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parser: Add the ability to turn off jobs to ease with debugging

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The parser currently uses a fork model to do job processing. For
consistency even when the number of jobs is set to 1 a single
work process is forked. However this makes using gdb more difficult
and can be even worse for other debugging tools.

Make -j 0 disable all job spawning so all processing happens in the
main process.

PR: https://gitlab.com/apparmor/apparmor/merge_requests/105

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Steve Beattie <steve@nxnw.org>
This commit is contained in:
John Johansen 2018-04-22 00:32:47 -07:00 committed by Steve Beattie
parent 06d9a8eff0
commit 48a32b78b1
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GPG Key ID: 2F099E8D005E81F4
2 changed files with 8 additions and 6 deletions
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1
parser/apparmor_parser.pod
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@ -304,6 +304,7 @@ Use --help=dump to see a full list of which dump flags are supported
Set the number of jobs used to compile the specified policy. Where n can
be
0 - disable jobs and use the main process for all compilation
# - a specific number of jobs
auto - the # of cpus in the in the system
x# - # * number of cpus

13
parser/parser_main.c
View File

@ -82,10 +82,10 @@ int debug_cache = 0;
/* for jobs_max and jobs
* LONG_MAX : no limit
* 0 : auto = detect system processing cores
* LONG_MIN : auto = detect system processing cores
* n : use that number of processes/threads to compile policy
*/
#define JOBS_AUTO 0
#define JOBS_AUTO LONG_MIN
long jobs_max = -8; /* 8 * cpus */
long jobs = JOBS_AUTO; /* default: number of processor cores */
long njobs = 0;
@ -597,6 +597,8 @@ static int process_arg(int c, char *optarg)
break;
case 'j':
jobs = process_jobs_arg("-j", optarg);
if (jobs == 0)
jobs_max = 0;
break;
case 136:
jobs_max = process_jobs_arg("max-jobs", optarg);
@ -1017,12 +1019,11 @@ do { \
#define work_spawn(WORK, RESULT) \
do { \
/* what to do to avoid fork() overhead when single threaded \
if (jobs == 1) { \
// no parallel work so avoid fork() overhead \
if (jobs == 0) { \
/* no parallel work so avoid fork() overhead */ \
RESULT(WORK); \
break; \
}*/ \
} \
if (jobs_scale) { \
long n = sysconf(_SC_NPROCESSORS_ONLN); \
if (n > jobs_max) \