From 351ab5fbadd933da771a1bd008eff3960360cfc5 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sat, 28 Oct 2023 21:49:50 +0200
Subject: LibC: Skip using cache if length requested is longer than the cache
block
This avoid a bunch of extra systemcalls that would have to be made to
read each portion into a cache block.
---
userland/libc/stdio/stdin.c | 8 ++++++++
1 file changed, 8 insertions(+)
(limited to 'userland/libc/stdio/stdin.c')
diff --git a/userland/libc/stdio/stdin.c b/userland/libc/stdio/stdin.c
index e84ea7e..98189e2 100644
--- a/userland/libc/stdio/stdin.c
+++ b/userland/libc/stdio/stdin.c
@@ -26,6 +26,14 @@ size_t non_cache_read_fd(FILE *f, unsigned char *s, size_t l) {
size_t read_fd(FILE *f, unsigned char *s, size_t l) {
if (0 == l)
return 0;
+
+ // Skip using cache if the length being requested if longer than or
+ // equal to the cache block size. This avoids doing a bunch of extra
+ // syscalls
+ if (l >= 4096) {
+ return non_cache_read_fd(f, s, l);
+ }
+
if (!f->read_buffer) {
f->read_buffer = malloc(4096);
f->read_buffer_stored = 0;
--
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