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gspawn: Add sysprof trace support for spawning

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Use this to replace the much-hated `g_debug()` which told people that
`posix_spawn()` (the fast path) wasn’t being used for various reasons.

If people want to make their process spawning faster now, they’ll have
to use a profiling tool like sysprof to check their program’s
performance. Shocking.

I think I was wrong to put this `g_debug()` in there in the first place
— it hasn’t served its purpose of making people speed up their spawn
paths to use `posix_spawn()`, it’s only cluttered up logs and frustrated
people.

Signed-off-by: Philip Withnall <withnall@endlessm.com>
This commit is contained in:
Philip Withnall 2020-06-25 22:27:10 +01:00
parent 6f281ce2e5
commit 7cd67c935f
1 changed files with 13 additions and 7 deletions
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20
glib/gspawn.c
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@ -54,6 +54,7 @@
#include "gspawn.h"
#include "gspawn-private.h"
#include "gthread.h"
#include "gtrace-private.h"
#include "glib/gstdio.h"
#include "genviron.h"
@ -1760,7 +1761,10 @@ fork_exec_with_fds (gboolean intermediate_child,
if (!intermediate_child && working_directory == NULL && !close_descriptors &&
!search_path_from_envp && child_setup == NULL)
{
g_debug ("Launching with posix_spawn");
g_trace_mark (G_TRACE_CURRENT_TIME, 0,
"GLib", "posix_spawn",
"%s", argv[0]);
status = do_posix_spawn (argv,
envp,
search_path,
@ -1796,12 +1800,14 @@ fork_exec_with_fds (gboolean intermediate_child,
}
else
{
g_debug ("posix_spawn avoided %s%s%s%s%s",
!intermediate_child ? "" : "(automatic reaping requested) ",
working_directory == NULL ? "" : "(workdir specified) ",
!close_descriptors ? "" : "(fd close requested) ",
!search_path_from_envp ? "" : "(using envp for search path) ",
child_setup == NULL ? "" : "(child_setup specified) ");
g_trace_mark (G_TRACE_CURRENT_TIME, 0,
"GLib", "fork",
"posix_spawn avoided %s%s%s%s%s",
!intermediate_child ? "" : "(automatic reaping requested) ",
working_directory == NULL ? "" : "(workdir specified) ",
!close_descriptors ? "" : "(fd close requested) ",
!search_path_from_envp ? "" : "(using envp for search path) ",
child_setup == NULL ? "" : "(child_setup specified) ");
}
#endif /* POSIX_SPAWN_AVAILABLE */