From: Eric Dumazet <eric.duma...@gmail.com>
Date: Tue, 19 May 2015 13:26:55 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> In commit 8e4d980ac215 ("tcp: fix behavior for epoll edge trigger")
> we fixed a possible hang of TCP sockets under memory pressure,
> by allowing sk_stream_alloc_skb() to use sk_forced_mem_schedule()
> if no packet is in socket write queue.
>
> It turns out there are other cases where we want to force memory
> schedule :
>
> tcp_fragment() & tso_fragment() need to split a big TSO packet into
> two smaller ones. If we block here because of TCP memory pressure,
> we can effectively block TCP socket from sending new data.
> If no further ACK is coming, this hang would be definitive, and socket
> has no chance to effectively reduce its memory usage.
>
> Signed-off-by: Eric Dumazet <eduma...@google.com>
Looks good, applied, thanks Eric.
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