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ircd:🆑 Sample tsc for work item submission for blocking interface mitigations.

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This commit is contained in:
Jason Volk 2021-10-15 14:57:31 -07:00
parent b4fb093876
commit e6a71efe8c
2 changed files with 39 additions and 0 deletions
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1
include/ircd/cl.h
View file

@ -58,6 +58,7 @@ struct ircd::cl::work
void *handle {nullptr};
ctx::ctx *context {ctx::current};
void *object {nullptr};
uint64_t ts {ircd::cycles()};
static void init(), fini() noexcept;

38
ircd/cl.cc
View file

@ -655,6 +655,7 @@ namespace ircd::cl
static const size_t _deps_list_max {32};
static thread_local cl_event _deps_list[_deps_list_max];
static void check_submit_blocking(cl::exec *const &, const exec::opts &);
static void handle_submitted(cl::exec *const &, const exec::opts &);
static vector_view<cl_event> make_deps_default(cl::work *const &, const exec::opts &);
static vector_view<cl_event> make_deps(cl::work *const &, const exec::opts &);
@ -1057,6 +1058,7 @@ try
assert(this->handle);
call(clReleaseEvent, cl_event(this->handle));
this->handle = nullptr;
this->work::ts = ircd::cycles();
}};
// Wait for the mapping to complete before presenting the buffer.
@ -1171,6 +1173,7 @@ try
assert(this->handle);
call(clReleaseEvent, cl_event(this->handle));
this->handle = nullptr;
this->work::ts = ircd::cycles();
}};
wait();
@ -1202,6 +1205,9 @@ ircd::cl::handle_submitted(cl::exec *const &exec,
if(opts.sync)
cl::sync();
if(likely(!opts.blocking))
check_submit_blocking(exec, opts);
if(opts.nice == 0)
ctx::yield();
@ -1209,6 +1215,38 @@ ircd::cl::handle_submitted(cl::exec *const &exec,
ctx::sleep(opts.nice * milliseconds(nice_rate));
}
void
ircd::cl::check_submit_blocking(cl::exec *const &exec,
const exec::opts &opts)
{
const auto threshold
{
268'435'456
};
const auto submit_cycles
{
prof::cycles() - exec->ts
};
if(likely(submit_cycles < threshold))
return;
char nbuf[64];
const auto name
{
exec->name(nbuf)
};
char pbuf[32];
log::dwarning
{
log, "clEnqueue() kernel '%s' blocking the host for %s cycles on submit.",
name?: "<unamed or data transfer kernel>"_sv,
pretty(pbuf, si(submit_cycles), 1),
};
}
ircd::vector_view<cl_event>
ircd::cl::make_deps(cl::work *const &work,
const exec::opts &opts)