CP-17268 integrate coverage profiling

COVERAGE.md

@@ -0,0 +1,45 @@
+
+# Coverage Analysis
+
+This project can be compiled for coverage analysis using [bisect_ppx]. By
+default, this is not done. To compile for coverage analysis, do:
+
+    make coverage
+    make 
+
+The `coverage` target adds the rules in `_tags.coverage` to the `_tags`
+file, which in turn causes all code to be compiled for coverage
+analysis. The `_tags.coverage` file could be tweaked to control which
+files get instrumented.
+
+## Support Files
+
+See [profiling/coverage.ml](./profiling/coverage.ml) for the run-time
+setup of coverage profiling. This code has no effect when not profiling
+during execution. Once [bixect_ppx] has better defaults we could get rid
+of it.
+
+## Execution and Logging
+
+During program execution, a binary writes coverage data to
+
+    /tmp/bisect-<binary>-*.out
+
+This can be overridden by setting the `BISECT_FILE` environment
+variable, which is otherwise set at startup using the code in
+`profiling/coverage.ml`;
+
+## Analysis
+
+See the [bisect_ppx] documentation for details but try from the
+top-level directory:
+
+    bisect-ppx-report -I _build -html coverage /tmp/bisect-*.out
+
+This creates an HTML document in [coverage/](./coverage].
+
+[bisect_ppx]:	https://github.com/aantron/bisect_ppx
+
+
+
+

Makefile

@@ -97,3 +97,20 @@ release:
 	grep -v 'warn-error' _oasis > _oasis.tmp
 	mv _oasis.tmp _oasis
 	oasis setup
+
+# make coverage - prepares for building with coverage analysis
+# make uncover  - reverses the setup from "make coverage"
+# make report   - create coverage/index.html 
+
+coverage: _tags _tags.coverage 
+	test ! -f _tags.orig && mv _tags _tags.orig || true
+	cat _tags.coverage _tags.orig > _tags
+
+uncover: _tags.orig
+	mv _tags.orig _tags
+
+report:
+	bisect-ppx-report -I _build -html coverage /tmp/bisect-xenops*out
+
+.PHONY: report coverage uncover
+

README.md

@@ -9,3 +9,10 @@ xenopsd manages VMs running
 
 and provides a simple RPC control interface to the layer above (typically xapi).
 
+## Coverage Profiling
+
+This code can be profiled for coverage. See [COVERAGE.md].
+
+
+[COVERAGE.md]:    ./COVERAGE.md
+

_oasis

@@ -23,14 +23,68 @@ Flag simulator
   Description:        Build server with simulator support
   Default:            true
 
+
+# Support files for profiling 
+Library profiling
+  CompiledObject:     best
+  Path:               profiling
+  Install:            false
+  Findlibname:        profiling
+  Modules:            Coverage
+  BuildDepends: 
+
 Library xenopsd
   CompiledObject:     best
   Path:               lib
   Findlibname:        xenopsd
   ByteOpt:            -warn-error +a
   NativeOpt:          -warn-error +a
-  Modules:            Suspend_image, Cancellable_subprocess, Bootloader, Ionice, Mac, Xenops_migrate, Xenops_hooks, Task_server, Xenops_task, Updates, Xenops_utils, Xenops_server, Xenopsd, Xenops_server_plugin, Xenops_server_skeleton, Scheduler, Path, Storage, Interface, Xenctrl_uuid, Xenstore, Version
-  BuildDepends:       threads, threads.posix, uuidm, xmlm, cohttp, uri, rpclib, rpclib.syntax, forkexec, fd-send-recv, xcp, xcp.xen, xcp.storage, sexplib, sexplib.syntax, xcp, uutf, xenstore, xenstore.unix, xenstore_transport, xenstore_transport.unix, oclock
+  Modules:            
+    Suspend_image,
+    Cancellable_subprocess,
+    Bootloader,
+    Ionice,
+    Mac,
+    Xenops_migrate,
+    Xenops_hooks,
+    Task_server,
+    Xenops_task,
+    Updates,
+    Xenops_utils,
+    Xenops_server,
+    Xenopsd,
+    Xenops_server_plugin,
+    Xenops_server_skeleton,
+    Scheduler,
+    Path,
+    Storage,
+    Interface,
+    Xenctrl_uuid,
+    Xenstore,
+    Version
+  BuildDepends:
+    threads,
+    threads.posix,
+    uuidm,
+    xmlm,
+    cohttp,
+    uri,
+    rpclib,
+    rpclib.syntax,
+    forkexec,
+    fd-send-recv,
+    xcp,
+    xcp.xen,
+    xcp.storage,
+    sexplib,
+    sexplib.syntax,
+    xcp,
+    uutf,
+    xenstore,
+    xenstore.unix,
+    xenstore_transport,
+    xenstore_transport.unix,
+    oclock
   CSources:	      sockopt_stubs.c
 
