diff options
Diffstat (limited to 'docs/devel')
| -rw-r--r-- | docs/devel/multi-thread-tcg.txt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/docs/devel/multi-thread-tcg.txt b/docs/devel/multi-thread-tcg.txt index faf09c6069..df83445ccf 100644 --- a/docs/devel/multi-thread-tcg.txt +++ b/docs/devel/multi-thread-tcg.txt @@ -131,8 +131,10 @@ DESIGN REQUIREMENT: Safely handle invalidation of TBs The direct jump themselves are updated atomically by the TCG tb_set_jmp_target() code. Modification to the linked lists that allow -searching for linked pages are done under the protect of the -tb_lock(). +searching for linked pages are done under the protection of tb->jmp_lock, +where tb is the destination block of a jump. Each origin block keeps a +pointer to its destinations so that the appropriate lock can be acquired before +iterating over a jump list. The global page table is a lockless radix tree; cmpxchg is used to atomically insert new elements. |