• Marcelo Ricardo Leitner's avatar
    sctp: allow sctp_transmit_packet and others to use gfp · cea8768f
    Marcelo Ricardo Leitner authored
    Currently sctp_sendmsg() triggers some calls that will allocate memory
    with GFP_ATOMIC even when not necessary. In the case of
    sctp_packet_transmit it will allocate a linear skb that will be used to
    construct the packet and this may cause sends to fail due to ENOMEM more
    often than anticipated specially with big MTUs.
    This patch thus allows it to inherit gfp flags from upper calls so that
    it can use GFP_KERNEL if it was triggered by a sctp_sendmsg call or
    similar. All others, like retransmits or flushes started from BH, are
    still allocated using GFP_ATOMIC.
    In netperf tests this didn't result in any performance drawbacks when
    memory is not too fragmented and made it trigger ENOMEM way less often.
    Signed-off-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
sm.h 15.2 KB