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Determine GC type based on BUILT_KERNEL_VERSION_FILE.

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How it works:
1. build/make/core/Makefile generates a txt file with the kernel
   version, which is taken from an explicit BOARD_KERNEL_VERSION value,
   or extracted from the kernel image on the source tree, or extracted
   from the kernel image extracted from the prebuilt boot.img.
   The file is saved at
   $ANDROID_PRODUCT_OUT/obj/PACKAGING/check_vintf_all_intermediates/kernel_version.txt.
2. If PRODUCT_ENABLE_UFFD_GC is "default", meaning the GC type needs to
   be determined by the kernel version, build/make/core/Makefile copies
   kernel_version.txt to
   out/soong/dexpreopt/kernel_version_for_uffd_gc.txt.
3. build/soong/dexpreopt/config.go writes the the UFFD GC flag to
   out/soong/dexpreopt/uffd_gc_flag.txt. The flag is determined by an
   explicit PRODUCT_ENABLE_UFFD_GC value or by contruct_uffd_gc_flag.py,
   which reads kernel_version_for_uffd_gc.txt and determines the flag
   accordingly.
4. dex2oat takes the UFFD GC flag from uffd_gc_flag.txt.
5. post_process_props.py mangles ro.dalvik.vm.enable_uffd_gc based on
   the same logic.

Bug: 321751629
Bug: 319554951
Bug: 318763448
Bug: 319648491
Test: m --no-skip-soong-tests nothing
Test: atest uffd_gc_utils_test
Test: Build with `OVERRIDE_ENABLE_UFFD_GC=default m` for device with no
  UFFD support -
  1. Check the existence of `-Xgc:CMC` in
     out/soong/dexpreopt_arm64/dex_bootjars/android/system/framework/arm64/boot.invocation
     (dex2oat invocation for a boot image)
  2. Check the existence of `-Xgc:CMC` in
     out/soong/.intermediates/packages/apps/Settings/Settings/android_common/dexpreopt/Settings/oat/arm64/package.invocation
     (dex2oat invocation for an app defined in .bp)
  3. Check the existence of `-Xgc:CMC` in
     $ANDROID_PRODUCT_OUT/obj/APPS/Dialer_intermediates/oat/arm64/package.invocation
     (dex2oat invocation for an app defined in .mk)
  4. Check the value of ro.dalvik.vm.enable_uffd_gc in
     $ANDROID_PRODUCT_OUT/product/etc/build.prop
Test: Build with `OVERRIDE_ENABLE_UFFD_GC=default m` for device with
  UFFD support, and do the steps above.
Test: Build with `OVERRIDE_ENABLE_UFFD_GC=true m`, and do the steps
  above.
Test: Build with `OVERRIDE_ENABLE_UFFD_GC=false m`, and do the steps
  above.

Change-Id: I035ad32233e49e2a30ce11f6c7c318a648511ef8
This commit is contained in:
Jiakai Zhang
2024-01-18 17:27:42 +00:00
parent c21f548fd4
commit 7d292228c1
11 changed files with 350 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
dexpreopt/config.go
View File

