Cpuset hardwall flag: switch cpusets to use the bulk cgroup_add_files() API
Currently the cpusets mem_exclusive flag is overloaded to mean both "no-overlapping" and "no GFP_KERNEL allocations outside this cpuset". These patches add a new mem_hardwall flag with just the allocation restriction part of the mem_exclusive semantics, without breaking backwards-compatibility for those who continue to use just mem_exclusive. Additionally, the cgroup control file registration for cpusets is cleaned up to reduce boilerplate. This patch: This change tidies up the cpusets control file definitions, and reduces the amount of boilerplate required to add/change control files in the future. Signed-off-by: Paul Menage <menage@google.com> Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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100
kernel/cpuset.c
100
kernel/cpuset.c
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@ -1445,53 +1445,76 @@ static u64 cpuset_read_u64(struct cgroup *cont, struct cftype *cft)
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* for the common functions, 'private' gives the type of file
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*/
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static struct cftype cft_cpus = {
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static struct cftype files[] = {
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{
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.name = "cpus",
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.read = cpuset_common_file_read,
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.write = cpuset_common_file_write,
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.private = FILE_CPULIST,
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};
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},
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static struct cftype cft_mems = {
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{
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.name = "mems",
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.read = cpuset_common_file_read,
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.write = cpuset_common_file_write,
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.private = FILE_MEMLIST,
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};
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},
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static struct cftype cft_cpu_exclusive = {
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{
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.name = "cpu_exclusive",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_CPU_EXCLUSIVE,
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};
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},
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static struct cftype cft_mem_exclusive = {
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{
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.name = "mem_exclusive",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_MEM_EXCLUSIVE,
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};
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},
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static struct cftype cft_sched_load_balance = {
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{
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.name = "sched_load_balance",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_SCHED_LOAD_BALANCE,
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};
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},
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static struct cftype cft_sched_relax_domain_level = {
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{
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.name = "sched_relax_domain_level",
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.read = cpuset_common_file_read,
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.write = cpuset_common_file_write,
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_SCHED_RELAX_DOMAIN_LEVEL,
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};
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},
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static struct cftype cft_memory_migrate = {
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{
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.name = "memory_migrate",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_MEMORY_MIGRATE,
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},
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{
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.name = "memory_pressure",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_MEMORY_PRESSURE,
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},
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{
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.name = "memory_spread_page",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_SPREAD_PAGE,
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},
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{
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.name = "memory_spread_slab",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_SPREAD_SLAB,
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},
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};
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static struct cftype cft_memory_pressure_enabled = {
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@ -1501,57 +1524,18 @@ static struct cftype cft_memory_pressure_enabled = {
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.private = FILE_MEMORY_PRESSURE_ENABLED,
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};
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static struct cftype cft_memory_pressure = {
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.name = "memory_pressure",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_MEMORY_PRESSURE,
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};
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static struct cftype cft_spread_page = {
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.name = "memory_spread_page",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_SPREAD_PAGE,
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};
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static struct cftype cft_spread_slab = {
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.name = "memory_spread_slab",
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.read_u64 = cpuset_read_u64,
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.write_u64 = cpuset_write_u64,
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.private = FILE_SPREAD_SLAB,
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};
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static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
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{
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int err;
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if ((err = cgroup_add_file(cont, ss, &cft_cpus)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_mems)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_cpu_exclusive)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_mem_exclusive)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_memory_migrate)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_sched_load_balance)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss,
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&cft_sched_relax_domain_level)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_memory_pressure)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_spread_page)) < 0)
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return err;
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if ((err = cgroup_add_file(cont, ss, &cft_spread_slab)) < 0)
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err = cgroup_add_files(cont, ss, files, ARRAY_SIZE(files));
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if (err)
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return err;
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/* memory_pressure_enabled is in root cpuset only */
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if (err == 0 && !cont->parent)
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if (!cont->parent)
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err = cgroup_add_file(cont, ss,
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&cft_memory_pressure_enabled);
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return 0;
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return err;
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}
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/*
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