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Reduce ftrace overhead to 280ns

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This commit is contained in:
Justine Tunney 2022-05-20 04:46:42 -07:00
parent 4245da19e2
commit c8a2f04058
2 changed files with 33 additions and 17 deletions
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10
libc/intrin/kprintf.greg.c
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@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#define ShouldUseMsabiAttribute() 1
#include "libc/bits/bits.h"
#include "libc/bits/likely.h"
#include "libc/bits/safemacros.internal.h"
#include "libc/bits/weaken.h"
@ -707,9 +708,14 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt, va_list va,
if (p < e) *p = hash;
++p;
}
for (; cols > i; --cols) {
if (p < e) {
while (cols > i) {
if (p + 8 < e && cols - i > 8) {
WRITE64LE(p, 0x2020202020202020);
cols -= 8;
p += 8;
} else if (p < e) {
*p++ = ' ';
--cols;
} else {
p = kadvance(p, e, cols - i);
break;