static int memcg_initialize (xcgroup_ns_t *ns, xcgroup_t *cg,
char *path, uint64_t mem_limit, uid_t uid, gid_t gid)
{
uint64_t mlb = mem_limit_in_bytes (mem_limit);
uint64_t mls = swap_limit_in_bytes (mem_limit);
if (xcgroup_create (ns, cg, path, uid, gid) != XCGROUP_SUCCESS)
return -1;
if (xcgroup_instanciate (cg) != XCGROUP_SUCCESS) {
xcgroup_destroy (cg);
return -1;
}
xcgroup_set_param (cg, "memory.use_hierarchy","1");
xcgroup_set_uint64_param (cg, "memory.limit_in_bytes", mlb);
xcgroup_set_uint64_param (cg, "memory.memsw.limit_in_bytes", mls);
info ("task/cgroup: %s: alloc=%luMB mem.limit=%luMB memsw.limit=%luMB",
path,
(unsigned long) mem_limit,
(unsigned long) mlb/(1024*1024),
(unsigned long) mls/(1024*1024));
return 0;
}
/*
* Return configured swap limit in bytes given a memory limit in MB.
*
* Swap limit is calculated as:
*
* mem_limit_in_bytes + (configured_swap_percent * allocated_mem_in_bytes)
*/
static uint64_t swap_limit_in_bytes (uint64_t mem)
{
uint64_t swap;
/*
* If mem == 0 assume "unlimited" and use totalram.
*/
swap = percent_in_bytes (mem ? mem : totalram, allowed_swap_space);
mem = mem_limit_in_bytes (mem) + swap;
if (mem < min_ram_space)
return (min_ram_space);
if (mem > max_swap)
return (max_swap);
return (mem);
}
static int memcg_initialize (xcgroup_ns_t *ns, xcgroup_t *cg,
char *path, uint64_t mem_limit, uid_t uid,
gid_t gid, uint32_t notify)
{
uint64_t mlb = mem_limit_in_bytes (mem_limit);
uint64_t mls = swap_limit_in_bytes (mem_limit);
if (xcgroup_create (ns, cg, path, uid, gid) != XCGROUP_SUCCESS)
return -1;
cg->notify = notify;
if (xcgroup_instantiate (cg) != XCGROUP_SUCCESS) {
xcgroup_destroy (cg);
return -1;
}
xcgroup_set_param (cg, "memory.use_hierarchy", "1");
/* when RAM space has not to be constrained and we are here, it
* means that only Swap space has to be constrained. Thus set
* RAM space limit to the mem+swap limit too */
if ( ! constrain_ram_space )
mlb = mls;
xcgroup_set_uint64_param (cg, "memory.limit_in_bytes", mlb);
/*
* Also constrain kernel memory (if available).
* See https://lwn.net/Articles/516529/
*/
xcgroup_set_uint64_param (cg, "memory.kmem.limit_in_bytes", mlb);
/* this limit has to be set only if ConstrainSwapSpace is set to yes */
if ( constrain_swap_space ) {
xcgroup_set_uint64_param (cg, "memory.memsw.limit_in_bytes",
mls);
info ("task/cgroup: %s: alloc=%luMB mem.limit=%luMB "
"memsw.limit=%luMB", path,
(unsigned long) mem_limit,
(unsigned long) mlb/(1024*1024),
(unsigned long) mls/(1024*1024));
} else {
info ("task/cgroup: %s: alloc=%luMB mem.limit=%luMB "
"memsw.limit=unlimited", path,
(unsigned long) mem_limit,
(unsigned long) mlb/(1024*1024));
}
return 0;
}