[Tarantool-patches] [PATCH luajit 2/2] test: rewrite sysprof test using managed execution
Igor Munkin
imun at tarantool.org
Tue Dec 5 15:59:01 MSK 2023
Sergey,
On 05.12.23, Sergey Kaplun wrote:
> Hi, Igor!
> Thanks for the fixes!
> Please, consider my comments below.
>
<snipped>
>
> >
> > >
> > > > > +#define STREAM_BUFFER_SIZE (8 * 1024 * 1024)
> > > > > +#define DEVNULL -1
> > >
> > > `DEVNULL` name is misleading (like we've actually opened `/dev/null`).
> > > Maybe `DUMMY_FD` is better? Also, I suppose we can drop the `fd` field
> > > at all. We can just use static structure in this translation unit and
> > > compare pointer against it, so there is no need for an additional field
> > > fd in the structure itself.
> >
> > I see little reasoning in this suggestion: the approach with the
> > structure is quite straight-forward and copied from another sysprof test
> > implemented in C. Re naming: I prefer to leave it as is.
>
> I don't get why it is straight-forward. This approach with unused fields
> is just misleading. In
> <test/tarantool-c-tests/misclib-sysprof-capi.test.c> the `fd` field is
> used since the "/dev/null" is opened and data written to it.
>
> Also, since we can use custom writer, that test may be updated wo using
> `fd` too. But this should be done as a separate refactoring patch.
>
> >
> > In general, your nit is nice, but I believe it should be applied
> > for the patch moving <ptrace> tricks to utils library.
>
> I don't see any relations with ptrace here. It's just the usage of
> sysprof's C API.
Well, I've finally got your original idea. Here it is:
================================================================================
diff --git a/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c b/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
index 6bf7562f..8967abc4 100644
--- a/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
+++ b/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
@@ -53,35 +53,26 @@
extern void *lj_ff_tostring(void);
extern void *lj_fff_res1(void);
-/* Sysprof "/dev/null" stream helpers. {{{ */
+/* Sysprof dummy stream helpers. {{{ */
/*
* Yep, 8Mb. Tuned in order not to bother the platform with too
* often flushes.
*/
#define STREAM_BUFFER_SIZE (8 * 1024 * 1024)
-#define DEVNULL -1
-struct devnull_ctx {
- /*
- * XXX: Dummy file descriptor to be used as "/dev/null"
- * context indicator in writer and on_stop callback.
- */
- int fd;
+struct dummy_ctx {
/* Buffer for data recorded by sysprof. */
uint8_t buf[STREAM_BUFFER_SIZE];
};
+static struct dummy_ctx context;
+
static int stream_new(struct luam_Sysprof_Options *options)
{
- struct devnull_ctx *ctx = calloc(1, sizeof(struct devnull_ctx));
- if (ctx == NULL)
- return PROFILE_ERRIO;
-
- /* Set "/dev/null" context indicator. */
- ctx->fd = DEVNULL;
- options->ctx = ctx;
- options->buf = ctx->buf;
+ /* Set dummy context. */
+ options->ctx = &context;
+ options->buf = (uint8_t *)&context.buf;
options->len = STREAM_BUFFER_SIZE;
return PROFILE_SUCCESS;
@@ -89,21 +80,19 @@ static int stream_new(struct luam_Sysprof_Options *options)
static int stream_delete(void *rawctx, uint8_t *buf)
{
- struct devnull_ctx *ctx = rawctx;
- assert(ctx->fd == DEVNULL);
- free(ctx);
+ assert(rawctx == &context);
+ /* XXX: No need to release context memory. Just return. */
return PROFILE_SUCCESS;
}
static size_t stream_writer(const void **buf_addr, size_t len, void *rawctx)
{
- struct devnull_ctx *ctx = rawctx;
- assert(ctx->fd == DEVNULL);
+ assert(rawctx == &context);
/* Do nothing, just return back to the profiler. */
return STREAM_BUFFER_SIZE;
}
-/* }}} Sysprof "/dev/null" stream helpers. */
+/* }}} Sysprof dummy stream helpers. */
static int tracee(const char *luacode)
{
================================================================================
>
<snipped>
>
> > >
> > > Typo: s/<lj_fff_res1>/the <lj_fff_res1>/
> > >
> > > > > + * FIXME: Make this part test agnostic.
> > >
> > > Typo: s/test agnostic/test-agnostic/
> > >
> > > Nit: TODO looks more valid for me (since it's working).
> > > Feel free to ignore.
> >
> > Fixed.
> >
> > ================================================================================
> >
> > diff --git a/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c b/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
> > index 44421812..036f8141 100644
> > --- a/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
> > +++ b/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
> > @@ -153,8 +153,8 @@ static int tracee(const char *luacode)
> >
> > /*
> > * XXX: The only event to be streamed must be FFUNC at
> > - * <lj_fff_res1> instruction.
> > - * FIXME: Make this part test agnostic.
> > + * the <lj_fff_res1> instruction.
> > + * TODO: Make this part test agnostic.
>
> Typo: s/test agnostic/test-agnostic/
Fixed (again).
================================================================================
diff --git a/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c b/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
index 8967abc4..a1c4a3ed 100644
--- a/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
+++ b/test/tarantool-c-tests/gh-8594-sysprof-ffunc-crash.test.c
@@ -143,7 +143,7 @@ static int tracee(const char *luacode)
/*
* XXX: The only event to be streamed must be FFUNC at
* the <lj_fff_res1> instruction.
- * TODO: Make this part test agnostic.
+ * TODO: Make this part test-agnostic.
*/
assert(luaM_sysprof_report(&counters) == PROFILE_SUCCESS);
assert(counters.samples == 1);
================================================================================
>
<snipped>
> > > --
> > > Best regards,
> > > Sergey Kaplun
> >
> > --
> > Best regards,
> > IM
>
> --
> Best regards,
> Sergey Kaplun
--
Best regards,
IM
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