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Code Issues Releases Wiki Activity

ircd::ctx: Fix trivial branch sequence causing L2 => I1 miss; hot section.

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This commit is contained in:
Jason Volk 2019-10-09 19:01:45 -07:00
parent b3b526ccc2
commit 864afd78e4
2 changed files with 18 additions and 22 deletions
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13
include/ircd/ctx/dock.h
View file

@ -25,8 +25,6 @@ class ircd::ctx::dock
list q;
void notify(ctx &) noexcept;
public:
bool empty() const noexcept;
size_t size() const noexcept;
@ -161,3 +159,14 @@ ircd::ctx::dock::wait_until(time_point&& tp,
}
while(1);
}
/// Wake up the next context waiting on the dock
inline void
ircd::ctx::dock::notify_one()
noexcept
{
if(q.empty())
return;
ircd::ctx::notify(*q.front());
}

27
ircd/ctx.cc
View file

@ -198,6 +198,7 @@ ircd::ctx::ctx::jump()
/// considered handled an another attempt to `wait()` can be made. Returns true
/// if the context suspended and was notified. When a context wakes up the
/// note counter is reset.
[[gnu::hot]]
bool
IRCD_CTX_STACK_PROTECT
ircd::ctx::ctx::wait()
@ -258,7 +259,6 @@ ircd::ctx::ctx::wait()
///
/// Returns true if this note was the first note received by this context
/// while it's been suspended or false if it's already been notified.
[[gnu::hot]]
bool
ircd::ctx::ctx::note()
noexcept
@ -411,6 +411,7 @@ ircd::ctx::for_each(const std::function<bool (ctx &)> &closure)
/// Yield to context `ctx`.
///
///
[[gnu::hot]]
void
ircd::ctx::yield(ctx &ctx)
{
@ -427,7 +428,7 @@ ircd::ctx::yield(ctx &ctx)
// things allowing for more direct jumps until all work is complete.
// !!! TODO !!!
notify(ctx);
ctx.note();
}
/// Notifies `ctx` to wake up from another std::thread
@ -733,6 +734,7 @@ ircd::ctx::this_ctx::wait_until(const system_point &tp,
}
/// Yield the currently running context until notified.
[[gnu::hot]]
void
ircd::ctx::this_ctx::wait()
{
@ -2754,16 +2756,7 @@ noexcept
return;
q.push_back(c);
notify(*c);
}
/// Wake up the next context waiting on the dock
void
ircd::ctx::dock::notify_one()
noexcept
{
if(!q.empty())
notify(*q.front());
ircd::ctx::notify(*c);
}
/// Wake up all contexts waiting on the dock.
@ -2777,10 +2770,11 @@ noexcept
{
q.for_each([this](ctx &c)
{
notify(c);
ircd::ctx::notify(c);
});
}
[[gnu::hot]]
void
ircd::ctx::dock::wait()
{
@ -2823,13 +2817,6 @@ ircd::ctx::dock::wait(const predicate &pred)
while(!pred());
}
void
ircd::ctx::dock::notify(ctx &ctx)
noexcept
{
ircd::ctx::notify(ctx);
}
/// The number of contexts waiting in the queue.
bool
ircd::ctx::dock::waiting(const ctx &a)