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| author |   Nikolay Aleksandrov <nikolay@redhat.com> | 2014-07-24 16:50:37 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-07-27 22:34:36 -0700 |
| commit | 1bab4c75075b84675b96992ac47580a57c26958d (patch) | |
| tree | d015ddcf9d9d16e423efb63e9ddbd46fb02d95c3 /net/ipv4/ip_fragment.c | |
| parent | inet: frag: use seqlock for hash rebuild (diff) | |
| download | linux-dev-1bab4c75075b84675b96992ac47580a57c26958d.tar.xz linux-dev-1bab4c75075b84675b96992ac47580a57c26958d.zip | |
inet: frag: set limits and make init_net's high_thresh limit global
This patch makes init_net's high_thresh limit to be the maximum for all
namespaces, thus introducing a global memory limit threshold equal to the
sum of the individual high_thresh limits which are capped.
It also introduces some sane minimums for low_thresh as it shouldn't be
able to drop below 0 (or > high_thresh in the unsigned case), and
overall low_thresh should not ever be above high_thresh, so we make the
following relations for a namespace:
init_net:
high_thresh - max(not capped), min(init_net low_thresh)
low_thresh - max(init_net high_thresh), min (0)
all other namespaces:
high_thresh = max(init_net high_thresh), min(namespace's low_thresh)
low_thresh = max(namespace's high_thresh), min(0)
The major issue with having low_thresh > high_thresh is that we'll
schedule eviction but never evict anything and thus rely only on the
timers.
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_fragment.c')
| -rw-r--r-- | net/ipv4/ip_fragment.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index ccee68dffd6e..634fc31aa243 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -700,14 +700,17 @@ static struct ctl_table ip4_frags_ns_ctl_table[] = { .data = &init_net.ipv4.frags.high_thresh, .maxlen = sizeof(int), .mode = 0644, - .proc_handler = proc_dointvec + .proc_handler = proc_dointvec_minmax, + .extra1 = &init_net.ipv4.frags.low_thresh }, { .procname = "ipfrag_low_thresh", .data = &init_net.ipv4.frags.low_thresh, .maxlen = sizeof(int), .mode = 0644, - .proc_handler = proc_dointvec + .proc_handler = proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &init_net.ipv4.frags.high_thresh }, { .procname = "ipfrag_time", @@ -752,7 +755,10 @@ static int __net_init ip4_frags_ns_ctl_register(struct net *net) goto err_alloc; table[0].data = &net->ipv4.frags.high_thresh; + table[0].extra1 = &net->ipv4.frags.low_thresh; + table[0].extra2 = &init_net.ipv4.frags.high_thresh; table[1].data = &net->ipv4.frags.low_thresh; + table[1].extra2 = &net->ipv4.frags.high_thresh; table[2].data = &net->ipv4.frags.timeout; /* Don't export sysctls to unprivileged users */ |