 Executable set_domain_uuid
@@ -40,7 +94,11 @@ Executable set_domain_uuid
   NativeOpt:          -warn-error +a-3
   MainIs:             set_domain_uuid.ml
   Install:            false
-  BuildDepends:       xenctrl, uuidm, cmdliner
+  BuildDepends:
+    xenctrl, 
+    uuidm, 
+    cmdliner,
+    profiling
 
 Executable suspend_image_viewer
   CompiledObject:     best
@@ -49,7 +107,10 @@ Executable suspend_image_viewer
   NativeOpt:          -warn-error +a-3
   MainIs:             suspend_image_viewer.ml
   Install:            false
-  BuildDepends:       xenopsd, cmdliner
+  BuildDepends:
+    xenopsd, 
+    cmdliner,
+    profiling
 
 Executable xenopsd_xc_main
   CompiledObject:     best
@@ -60,7 +121,23 @@ Executable xenopsd_xc_main
   Build$:             flag(xen)
   Custom:             true
   Install:            false
-  BuildDepends:       xenctrl, xenopsd, xenstore, xenstore.unix, xenstore_transport, xenstore_transport.unix, rpclib, forkexec, xcp, xcp.storage, xcp.memory, xcp.rrd, rrd, sexplib, xcp-inventory
+  BuildDepends:
+    xenctrl,
+    xenopsd,
+    xenstore,
+    xenstore.unix,
+    xenstore_transport,
+    xenstore_transport.unix,
+    rpclib,
+    forkexec,
+    xcp,
+    xcp.storage,
+    xcp.memory,
+    xcp.rrd,
+    rrd,
+    sexplib,
+    xcp-inventory,
+    profiling
   CSources:           fsync_stubs.c, xenctrlext_stubs.c
 
 Executable watch_test
@@ -70,7 +147,14 @@ Executable watch_test
   NativeOpt:          -warn-error +a-3
   MainIs:             watch_test.ml
   Install:            false
-  BuildDepends:       xenopsd, xenstore, xenstore.unix, xenstore_transport, xenstore_transport.unix, threads
+  BuildDepends:
+    xenopsd,
+    xenstore,
+    xenstore.unix,
+    xenstore_transport,
+    xenstore_transport.unix,
+    threads,
+    profiling
 
 Executable xenopsd_simulator
   CompiledObject:     best
@@ -81,7 +165,9 @@ Executable xenopsd_simulator
   Build$:             flag(simulator)
   Custom:             true
   Install:            false
-  BuildDepends:       xenopsd
+  BuildDepends:
+    xenopsd,
+    profiling
 
 Executable xenopsd_libvirt_main
   CompiledObject:     best
@@ -92,7 +178,15 @@ Executable xenopsd_libvirt_main
   Build$:             flag(libvirt)
   Custom:             true
   Install:            false
-  BuildDepends:       xenopsd, rpclib, forkexec, xcp, xcp.storage, sexplib, libvirt
+  BuildDepends:
+    xenopsd,
+    rpclib,
+    forkexec,
+    xcp,
+    xcp.storage,
+    sexplib,
+    libvirt,
+    profiling
 
 Executable xenopsd_xenlight_main
   CompiledObject:     best
@@ -103,6 +197,23 @@ Executable xenopsd_xenlight_main
   Build$:             flag(xenlight)
   Custom:             true
   Install:            false
-  BuildDepends:       xenlight, xentoollog, xenctrl, xenopsd, xenstore, xenstore.unix, xenstore_transport, xenstore_transport.unix, rpclib, forkexec, xcp, xcp.storage, xcp.memory, sexplib, xcp-inventory, optcomp
+  BuildDepends:
+    xenlight,
+    xentoollog,
+    xenctrl,
+    xenopsd,
+    xenstore,
+    xenstore.unix,
+    xenstore_transport,
+    xenstore_transport.unix,
+    rpclib,
+    forkexec,
+    xcp,
+    xcp.storage,
+    xcp.memory,
+    sexplib,
+    xcp-inventory,
+    optcomp,
+    profiling
   CSources:           fsync_stubs.c, poll_stubs.c