@@ -98,7 +98,9 @@ type GlobalConfig struct {
// measure, as it masks real errors and affects performance.
RelaxUsesLibraryCheck bool
EnableUffdGc bool // preopt with the assumption that userfaultfd GC will be used on device.
// "true" to force preopt with CMC GC (a.k.a., UFFD GC); "false" to force preopt with CC GC;
// "default" to determine the GC type based on the kernel version file.
EnableUffdGc string
}
var allPlatformSystemServerJarsKey = android.NewOnceKey("allPlatformSystemServerJars")
@@ -154,6 +156,7 @@ type GlobalSoongConfig struct {
Zip2zip android.Path
ManifestCheck android.Path
ConstructContext android.Path
UffdGcFlag android.WritablePath
}
type ModuleConfig struct {
@@ -537,6 +540,7 @@ func createGlobalSoongConfig(ctx android.ModuleContext) *GlobalSoongConfig {
Zip2zip: ctx.Config().HostToolPath(ctx, "zip2zip"),
ManifestCheck: ctx.Config().HostToolPath(ctx, "manifest_check"),
ConstructContext: ctx.Config().HostToolPath(ctx, "construct_context"),
UffdGcFlag: getUffdGcFlagPath(ctx),
}
}
@@ -588,6 +592,7 @@ type globalJsonSoongConfig struct {
Zip2zip string
ManifestCheck string
ConstructContext string
UffdGcFlag string
}
// ParseGlobalSoongConfig parses the given data assumed to be read from the
@@ -609,6 +614,7 @@ func ParseGlobalSoongConfig(ctx android.PathContext, data []byte) (*GlobalSoongC
Zip2zip: constructPath(ctx, jc.Zip2zip),
ManifestCheck: constructPath(ctx, jc.ManifestCheck),
ConstructContext: constructPath(ctx, jc.ConstructContext),
UffdGcFlag: constructWritablePath(ctx, jc.UffdGcFlag),
}
return config, nil
@@ -633,12 +639,15 @@ func checkBootJarsConfigConsistency(ctx android.SingletonContext, dexpreoptConfi
}
func (s *globalSoongConfigSingleton) GenerateBuildActions(ctx android.SingletonContext) {
checkBootJarsConfigConsistency(ctx, GetGlobalConfig(ctx), ctx.Config())
global := GetGlobalConfig(ctx)
checkBootJarsConfigConsistency(ctx, global, ctx.Config())
if GetGlobalConfig(ctx).DisablePreopt {
if global.DisablePreopt {
return
}
buildUffdGcFlag(ctx, global)
config := GetCachedGlobalSoongConfig(ctx)
if config == nil {
// No module has enabled dexpreopting, so we assume there will be no calls
@@ -654,6 +663,7 @@ func (s *globalSoongConfigSingleton) GenerateBuildActions(ctx android.SingletonC
Zip2zip: config.Zip2zip.String(),
ManifestCheck: config.ManifestCheck.String(),
ConstructContext: config.ConstructContext.String(),
UffdGcFlag: config.UffdGcFlag.String(),
}
data, err := json.Marshal(jc)
@@ -684,9 +694,32 @@ func (s *globalSoongConfigSingleton) MakeVars(ctx android.MakeVarsContext) {
config.Zip2zip.String(),
config.ManifestCheck.String(),
config.ConstructContext.String(),
config.UffdGcFlag.String(),
}, " "))
}
func buildUffdGcFlag(ctx android.BuilderContext, global *GlobalConfig) {
uffdGcFlag := getUffdGcFlagPath(ctx)
if global.EnableUffdGc == "true" {
android.WriteFileRuleVerbatim(ctx, uffdGcFlag, "--runtime-arg -Xgc:CMC")
} else if global.EnableUffdGc == "false" {
android.WriteFileRuleVerbatim(ctx, uffdGcFlag, "")
} else if global.EnableUffdGc == "default" {
// Generated by `build/make/core/Makefile`.
kernelVersionFile := android.PathForOutput(ctx, "dexpreopt/kernel_version_for_uffd_gc.txt")
// Determine the UFFD GC flag by the kernel version file.
rule := android.NewRuleBuilder(pctx, ctx)
rule.Command().
Tool(ctx.Config().HostToolPath(ctx, "construct_uffd_gc_flag")).
Input(kernelVersionFile).
Output(uffdGcFlag)
rule.Restat().Build("dexpreopt_uffd_gc_flag", "dexpreopt_uffd_gc_flag")
} else {
panic(fmt.Sprintf("Unknown value of PRODUCT_ENABLE_UFFD_GC: %s", global.EnableUffdGc))
}
}
func GlobalConfigForTests(ctx android.PathContext) *GlobalConfig {
return &GlobalConfig{
DisablePreopt: false,
@@ -731,7 +764,7 @@ func GlobalConfigForTests(ctx android.PathContext) *GlobalConfig {
}
}
func globalSoongConfigForTests() *GlobalSoongConfig {
func globalSoongConfigForTests(ctx android.BuilderContext) *GlobalSoongConfig {
return &GlobalSoongConfig{
Profman: android.PathForTesting("profman"),
Dex2oat: android.PathForTesting("dex2oat"),
@@ -740,5 +773,19 @@ func globalSoongConfigForTests() *GlobalSoongConfig {
Zip2zip: android.PathForTesting("zip2zip"),
ManifestCheck: android.PathForTesting("manifest_check"),
ConstructContext: android.PathForTesting("construct_context"),
UffdGcFlag: android.PathForOutput(ctx, "dexpreopt_test", "uffd_gc_flag.txt"),
}
}
func GetDexpreoptDirName(ctx android.PathContext) string {
prefix := "dexpreopt_"
targets := ctx.Config().Targets[android.Android]
if len(targets) > 0 {
return prefix + targets[0].Arch.ArchType.String()
}
return prefix + "unknown_target"
}
func getUffdGcFlagPath(ctx android.PathContext) android.WritablePath {
return android.PathForOutput(ctx, "dexpreopt/uffd_gc_flag.txt")
}