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libap: use custom wait time for file locks

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If many invocations of mdevctl occur simultaneously (as can happen with
libvirt) then waiting for 5-60 seconds per lock retry is simply too long.
Anticipating this possibility, retry more frequently but also attempt
significantly more retries than before.

Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Marc Hartmayer <marc@linux.ibm.com>
Tested-by: Marc Hartmayer <marc@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
This commit is contained in:
Matthew Rosato
2024-04-11 14:36:34 -04:00
committed by Steffen Eiden
parent f5f806af06
commit 474c6adf8f
2 changed files with 27 additions and 3 deletions
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include/lib/ap.h
+3 -1
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@@ -21,7 +21,9 @@
#define AP_UDEV_FILE "/etc/udev/rules.d/41-ap.rules"
#define AP_LOCKFILE "/run/lock/s390apconfig.lock"
#define AP_LOCK_RETRIES 15
#define AP_LOCK_RETRIES 3000
#define AP_LOCK_DELAY_US 30000 /* wait at least 30ms between lock retries */
#define AP_LOCK_VARIANCE_US 3000 /* or as much as 33ms */
/* apmask and aqmask are each represented as 67 character strings with:
* '0x' leading characters