![Tejun Heo](/assets/img/avatar_default.png)
Percpu allocator now supports allocation mask. Add @gfp to percpu_counter_init() so that !GFP_KERNEL allocation masks can be used with percpu_counters too. We could have left percpu_counter_init() alone and added percpu_counter_init_gfp(); however, the number of users isn't that high and introducing _gfp variants to all percpu data structures would be quite ugly, so let's just do the conversion. This is the one with the most users. Other percpu data structures are a lot easier to convert. This patch doesn't make any functional difference. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Jan Kara <jack@suse.cz> Acked-by: "David S. Miller" <davem@davemloft.net> Cc: x86@kernel.org Cc: Jens Axboe <axboe@kernel.dk> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org>
229 lines
5.5 KiB
C
229 lines
5.5 KiB
C
#include <net/tcp.h>
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#include <net/tcp_memcontrol.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <linux/nsproxy.h>
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#include <linux/memcontrol.h>
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#include <linux/module.h>
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int tcp_init_cgroup(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
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{
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/*
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* The root cgroup does not use res_counters, but rather,
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* rely on the data already collected by the network
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* subsystem
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*/
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struct res_counter *res_parent = NULL;
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struct cg_proto *cg_proto, *parent_cg;
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struct mem_cgroup *parent = parent_mem_cgroup(memcg);
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return 0;
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cg_proto->sysctl_mem[0] = sysctl_tcp_mem[0];
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cg_proto->sysctl_mem[1] = sysctl_tcp_mem[1];
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cg_proto->sysctl_mem[2] = sysctl_tcp_mem[2];
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cg_proto->memory_pressure = 0;
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cg_proto->memcg = memcg;
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parent_cg = tcp_prot.proto_cgroup(parent);
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if (parent_cg)
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res_parent = &parent_cg->memory_allocated;
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res_counter_init(&cg_proto->memory_allocated, res_parent);
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percpu_counter_init(&cg_proto->sockets_allocated, 0, GFP_KERNEL);
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return 0;
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}
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EXPORT_SYMBOL(tcp_init_cgroup);
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void tcp_destroy_cgroup(struct mem_cgroup *memcg)
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{
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struct cg_proto *cg_proto;
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return;
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percpu_counter_destroy(&cg_proto->sockets_allocated);
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}
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EXPORT_SYMBOL(tcp_destroy_cgroup);
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static int tcp_update_limit(struct mem_cgroup *memcg, u64 val)
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{
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struct cg_proto *cg_proto;
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int i;
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int ret;
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return -EINVAL;
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if (val > RES_COUNTER_MAX)
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val = RES_COUNTER_MAX;
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ret = res_counter_set_limit(&cg_proto->memory_allocated, val);
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if (ret)
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return ret;
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for (i = 0; i < 3; i++)
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cg_proto->sysctl_mem[i] = min_t(long, val >> PAGE_SHIFT,
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sysctl_tcp_mem[i]);
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if (val == RES_COUNTER_MAX)
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clear_bit(MEMCG_SOCK_ACTIVE, &cg_proto->flags);
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else if (val != RES_COUNTER_MAX) {
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/*
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* The active bit needs to be written after the static_key
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* update. This is what guarantees that the socket activation
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* function is the last one to run. See sock_update_memcg() for
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* details, and note that we don't mark any socket as belonging
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* to this memcg until that flag is up.
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*
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* We need to do this, because static_keys will span multiple
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* sites, but we can't control their order. If we mark a socket
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* as accounted, but the accounting functions are not patched in
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* yet, we'll lose accounting.
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*
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* We never race with the readers in sock_update_memcg(),
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* because when this value change, the code to process it is not
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* patched in yet.
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*
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* The activated bit is used to guarantee that no two writers
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* will do the update in the same memcg. Without that, we can't
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* properly shutdown the static key.
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*/
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if (!test_and_set_bit(MEMCG_SOCK_ACTIVATED, &cg_proto->flags))
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static_key_slow_inc(&memcg_socket_limit_enabled);
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set_bit(MEMCG_SOCK_ACTIVE, &cg_proto->flags);
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}
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return 0;
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}
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static ssize_t tcp_cgroup_write(struct kernfs_open_file *of,
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char *buf, size_t nbytes, loff_t off)
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{
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struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
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unsigned long long val;
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int ret = 0;
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buf = strstrip(buf);
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switch (of_cft(of)->private) {
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case RES_LIMIT:
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/* see memcontrol.c */
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ret = res_counter_memparse_write_strategy(buf, &val);
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if (ret)
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break;
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ret = tcp_update_limit(memcg, val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret ?: nbytes;
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}
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static u64 tcp_read_stat(struct mem_cgroup *memcg, int type, u64 default_val)
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{
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struct cg_proto *cg_proto;
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return default_val;
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return res_counter_read_u64(&cg_proto->memory_allocated, type);
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}
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static u64 tcp_read_usage(struct mem_cgroup *memcg)
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{
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struct cg_proto *cg_proto;
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return atomic_long_read(&tcp_memory_allocated) << PAGE_SHIFT;
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return res_counter_read_u64(&cg_proto->memory_allocated, RES_USAGE);
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}
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static u64 tcp_cgroup_read(struct cgroup_subsys_state *css, struct cftype *cft)
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{
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struct mem_cgroup *memcg = mem_cgroup_from_css(css);
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u64 val;
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switch (cft->private) {
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case RES_LIMIT:
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val = tcp_read_stat(memcg, RES_LIMIT, RES_COUNTER_MAX);
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break;
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case RES_USAGE:
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val = tcp_read_usage(memcg);
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break;
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case RES_FAILCNT:
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case RES_MAX_USAGE:
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val = tcp_read_stat(memcg, cft->private, 0);
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break;
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default:
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BUG();
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}
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return val;
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}
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static ssize_t tcp_cgroup_reset(struct kernfs_open_file *of,
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char *buf, size_t nbytes, loff_t off)
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{
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struct mem_cgroup *memcg;
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struct cg_proto *cg_proto;
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memcg = mem_cgroup_from_css(of_css(of));
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cg_proto = tcp_prot.proto_cgroup(memcg);
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if (!cg_proto)
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return nbytes;
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switch (of_cft(of)->private) {
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case RES_MAX_USAGE:
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res_counter_reset_max(&cg_proto->memory_allocated);
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break;
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case RES_FAILCNT:
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res_counter_reset_failcnt(&cg_proto->memory_allocated);
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break;
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}
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return nbytes;
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}
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static struct cftype tcp_files[] = {
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{
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.name = "kmem.tcp.limit_in_bytes",
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.write = tcp_cgroup_write,
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.read_u64 = tcp_cgroup_read,
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.private = RES_LIMIT,
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},
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{
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.name = "kmem.tcp.usage_in_bytes",
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.read_u64 = tcp_cgroup_read,
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.private = RES_USAGE,
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},
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{
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.name = "kmem.tcp.failcnt",
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.private = RES_FAILCNT,
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.write = tcp_cgroup_reset,
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.read_u64 = tcp_cgroup_read,
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},
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{
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.name = "kmem.tcp.max_usage_in_bytes",
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.private = RES_MAX_USAGE,
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.write = tcp_cgroup_reset,
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.read_u64 = tcp_cgroup_read,
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},
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{ } /* terminate */
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};
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static int __init tcp_memcontrol_init(void)
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{
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WARN_ON(cgroup_add_legacy_cftypes(&memory_cgrp_subsys, tcp_files));
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return 0;
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}
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__initcall(tcp_memcontrol_init);
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