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memcg: extract mem_group_usage() from mem_cgroup_read()
Helper to get memory or mem+swap usage of the cgroup. Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Dan Malek <dan@embeddedalley.com> Cc: Vladislav Buzov <vbuzov@embeddedalley.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Alexander Shishkin <virtuoso@slind.org> Cc: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -2857,40 +2857,50 @@ mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem,
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*val = d.val;
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}
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static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap)
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{
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u64 idx_val, val;
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if (!mem_cgroup_is_root(mem)) {
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if (!swap)
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return res_counter_read_u64(&mem->res, RES_USAGE);
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else
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return res_counter_read_u64(&mem->memsw, RES_USAGE);
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}
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mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE, &idx_val);
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val = idx_val;
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mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS, &idx_val);
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val += idx_val;
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if (swap) {
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mem_cgroup_get_recursive_idx_stat(mem,
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MEM_CGROUP_STAT_SWAPOUT, &idx_val);
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val += idx_val;
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}
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return val << PAGE_SHIFT;
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}
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static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
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{
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struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
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u64 idx_val, val;
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u64 val;
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int type, name;
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type = MEMFILE_TYPE(cft->private);
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name = MEMFILE_ATTR(cft->private);
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switch (type) {
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case _MEM:
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if (name == RES_USAGE && mem_cgroup_is_root(mem)) {
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mem_cgroup_get_recursive_idx_stat(mem,
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MEM_CGROUP_STAT_CACHE, &idx_val);
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val = idx_val;
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mem_cgroup_get_recursive_idx_stat(mem,
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MEM_CGROUP_STAT_RSS, &idx_val);
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val += idx_val;
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val <<= PAGE_SHIFT;
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} else
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if (name == RES_USAGE)
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val = mem_cgroup_usage(mem, false);
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else
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val = res_counter_read_u64(&mem->res, name);
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break;
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case _MEMSWAP:
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if (name == RES_USAGE && mem_cgroup_is_root(mem)) {
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mem_cgroup_get_recursive_idx_stat(mem,
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MEM_CGROUP_STAT_CACHE, &idx_val);
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val = idx_val;
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mem_cgroup_get_recursive_idx_stat(mem,
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MEM_CGROUP_STAT_RSS, &idx_val);
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val += idx_val;
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mem_cgroup_get_recursive_idx_stat(mem,
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MEM_CGROUP_STAT_SWAPOUT, &idx_val);
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val += idx_val;
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val <<= PAGE_SHIFT;
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} else
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if (name == RES_USAGE)
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val = mem_cgroup_usage(mem, true);
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else
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val = res_counter_read_u64(&mem->memsw, name);
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break;
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default:
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