Add cgroupfs interface to memcg dirty page limits: Direct write-out is controlled with: - memory.dirty_ratio - memory.dirty_limit_in_bytes
Background write-out is controlled with: - memory.dirty_background_ratio - memory.dirty_background_limit_bytes Other memcg cgroupfs files support 'M', 'm', 'k', 'K', 'g' and 'G' suffixes for byte counts. This patch provides the same functionality for memory.dirty_limit_in_bytes and memory.dirty_background_limit_bytes. Signed-off-by: Andrea Righi <[email protected]> Signed-off-by: Balbir Singh <[email protected]> Signed-off-by: Greg Thelen <[email protected]> --- Changelog since v1: - Renamed newly created proc files: - memory.dirty_bytes -> memory.dirty_limit_in_bytes - memory.dirty_background_bytes -> memory.dirty_background_limit_in_bytes - Allow [kKmMgG] suffixes for newly created dirty limit value cgroupfs files. mm/memcontrol.c | 116 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 116 insertions(+), 0 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 412ce73..580e665 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -100,6 +100,13 @@ enum mem_cgroup_stat_index { MEM_CGROUP_STAT_NSTATS, }; +enum { + MEM_CGROUP_DIRTY_RATIO, + MEM_CGROUP_DIRTY_LIMIT_IN_BYTES, + MEM_CGROUP_DIRTY_BACKGROUND_RATIO, + MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES, +}; + struct mem_cgroup_stat_cpu { s64 count[MEM_CGROUP_STAT_NSTATS]; }; @@ -4311,6 +4318,91 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp, return 0; } +static u64 mem_cgroup_dirty_read(struct cgroup *cgrp, struct cftype *cft) +{ + struct mem_cgroup *mem = mem_cgroup_from_cont(cgrp); + bool root; + + root = mem_cgroup_is_root(mem); + + switch (cft->private) { + case MEM_CGROUP_DIRTY_RATIO: + return root ? vm_dirty_ratio : mem->dirty_param.dirty_ratio; + case MEM_CGROUP_DIRTY_LIMIT_IN_BYTES: + return root ? vm_dirty_bytes : mem->dirty_param.dirty_bytes; + case MEM_CGROUP_DIRTY_BACKGROUND_RATIO: + return root ? dirty_background_ratio : + mem->dirty_param.dirty_background_ratio; + case MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES: + return root ? dirty_background_bytes : + mem->dirty_param.dirty_background_bytes; + default: + BUG(); + } +} + +static int +mem_cgroup_dirty_write_string(struct cgroup *cgrp, struct cftype *cft, + const char *buffer) +{ + struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); + int type = cft->private; + int ret = -EINVAL; + unsigned long long val; + + if (cgrp->parent == NULL) + return ret; + + switch (type) { + case MEM_CGROUP_DIRTY_LIMIT_IN_BYTES: + /* This function does all necessary parse...reuse it */ + ret = res_counter_memparse_write_strategy(buffer, &val); + if (ret) + break; + memcg->dirty_param.dirty_bytes = val; + memcg->dirty_param.dirty_ratio = 0; + break; + case MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES: + ret = res_counter_memparse_write_strategy(buffer, &val); + if (ret) + break; + memcg->dirty_param.dirty_background_bytes = val; + memcg->dirty_param.dirty_background_ratio = 0; + break; + default: + BUG(); + break; + } + return ret; +} + +static int +mem_cgroup_dirty_write(struct cgroup *cgrp, struct cftype *cft, u64 val) +{ + struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp); + int type = cft->private; + + if (cgrp->parent == NULL) + return -EINVAL; + if ((type == MEM_CGROUP_DIRTY_RATIO || + type == MEM_CGROUP_DIRTY_BACKGROUND_RATIO) && val > 100) + return -EINVAL; + switch (type) { + case MEM_CGROUP_DIRTY_RATIO: + memcg->dirty_param.dirty_ratio = val; + memcg->dirty_param.dirty_bytes = 0; + break; + case MEM_CGROUP_DIRTY_BACKGROUND_RATIO: + memcg->dirty_param.dirty_background_ratio = val; + memcg->dirty_param.dirty_background_bytes = 0; + break; + default: + BUG(); + break; + } + return 0; +} + static struct cftype mem_cgroup_files[] = { { .name = "usage_in_bytes", @@ -4374,6 +4466,30 @@ static struct cftype mem_cgroup_files[] = { .unregister_event = mem_cgroup_oom_unregister_event, .private = MEMFILE_PRIVATE(_OOM_TYPE, OOM_CONTROL), }, + { + .name = "dirty_ratio", + .read_u64 = mem_cgroup_dirty_read, + .write_u64 = mem_cgroup_dirty_write, + .private = MEM_CGROUP_DIRTY_RATIO, + }, + { + .name = "dirty_limit_in_bytes", + .read_u64 = mem_cgroup_dirty_read, + .write_string = mem_cgroup_dirty_write_string, + .private = MEM_CGROUP_DIRTY_LIMIT_IN_BYTES, + }, + { + .name = "dirty_background_ratio", + .read_u64 = mem_cgroup_dirty_read, + .write_u64 = mem_cgroup_dirty_write, + .private = MEM_CGROUP_DIRTY_BACKGROUND_RATIO, + }, + { + .name = "dirty_background_limit_in_bytes", + .read_u64 = mem_cgroup_dirty_read, + .write_string = mem_cgroup_dirty_write_string, + .private = MEM_CGROUP_DIRTY_BACKGROUND_LIMIT_IN_BYTES, + }, }; #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP -- 1.7.1 _______________________________________________ Containers mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/containers _______________________________________________ Devel mailing list [email protected] https://openvz.org/mailman/listinfo/devel
