diff options
| author | Soheil Hassas Yeganeh | 2020-09-14 17:52:09 -0400 |
|---|---|---|
| committer | David S. Miller | 2020-09-14 16:58:24 -0700 |
| commit | 8ba3c9d1c6d75d1e6af2087278b30e17f68e1fff (patch) | |
| tree | df6b4e7b5a19abda719a7ad98e369630f70af454 /mm/mempolicy.c | |
| parent | ed6d9b0228132fee03314b276d946fc3f0cc9e4f (diff) | |
tcp: return EPOLLOUT from tcp_poll only when notsent_bytes is half the limit
If there was any event available on the TCP socket, tcp_poll()
will be called to retrieve all the events. In tcp_poll(), we call
sk_stream_is_writeable() which returns true as long as we are at least
one byte below notsent_lowat. This will result in quite a few
spurious EPLLOUT and frequent tiny sendmsg() calls as a result.
Similar to sk_stream_write_space(), use __sk_stream_is_writeable
with a wake value of 1, so that we set EPOLLOUT only if half the
space is available for write.
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'mm/mempolicy.c')
0 files changed, 0 insertions, 0 deletions