commit c0aa70ab2cff738f3af19327e2747a318c218c07
author Florian Mayer <fmayer@google.com> Mon Jun 24 15:49:20 2024 -0700
committer Florian Mayer <fmayer@google.com> Wed Jun 26 00:27:38 2024 +0000
tree 3c11ceddd34660b0050d308fd7c0c178f6cae8b4
parent 755f4828a312a674205282a23c4b3a7593c9f935

Reapply "[MTE] allocate ring buffer for stack history"

This reverts commit 45b29f13bbefd1edc1d16a15bb4c1f8e8d8068fc.

The observed slowdown was actually an artifact of stack alignment.

Change-Id: I3af8af33c624491124bfed07e869b4330adfacb3

libc/bionic/pthread_internal.h

diff --git a/libc/bionic/pthread_internal.h b/libc/bionic/pthread_internal.h
index b0e9461..b270a06 100644
--- a/libc/bionic/pthread_internal.h
+++ b/libc/bionic/pthread_internal.h
@@ -178,6 +178,10 @@
   bionic_tls* bionic_tls;
 
   int errno_value;
+
+  bionic_tcb* bionic_tcb;
+  char stack_mte_ringbuffer_vma_name_buffer[32];
+
   bool is_main() { return start_routine == nullptr; }
 };
 
@@ -209,6 +213,7 @@
 __LIBC_HIDDEN__ void __pthread_internal_remove(pthread_internal_t* thread);
 __LIBC_HIDDEN__ void __pthread_internal_remove_and_free(pthread_internal_t* thread);
 __LIBC_HIDDEN__ void __find_main_stack_limits(uintptr_t* low, uintptr_t* high);
+__LIBC_HIDDEN__ void* __allocate_stack_mte_ringbuffer(size_t n, pthread_internal_t* thread);
 
 static inline __always_inline bionic_tcb* __get_bionic_tcb() {
   return reinterpret_cast<bionic_tcb*>(&__get_tls()[MIN_TLS_SLOT]);