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authorLennart Poettering <lennart@poettering.net>2014-10-30 17:36:02 +0100
committerLennart Poettering <lennart@poettering.net>2014-10-30 17:36:02 +0100
commitc79e98eadd3056a36a662699fa650db5b1bca0c3 (patch)
tree456bcce009973aafa5269f62a4e04f34c339f5e6 /src/journal/journald-rate-limit.c
parentdd4540da0e1f983540d862cc657df7161a3bdd06 (diff)
journal: when sending huge log messages prefer memfds over temporary files in /dev/shm
Previously when a log message grew beyond the maximum AF_UNIX/SOCK_DGRAM datagram limit we'd send an fd to a deleted file in /dev/shm instead. Because the sender could still modify the file after delivery we had to immediately copy the data on the receiving side. With memfds we can optimize this logic, and also remove the dependency on /dev/shm: simply send a sealed memfd around, and if we detect the seal memory map the fd and use it directly.
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