From: Waldemar Kozaczuk <jwkozac...@gmail.com>
Committer: Waldemar Kozaczuk <jwkozac...@gmail.com>
Branch: master
lazy stack: activate lazy stack in pthreads
This patch adds new mmap flag - mmap_stack - that is used when mmaping
a stack when creating new pthread. This new flag is only used when
the build parameter CONF_lazy_stack is enabled.
Signed-off-by: Waldemar Kozaczuk <jwkozac...@gmail.com>
---
diff --git a/include/osv/mmu-defs.hh b/include/osv/mmu-defs.hh
--- a/include/osv/mmu-defs.hh
+++ b/include/osv/mmu-defs.hh
@@ -84,6 +84,7 @@ enum {
mmap_small = 1ul << 5,
mmap_jvm_balloon = 1ul << 6,
mmap_file = 1ul << 7,
+ mmap_stack = 1ul << 8,
};
enum {
diff --git a/libc/mman.cc b/libc/mman.cc
--- a/libc/mman.cc
+++ b/libc/mman.cc
@@ -43,12 +43,7 @@ unsigned libc_flags_to_mmap(int flags)
mmap_flags |= mmu::mmap_populate;
}
if (flags & MAP_STACK) {
- // OSv currently requires that stacks be pinned (see issue #143). So
- // if an application wants to mmap() a stack for pthread_attr_setstack
- // and did us the courtesy of telling this to ue (via MAP_STACK),
- // let's return the courtesy by returning pre-faulted memory.
- // FIXME: If issue #143 is fixed, this workaround should be removed.
- mmap_flags |= mmu::mmap_populate;
+ mmap_flags |= mmu::mmap_stack;
}
if (flags & MAP_SHARED) {
mmap_flags |= mmu::mmap_shared;
diff --git a/libc/pthread.cc b/libc/pthread.cc
--- a/libc/pthread.cc
+++ b/libc/pthread.cc
@@ -141,7 +141,12 @@ namespace pthread_private {
return {attr.stack_begin, attr.stack_size};
}
size_t size = attr.stack_size;
- void *addr = mmu::map_anon(nullptr, size, mmu::mmap_populate,
mmu::perm_rw);
+#if CONF_lazy_stack
+ unsigned stack_flags = mmu::mmap_stack;
+#else
+ unsigned stack_flags = mmu::mmap_populate;
+#endif
+ void *addr = mmu::map_anon(nullptr, size, stack_flags, mmu::perm_rw);
mmu::mprotect(addr, attr.guard_size, 0);
sched::thread::stack_info si{addr, size};
si.deleter = free_stack;
--
You received this message because you are subscribed to the Google Groups "OSv
Development" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to osv-dev+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/osv-dev/000000000000b777eb05eb296b2f%40google.com.
