diff options
| author | Benjamin Berg <benjamin.berg@intel.com> | 2024-10-10 17:25:37 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2024-10-23 10:52:49 +0300 |
| commit | 0b8b2668f9981c1fefc2ef892bd915288ef01f33 (patch) | |
| tree | f6ab4464c0555dbf073d5e65d46a652da5ac9c6e /arch/um/include/shared | |
| parent | 9b0881858c74ae6a1a66de7350d123cf3f83169f (diff) | |
| download | linux-0b8b2668f9981c1fefc2ef892bd915288ef01f33.tar.xz | |
um: insert scheduler ticks when userspace does not yield
In time-travel mode userspace can do a lot of work without any time
passing. Unfortunately, this can result in OOM situations as the RCU
core code will never be run.
Work around this by keeping track of userspace processes that do not
yield for a lot of operations. When this happens, insert a jiffie into
the sched_clock clock to account time against the process and cause the
bookkeeping to run.
As sched_clock is used for tracing, it is useful to keep it in sync
between the different VMs. As such, try to remove added ticks again when
the actual clock ticks.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://patch.msgid.link/20241010142537.1134685-1-benjamin@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'arch/um/include/shared')
| -rw-r--r-- | arch/um/include/shared/common-offsets.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/um/include/shared/common-offsets.h b/arch/um/include/shared/common-offsets.h index 579ed946a3a9..86537e20942a 100644 --- a/arch/um/include/shared/common-offsets.h +++ b/arch/um/include/shared/common-offsets.h @@ -28,4 +28,8 @@ DEFINE(UML_CONFIG_64BIT, CONFIG_64BIT); #ifdef CONFIG_UML_TIME_TRAVEL_SUPPORT DEFINE(UML_CONFIG_UML_TIME_TRAVEL_SUPPORT, CONFIG_UML_TIME_TRAVEL_SUPPORT); #endif - +#ifdef CONFIG_UML_MAX_USERSPACE_ITERATIONS +DEFINE(UML_CONFIG_UML_MAX_USERSPACE_ITERATIONS, CONFIG_UML_MAX_USERSPACE_ITERATIONS); +#else +DEFINE(UML_CONFIG_UML_MAX_USERSPACE_ITERATIONS, 0); +#endif |