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author | David S. Miller <davem@davemloft.net> | 2023-08-13 14:21:38 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2023-08-13 14:21:38 +0300 |
commit | 86f03776f6d58558912bc05158fa75add1886aca (patch) | |
tree | 7a98005eb4c3cc91e5bfe987db7f8b6da28e072d /net/netlink/af_netlink.c | |
parent | 3e6860ec3a2252249e310b0e6e88e2258171b3d0 (diff) | |
parent | 031c44b7527aec2f22ddaae4bcd8b085ff810ec4 (diff) | |
download | linux-86f03776f6d58558912bc05158fa75add1886aca.tar.xz |
Merge branch 'tcp-oom-probe'
Menglong Dong says:
====================
net: tcp: support probing OOM
In this series, we make some small changes to make the tcp
retransmission become zero-window probes if the receiver drops the skb
because of memory pressure.
In the 1st patch, we reply a zero-window ACK if the skb is dropped
because out of memory, instead of dropping the skb silently.
In the 2nd patch, we allow a zero-window ACK to update the window.
In the 3rd patch, fix unexcepted socket die when snd_wnd is 0 in
tcp_retransmit_timer().
In the 4th patch, we refactor the debug message in
tcp_retransmit_timer() to make it more correct.
After these changes, the tcp can probe the OOM of the receiver forever.
Changes since v3:
- make the timeout "2 * TCP_RTO_MAX" in the 3rd patch
- tp->retrans_stamp is not based on jiffies and can't be compared with
icsk->icsk_timeout in the 3rd patch. Fix it.
- introduce the 4th patch
Changes since v2:
- refactor the code to avoid code duplication in the 1st patch
- use after() instead of max() in tcp_rtx_probe0_timed_out()
Changes since v1:
- send 0 rwin ACK for the receive queue empty case when necessary in the
1st patch
- send the ACK immediately by using the ICSK_ACK_NOW flag in the 1st
patch
- consider the case of the connection restart from idle, as Neal comment,
in the 3rd patch
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink/af_netlink.c')
0 files changed, 0 insertions, 0 deletions