Expose hypervisor, logical processor, partition, and virtual processor
statistics via debugfs. These are provided by mapping 'stats' pages via
hypercall.
Patch #1: Update hv_call_map_stats_page() to return success when
HV_STATS_AREA_PARENT is unavailable, which is the case on some
hypervisor versions, where it can fall back to HV_STATS_AREA_SELF
Patch #2: Use struct hv_stats_page pointers instead of void *
Patch #3: Make mshv_vp_stats_map/unmap() more flexible to use with debugfs code
Patch #4: Always map vp stats page regardless of scheduler, to reuse in debugfs
Patch #5: Introduce the definitions needed for the various stats pages
Patch #6: Add mshv_debugfs.c, and integrate it with the mshv_root driver to
expose the partition and VP stats.
---
Changes in v3:
- Add 3 small refactor/cleanup patches (patches 2,3,4) from Stanislav. These
simplify some of the debugfs code, and fix issues with mapping VP stats on
L1VH.
- Fix cleanup of parent stats dentries on module removal (via squashing some
internal patches into patch #6) [Praveen]
- Remove unused goto label [Stanislav, kernel bot]
- Use struct hv_stats_page * instead of void * in mshv_debugfs.c [Stanislav]
- Remove some redundant variables [Stanislav]
- Rename debugfs dentry fields for brevity [Stanislav]
- Use ERR_CAST() for the dentry error pointer returned from
lp_debugfs_stats_create() [Stanislav]
- Fix leak of pages allocated for lp stats mappings by storing them in an array
[Michael]
- Add comments to clarify PARENT vs SELF usage and edge cases [Michael]
- Add VpLoadAvg for x86 and print the stat [Michael]
- Add NUM_STATS_AREAS for array sizing in mshv_debugfs.c [Michael]
Changes in v2:
- Remove unnecessary pr_debug_once() in patch 1 [Stanislav Kinsburskii]
- CONFIG_X86 -> CONFIG_X86_64 in patch 2 [Stanislav Kinsburskii]
---
Nuno Das Neves (2):
mshv: Add definitions for stats pages
mshv: Add debugfs to view hypervisor statistics
Purna Pavan Chandra Aekkaladevi (1):
mshv: Ignore second stats page map result failure
Stanislav Kinsburskii (3):
mshv: Use typed hv_stats_page pointers
mshv: Improve mshv_vp_stats_map/unmap(), add them to mshv_root.h
mshv: Always map child vp stats pages regardless of scheduler type
drivers/hv/Makefile | 1 +
drivers/hv/mshv_debugfs.c | 1103 ++++++++++++++++++++++++++++++++
drivers/hv/mshv_root.h | 49 +-
drivers/hv/mshv_root_hv_call.c | 64 +-
drivers/hv/mshv_root_main.c | 130 ++--
include/hyperv/hvhdk.h | 437 +++++++++++++
6 files changed, 1721 insertions(+), 63 deletions(-)
create mode 100644 drivers/hv/mshv_debugfs.c
--
2.34.1
