KB_MASK;
stats->read_syscalls = p->ioac.syscr & KB_MASK;
stats->write_syscalls = p->ioac.syscw & KB_MASK;
#ifdef CONFIG_TASK_IO_ACCOUNTING
stats->read_bytes = p->ioac.read_bytes & KB_MASK;
stats->write_bytes = p->ioac.write_bytes & KB_MASK;
stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
#else
stats->read_bytes = 0;
stats->write_bytes = 0;
stats->cancelled_write_bytes = 0;
#endif
}
/*
* fill in extended accounting fields
*/
void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
{
struct mm_struct *mm;
/* convert pages-usec to Mbyte-usec */
stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
mm = get_task_mm(p);
if (mm) {
/* adjust to KB unit */
stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB;
mmput(mm);
}
stats->read_char = p->ioac.rchar;
stats->write_char = p->ioac.wchar;
stats->read_syscalls = p->ioac.syscr;
stats->write_syscalls = p->ioac.syscw;
#ifdef CONFIG_TASK_IO_ACCOUNTING
stats->read_bytes = p->ioac.read_bytes;
stats->write_bytes = p->ioac.write_bytes;
stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
#else
stats->read_bytes = 0;
stats->write_bytes = 0;
stats->cancelled_write_bytes = 0;
#endif
}
static void lowmem_vm_shrinker(int largest, int rss_threshold)
{
struct task_struct *p;
struct task_struct *selected = NULL;
int vmsize, rssize;
int min_adj, min_large_adj;
int selected_vmsize = 0;
int selected_oom_adj;
int array_size = ARRAY_SIZE(lowmem_adj);
unsigned long flags;
/*
* If we already have a death outstanding, then
* bail out right away; indicating to vmscan
* that we have nothing further to offer on
* this pass.
*
*/
if (lowmem_deathpending)
return;
if (lowmem_adj_size < array_size)
array_size = lowmem_adj_size;
if (lowmem_minfree_size < array_size)
array_size = lowmem_minfree_size;
min_adj = lowmem_adj[array_size - 2]; /* lock onto cached processes only */
min_large_adj = lowmem_adj[array_size - 3]; /* Minimum priority for large processes */
lowmem_print(3, "lowmem_vm_shrink ma %d, large ma %d, largest %d, rss_threshold=%d\n",
min_adj, min_large_adj, largest, rss_threshold);
selected_oom_adj = min_adj;
read_lock(&tasklist_lock);
for_each_process(p) {
struct mm_struct *mm;
struct signal_struct *sig;
int oom_adj;
task_lock(p);
mm = p->mm;
sig = p->signal;
if (!mm || !sig) {
task_unlock(p);
continue;
}
oom_adj = sig->oom_adj;
vmsize = get_mm_hiwater_vm(mm);
rssize = get_mm_rss(mm) * PAGE_SIZE;
task_unlock(p);
if (vmsize <= 0)
continue;
/* Only look at cached processes */
if (oom_adj < min_adj) {
/* Is this a very large home process in the background? */
if ((oom_adj > min_large_adj) && (rssize >= rss_threshold)) {
selected = p;
selected_vmsize = vmsize;
selected_oom_adj = oom_adj;
lowmem_print(2, "lowmem_shrink override %d (%s), adj %d, vm size %d, rs size %d to kill\n" ,p->pid, p->comm, oom_adj, vmsize, rssize);
break;
}
continue;
}
/* Is this process a better fit than last selected? */
if (selected) {
if (oom_adj < selected_oom_adj)
continue;
/* If looking for largest, ignore priority */
if ((largest || (oom_adj == selected_oom_adj)) &&
(vmsize <= selected_vmsize))
continue;
}
selected = p;
selected_vmsize = vmsize;
if (largest == 0) /* Do not filter by priority if searching for largest */
selected_oom_adj = oom_adj;
lowmem_print(2, "lowmem_shrink select %d (%s), adj %d, vm size %d, rs size %d to kill\n",
p->pid, p->comm, oom_adj, vmsize, rssize);
}
if (selected) {
spin_lock_irqsave(&lowmem_deathpending_lock, flags);
if (!lowmem_deathpending) {
lowmem_print(1,
"lowmem_shrink send sigkill to %d (%s), adj %d, vm size %d\n",
selected->pid, selected->comm,
selected_oom_adj, selected_vmsize);
lowmem_deathpending = selected;
task_free_register(&task_nb);
force_sig(SIGKILL, selected);
}
spin_unlock_irqrestore(&lowmem_deathpending_lock, flags);
}
lowmem_print(4, "lowmem_vm_shrink, saved %d\n", selected_vmsize);
read_unlock(&tasklist_lock);
return;
}
