justin/jsix
1
1
Fork 0
mirror of https://github.com/justinian/jsix.git synced 2025-12-11 08:54:31 -08:00
Code Issues Packages Projects Releases Wiki Activity

[kernel] Store object ids instead of full koids

Browse Source 
In preparation for futexes, I wanted to make kobjects a bit lighter.
Storing 32 bits of object id, and 8 bits of type (and not ending the
class in a ushort for handle count, which meant all kobjects were likely
to have a bunch of pad bytes), the kobject class data is now just one 8
byte word.

Also from this, change logs that mention threads or processes from
printing the full koid to just 2 bytes of object id from both process
and thread, which makes following the logs much easier.
This commit is contained in:
Justin C. Miller
2022-10-20 22:41:16 -07:00
parent 6583744532
commit 372bc1d2e6
5 changed files with 44 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
src/kernel/objects/kobject.h
View File

@@ -23,24 +23,31 @@ public:
max
};
/// The koid's most significant bits represent the object's type
static constexpr unsigned koid_type_bits = 4;
static constexpr unsigned koid_type_mask = (1 << koid_type_bits) - 1;
static constexpr unsigned koid_type_shift = (8 * sizeof(j6_koid_t)) - koid_type_bits;
kobject(type t);
virtual ~kobject();
/// Generate a new koid for a given type
/// \arg t The object type
/// \returns A new unique koid
static j6_koid_t koid_generate(type t);
/// Get the kobject type from a given koid
/// \arg koid An existing koid
/// \returns The object type for the koid
static type koid_type(j6_koid_t koid);
inline static type koid_type(j6_koid_t koid) {
return static_cast<type>((koid >> koid_type_shift) & koid_type_mask);
}
/// Get this object's type
inline type get_type() const { return koid_type(m_koid); }
inline type get_type() const { return m_type; }
/// Get this object's koid
inline j6_koid_t koid() const { return m_koid; }
inline j6_koid_t koid() const {
return (static_cast<j6_koid_t>(m_type) << koid_type_shift) | m_obj_id;
}
/// Get this object's type-relative object id
inline uint32_t obj_id() const { return m_obj_id; }
/// Increment the handle refcount
inline void handle_retain() { ++m_handle_count; }
@@ -63,8 +70,9 @@ private:
kobject(const kobject &other) = delete;
kobject(const kobject &&other) = delete;
j6_koid_t m_koid;
uint16_t m_handle_count;
type m_type;
uint32_t m_obj_id;
};
} // namespace obj