From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Jeff Hostetler via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Jeff Hostetler <git@jeffhostetler.com>,
Derrick Stolee <stolee@gmail.com>,
Matheus Tavares <matheus.bernardino@usp.br>,
Johannes Sixt <j6t@kdbg.org>,
Jeff Hostetler <jeffhost@microsoft.com>
Subject: Re: [PATCH v2 2/9] trace2: convert tr2tls_thread_ctx.thread_name from strbuf to flex array
Date: Wed, 29 Dec 2021 02:11:50 +0100 [thread overview]
Message-ID: <211229.86mtkkgql4.gmgdl@evledraar.gmail.com> (raw)
In-Reply-To: <ff8df1b148ec486f565a59cb8a227bfa2ef48313.1640720202.git.gitgitgadget@gmail.com>
On Tue, Dec 28 2021, Jeff Hostetler via GitGitGadget wrote:
> From: Jeff Hostetler <jeffhost@microsoft.com>
>
> Move the thread name to a flex array at the bottom of the Trace2
> thread local storage data and get rid of the strbuf.
>
> Let the flex array have the full computed value of the thread name
> without truncation.
>
> Change the PERF target to truncate the thread name so that the columns
> still line up.
This commit message really doesn't help in explaining what we're trying
to do here and why it's needed. I'm not saying it's not, but why not a
strbuf, why a flex array? The diff below also shows changes unrelated to
this.
I tried this local fixup on top of this series which works, so I wonder
if we're just trying to get rid of the strbuf to signal that this
shouldn't change why not just strbuf_detach() and keep a "const char
*thread_name"?
diff --git a/trace2/tr2_tls.c b/trace2/tr2_tls.c
index 28ea55863d1..35d49b27b2e 100644
--- a/trace2/tr2_tls.c
+++ b/trace2/tr2_tls.c
@@ -48,7 +48,7 @@ void tr2tls_start_process_clock(void)
struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name,
uint64_t us_thread_start)
{
- struct tr2tls_thread_ctx *ctx;
+ struct tr2tls_thread_ctx *ctx = xcalloc(1, sizeof(struct tr2tls_thread_ctx));
struct strbuf buf_name = STRBUF_INIT;
int thread_id = tr2tls_locked_increment(&tr2_next_thread_id);
@@ -56,8 +56,7 @@ struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name,
strbuf_addf(&buf_name, "th%02d:", thread_id);
strbuf_addstr(&buf_name, thread_name);
- FLEX_ALLOC_MEM(ctx, thread_name, buf_name.buf, buf_name.len);
- strbuf_release(&buf_name);
+ ctx->thread_name = strbuf_detach(&buf_name, NULL);
ctx->thread_id = thread_id;
@@ -188,6 +187,7 @@ void tr2tls_release(void)
while (ctx) {
struct tr2tls_thread_ctx *next = ctx->next_ctx;
+ free((char *)ctx->thread_name);
free(ctx->array_us_start);
free(ctx);
diff --git a/trace2/tr2_tls.h b/trace2/tr2_tls.h
index 503829bbd44..bc6c6f12e38 100644
--- a/trace2/tr2_tls.h
+++ b/trace2/tr2_tls.h
@@ -6,6 +6,7 @@
#include "trace2/tr2_tmr.h"
struct tr2tls_thread_ctx {
+ const char *thread_name;
struct tr2tls_thread_ctx *next_ctx;
uint64_t *array_us_start;
size_t alloc;
@@ -14,8 +15,6 @@ struct tr2tls_thread_ctx {
struct tr2_timer_block timers;
struct tr2_counter_block counters;
-
- char thread_name[FLEX_ARRAY];
};
/*
> [...]
> index 7da94aba522..ed99a234b95 100644
> --- a/trace2/tr2_tls.c
> +++ b/trace2/tr2_tls.c
> @@ -34,7 +34,18 @@ void tr2tls_start_process_clock(void)
> struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name,
> uint64_t us_thread_start)
> {
> - struct tr2tls_thread_ctx *ctx = xcalloc(1, sizeof(*ctx));
> + struct tr2tls_thread_ctx *ctx;
> + struct strbuf buf_name = STRBUF_INIT;
> + int thread_id = tr2tls_locked_increment(&tr2_next_thread_id);
Here's the looks-to-be-unrelated to this strbuf conversion code I
mentioned above.
