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Revert "tcp: switch orphan_count to bare per-cpu counters"

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This reverts commit a342cb4772 which is
commit 19757cebf0c5016a1f36f7fe9810a9f0b33c0832 upstream.

The commit breaks the abi and we don't really need to worry about
Android on systems with greater than 256 CPUs at this point in time.

Bug: 161946584
Fixes: a342cb4772 ("tcp: switch orphan_count to bare per-cpu counters")
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ifeb445b4490db185eacc379fbcab2a3ed3b966fb
This commit is contained in:
Greg Kroah-Hartman
2021-11-19 14:21:03 +01:00
parent e101be336e
commit 971945b722
11 changed files with 38 additions and 49 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
net/ipv4/tcp.c
View File

@@ -282,8 +282,8 @@
#include <trace/hooks/ipv4.h>
DEFINE_PER_CPU(unsigned int, tcp_orphan_count);
EXPORT_PER_CPU_SYMBOL_GPL(tcp_orphan_count);
struct percpu_counter tcp_orphan_count;
EXPORT_SYMBOL_GPL(tcp_orphan_count);
long sysctl_tcp_mem[3] __read_mostly;
EXPORT_SYMBOL(sysctl_tcp_mem);
@@ -2399,36 +2399,11 @@ void tcp_shutdown(struct sock *sk, int how)
}
EXPORT_SYMBOL(tcp_shutdown);
int tcp_orphan_count_sum(void)
{
int i, total = 0;
for_each_possible_cpu(i)
total += per_cpu(tcp_orphan_count, i);
return max(total, 0);
}
static int tcp_orphan_cache;
static struct timer_list tcp_orphan_timer;
#define TCP_ORPHAN_TIMER_PERIOD msecs_to_jiffies(100)
static void tcp_orphan_update(struct timer_list *unused)
{
WRITE_ONCE(tcp_orphan_cache, tcp_orphan_count_sum());
mod_timer(&tcp_orphan_timer, jiffies + TCP_ORPHAN_TIMER_PERIOD);
}
static bool tcp_too_many_orphans(int shift)
{
return READ_ONCE(tcp_orphan_cache) << shift > sysctl_tcp_max_orphans;
}
bool tcp_check_oom(struct sock *sk, int shift)
{
bool too_many_orphans, out_of_socket_memory;
too_many_orphans = tcp_too_many_orphans(shift);
too_many_orphans = tcp_too_many_orphans(sk, shift);
out_of_socket_memory = tcp_out_of_memory(sk);
if (too_many_orphans)
@@ -2538,7 +2513,7 @@ adjudge_to_death:
/* remove backlog if any, without releasing ownership. */
__release_sock(sk);
this_cpu_inc(tcp_orphan_count);
percpu_counter_inc(sk->sk_prot->orphan_count);
/* Have we already been destroyed by a softirq or backlog? */
if (state != TCP_CLOSE && sk->sk_state == TCP_CLOSE)
@@ -4175,10 +4150,7 @@ void __init tcp_init(void)
sizeof_field(struct sk_buff, cb));
percpu_counter_init(&tcp_sockets_allocated, 0, GFP_KERNEL);
timer_setup(&tcp_orphan_timer, tcp_orphan_update, TIMER_DEFERRABLE);
mod_timer(&tcp_orphan_timer, jiffies + TCP_ORPHAN_TIMER_PERIOD);
percpu_counter_init(&tcp_orphan_count, 0, GFP_KERNEL);
inet_hashinfo_init(&tcp_hashinfo);
inet_hashinfo2_init(&tcp_hashinfo, "tcp_listen_portaddr_hash",
thash_entries, 21, /* one slot per 2 MB*/