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authorStefano Brivio <sbrivio@redhat.com>2024-02-02 00:22:16 +0100
committerStefano Brivio <sbrivio@redhat.com>2024-02-14 01:10:11 +0100
commit7ee4e172679029e54f44f096d2e0ec85905c79de (patch)
treed33e57ae2000ea1cee68b1db8a4c21055bfdd043 /udp.c
parent78901eeae3b37c0e15f34512e5ea0c1b7acc4642 (diff)
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log: setlogmask(0) can actually result in a system call, don't use it
Before commit 32d07f5e59f2 ("passt, pasta: Completely avoid dynamic memory allocation"), we didn't store the current log mask in a variable, and we fetched it using setlogmask(0) wherever needed. But after that commit, we can use our log_mask copy instead. And we should: with recent glibc versions, setlogmask(0) actually results in a system call, which causes a substantial overhead with high transfer rates: we use setlogmask(0) even to decide we don't want to print debug messages. Now that we rely on log_mask in early stages, before setlogmask() is called, we need to initialise that variable to the special LOG_EMERG mask value right away: define LOG_EARLY to make this clearer, and, while at it, group conditions in vlogmsg() into something more terse. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
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