> +
> + if (thread_id)
> + strbuf_addf(&buf_name, "th%02d:", thread_id);
> + strbuf_addstr(&buf_name, thread_name);
> +
> + FLEX_ALLOC_MEM(ctx, thread_name, buf_name.buf, buf_name.len);
> + strbuf_release(&buf_name);
> +
> + ctx->thread_id = thread_id;
>
> /*
> [...]
next prev parent reply other threads:[~2021-12-29 1:14 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-20 15:01 [PATCH 0/9] Trace2 stopwatch timers and global counters Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 1/9] trace2: use size_t alloc,nr_open_regions in tr2tls_thread_ctx Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 2/9] trace2: convert tr2tls_thread_ctx.thread_name from strbuf to char* Jeff Hostetler via GitGitGadget
2021-12-20 16:31 ` Ævar Arnfjörð Bjarmason
2021-12-20 19:07 ` Jeff Hostetler
2021-12-20 19:35 ` Ævar Arnfjörð Bjarmason
2021-12-22 16:32 ` Jeff Hostetler
2021-12-21 7:33 ` Junio C Hamano
2021-12-21 7:22 ` Junio C Hamano
2021-12-22 16:28 ` Jeff Hostetler
2021-12-22 19:57 ` Junio C Hamano
2021-12-20 15:01 ` [PATCH 3/9] trace2: defer free of TLS CTX until program exit Jeff Hostetler via GitGitGadget
2021-12-21 7:30 ` Junio C Hamano
2021-12-22 21:59 ` Jeff Hostetler
2021-12-22 22:56 ` Junio C Hamano
2021-12-22 23:04 ` Jeff Hostetler
2021-12-23 7:38 ` Johannes Sixt
2021-12-23 18:18 ` Junio C Hamano
2021-12-27 18:51 ` Jeff Hostetler
2021-12-20 15:01 ` [PATCH 4/9] trace2: add thread-name override to event target Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 5/9] trace2: add thread-name override to perf target Jeff Hostetler via GitGitGadget
2021-12-20 15:01 ` [PATCH 6/9] trace2: add timer events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-20 16:39 ` Ævar Arnfjörð Bjarmason
2021-12-20 19:44 ` Jeff Hostetler
2021-12-21 14:20 ` Derrick Stolee
2021-12-20 15:01 ` [PATCH 7/9] trace2: add stopwatch timers Jeff Hostetler via GitGitGadget
2021-12-20 16:42 ` Ævar Arnfjörð Bjarmason
2021-12-22 21:38 ` Jeff Hostetler
2021-12-21 14:45 ` Derrick Stolee
2021-12-22 21:57 ` Jeff Hostetler
2021-12-20 15:01 ` [PATCH 8/9] trace2: add counter events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-20 16:51 ` Ævar Arnfjörð Bjarmason
2021-12-22 22:56 ` Jeff Hostetler
2021-12-20 15:01 ` [PATCH 9/9] trace2: add global counters Jeff Hostetler via GitGitGadget
2021-12-20 17:14 ` Ævar Arnfjörð Bjarmason
2021-12-22 22:18 ` Jeff Hostetler
2021-12-21 14:51 ` [PATCH 0/9] Trace2 stopwatch timers and " Derrick Stolee
2021-12-21 23:27 ` Matheus Tavares
2021-12-28 19:36 ` [PATCH v2 " Jeff Hostetler via GitGitGadget
2021-12-28 19:36 ` [PATCH v2 1/9] trace2: use size_t alloc,nr_open_regions in tr2tls_thread_ctx Jeff Hostetler via GitGitGadget
2021-12-29 0:48 ` Ævar Arnfjörð Bjarmason
2021-12-28 19:36 ` [PATCH v2 2/9] trace2: convert tr2tls_thread_ctx.thread_name from strbuf to flex array Jeff Hostetler via GitGitGadget
2021-12-29 1:11 ` Ævar Arnfjörð Bjarmason [this message]
2021-12-29 16:46 ` Jeff Hostetler
2021-12-28 19:36 ` [PATCH v2 3/9] trace2: defer free of thread local storage until program exit Jeff Hostetler via GitGitGadget
2021-12-28 19:36 ` [PATCH v2 4/9] trace2: add thread-name override to event target Jeff Hostetler via GitGitGadget
2021-12-28 19:36 ` [PATCH v2 5/9] trace2: add thread-name override to perf target Jeff Hostetler via GitGitGadget
2021-12-29 1:48 ` Ævar Arnfjörð Bjarmason
2021-12-29 17:15 ` Jeff Hostetler
2021-12-28 19:36 ` [PATCH v2 6/9] trace2: add timer events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-28 19:36 ` [PATCH v2 7/9] trace2: add stopwatch timers Jeff Hostetler via GitGitGadget
2021-12-28 19:36 ` [PATCH v2 8/9] trace2: add counter events to perf and event target formats Jeff Hostetler via GitGitGadget
2021-12-28 19:36 ` [PATCH v2 9/9] trace2: add global counters Jeff Hostetler via GitGitGadget
2021-12-29 1:54 ` [PATCH v2 0/9] Trace2 stopwatch timers and " Ævar Arnfjörð Bjarmason
2021-12-30 16:42 ` Jeff Hostetler
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