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| author | Jarek Poplawski <jarkao2@gmail.com> | 2009-07-14 10:33:08 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-07-20 16:39:25 +0200 |
| commit | c3059477fce2d956a0bb3e04357324780c5d8eeb (patch) | |
| tree | c08cd660873667268132d556c2b66d7f9725a173 /net/ipv4/tcp.c | |
| parent | vlan: Propagate physical MTU changes (diff) | |
| download | linux-c3059477fce2d956a0bb3e04357324780c5d8eeb.tar.xz linux-c3059477fce2d956a0bb3e04357324780c5d8eeb.zip | |
ipv4: Use synchronize_rcu() during trie_rebalance()
During trie_rebalance() we free memory after resizing with call_rcu(),
but large updates, especially with PREEMPT_NONE configs, can cause
memory stresses, so this patch calls synchronize_rcu() in
tnode_free_flush() after each sync_pages to guarantee such freeing
(especially before resizing the root node).
The value of sync_pages = 128 is based on Pawel Staszewski's tests as
the lowest which doesn't hinder updating times. (For testing purposes
there was a sysfs module parameter to change it on demand, but it's
removed until we're sure it could be really useful.)
The patch is based on suggestions by: Paul E. McKenney
<paulmck@linux.vnet.ibm.com>
Reported-by: Pawel Staszewski <pstaszewski@itcare.pl>
Tested-by: Pawel Staszewski <pstaszewski@itcare.pl>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
0 files changed, 0 insertions, 0 deletions