[Tarantool-patches] [PATCH luajit][v1] sysprof: allow calling sysprof.report before stopping

[Sergey Bronnikov via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

It is not allowed to call a function `sysprof.report()` without
stopping profiler. However, sometimes it may be useful to analyze
numbers provided by the report without stopping the profiler. The
patch removes the appropriate condition and allows reporting
without stopping.

Resolves tarantool/tarantool#11229
---
Branch: https://github.com/tarantool/luajit/tree/ligurio/gh-11229-misc.sysprof.report
Issue: https://github.com/tarantool/tarantool/issues/11229

 src/lj_sysprof.c                               |  2 --
 .../profilers/misclib-sysprof-lapi.test.lua    | 18 ++++++++++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/src/lj_sysprof.c b/src/lj_sysprof.c
index 88c7a41b..cf6161a5 100644
--- a/src/lj_sysprof.c
+++ b/src/lj_sysprof.c
@@ -532,8 +532,6 @@ int lj_sysprof_stop(lua_State *L)
 int lj_sysprof_report(struct luam_Sysprof_Counters *counters)
 {
   const struct sysprof *sp = &sysprof;
-  if (sp->state != SPS_IDLE)
-    return PROFILE_ERRUSE;
   memcpy(counters, &sp->counters, sizeof(sp->counters));
   return PROFILE_SUCCESS;
 }
diff --git a/test/tarantool-tests/profilers/misclib-sysprof-lapi.test.lua b/test/tarantool-tests/profilers/misclib-sysprof-lapi.test.lua
index f316c390..3e774a53 100644
--- a/test/tarantool-tests/profilers/misclib-sysprof-lapi.test.lua
+++ b/test/tarantool-tests/profilers/misclib-sysprof-lapi.test.lua
@@ -10,7 +10,7 @@ local test = tap.test("misclib-sysprof-lapi"):skipcond({
   ["Disabled due to #10803"] = os.getenv("LUAJIT_TEST_USE_VALGRIND"),
 })
 
-test:plan(44)
+test:plan(48)
 
 jit.off()
 -- XXX: Run JIT tuning functions in a safe frame to avoid errors
@@ -166,13 +166,27 @@ test:is(err, nil, "no error with good interval 1")
 test:is(errno, nil, "no errno with good interval 1")
 misc.sysprof.stop()
 
+-- Intermediate sysprof.report().
+res, err, errno = misc.sysprof.start{
+    mode = "C",
+    interval = 1,
+    path = "/dev/null",
+}
+test:is(res, true, "res is correct")
+test:is(err, nil, "no error")
+test:is(errno, nil, "no errno")
+
+local report = misc.sysprof.report()
+test:ok(report.samples == 0, "total number of samples is non-zero")
+misc.sysprof.stop()
+
 -- DEFAULT MODE
 
 if not pcall(generate_output, { mode = "D", interval = 100 }) then
   test:fail('`default` mode with interval 100')
 end
 
-local report = misc.sysprof.report()
+report = misc.sysprof.report()
 
 -- Check the profile is not empty.
 test:ok(report.samples > 0,
-- 
2.43.0