From 1bc5a47044c523fe7936c3916fce7bcf3fcfb3f9 Mon Sep 17 00:00:00 2001
From: Jakub Hrozek <jhrozek@redhat.com>
Date: Thu, 29 Sep 2022 13:00:34 +0200
Subject: [PATCH] util: Optimize slice lengths in UnionSyscalls

---
 internal/pkg/util/union_syscalls.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/internal/pkg/util/union_syscalls.go b/internal/pkg/util/union_syscalls.go
index 0b76a7b411..5eaf80bdcd 100644
--- a/internal/pkg/util/union_syscalls.go
+++ b/internal/pkg/util/union_syscalls.go
@@ -23,7 +23,12 @@ import (
 )
 
 func UnionSyscalls(baseSyscalls, appliedSyscalls []*seccompprofile.Syscall) []*seccompprofile.Syscall {
-	allSyscalls := make(map[seccomp.Action]map[string]bool)
+	longestLen := len(baseSyscalls)
+	if len(appliedSyscalls) > longestLen {
+		longestLen = len(appliedSyscalls)
+	}
+
+	allSyscalls := make(map[seccomp.Action]map[string]bool, longestLen)
 	for _, b := range baseSyscalls {
 		allSyscalls[b.Action] = make(map[string]bool)
 		for _, n := range b.Names {
@@ -38,7 +43,7 @@ func UnionSyscalls(baseSyscalls, appliedSyscalls []*seccompprofile.Syscall) []*s
 			allSyscalls[s.Action][n] = true
 		}
 	}
-	finalSyscalls := make([]*seccompprofile.Syscall, 0, len(appliedSyscalls)+len(baseSyscalls))
+	finalSyscalls := make([]*seccompprofile.Syscall, 0, longestLen)
 	for action, names := range allSyscalls {
 		syscall := seccompprofile.Syscall{
 			Action: action,