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Ran 11 Mar 2020 09:00AM UTC

Files 52

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Committed 11 Mar 2020 08:41AM UTC coverage: 92.392% (+2.1%) from 90.263%

Job # 369.1

Build Type

Pull #204

travis-ci

Committed by

web-flow

Commit Message

syscalls: use gperf for lookup

use gperf to generate a perfect hash to lookup syscall names.   It
improves significantly the complexity for seccomp_syscall_resolve_name.*
since it replaces the expensive strcmp for each syscall in the
database, with a lookup table.

The complexity for syscall_resolve_num is not changed and it
uses the linear search, that is anyway less expensive than
seccomp_syscall_resolve_name.* as it uses an index for comparison
instead of doing a string comparison.

On my machine, calling 1000 seccomp_syscall_resolve_name_arch and
seccomp_syscall_resolve_num_arch over the entire syscalls DB passed
from ~0.45 sec to ~0.06s.

Closes: https://github.com/seccomp/libseccomp/issues/207

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

Pull Request Pull Request #204: [WIP] syscalls: use gperf for lookups

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3874 of 4193 relevant lines covered (92.39%)

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seccomp / libseccomp / 369 / 1
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