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ELF: Add cache pruning support.

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This patch causes us to use pruneCache() to prune the ThinLTO cache after
completing LTO. A new flag --thinlto-cache-policy allows users to configure
the policy.

Differential Revision: https://reviews.llvm.org/D31021

llvm-svn: 298036
This commit is contained in:
Peter Collingbourne 2017-03-17 02:24:16 +00:00
parent 8713bf69b6
commit ee59e43f92
5 changed files with 16 additions and 3 deletions
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2
lld/ELF/Config.h
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@ -13,6 +13,7 @@
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSet.h"
#include "llvm/Support/CachePruning.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/ELF.h"
@ -72,6 +73,7 @@ struct VersionDefinition {
struct Configuration {
InputFile *FirstElf = nullptr;
uint8_t OSABI = 0;
llvm::CachePruningPolicy ThinLTOCachePolicy;
llvm::StringMap<uint64_t> SectionStartMap;
llvm::StringRef DynamicLinker;
llvm::StringRef Entry;

3
lld/ELF/Driver.cpp
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@ -585,6 +585,9 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
Config->Target1Rel = getArg(Args, OPT_target1_rel, OPT_target1_abs, false);
Config->Target2 = getTarget2(Args);
Config->ThinLTOCacheDir = getString(Args, OPT_thinlto_cache_dir);
Config->ThinLTOCachePolicy =
check(parseCachePruningPolicy(getString(Args, OPT_thinlto_cache_policy)),
"--thinlto-cache-policy: invalid cache policy");
Config->ThinLTOJobs = getInteger(Args, OPT_thinlto_jobs, -1u);
Config->Threads = getArg(Args, OPT_threads, OPT_no_threads, true);
Config->Trace = Args.hasArg(OPT_trace);

3
lld/ELF/LTO.cpp
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@ -163,6 +163,9 @@ std::vector<InputFile *> BitcodeCompiler::compile() {
},
Cache));
if (!Config->ThinLTOCacheDir.empty())
pruneCache(Config->ThinLTOCacheDir, Config->ThinLTOCachePolicy);
for (unsigned I = 0; I != MaxTasks; ++I) {
if (Buff[I].empty())
continue;

2
lld/ELF/Options.td
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@ -394,4 +394,6 @@ def opt_remarks_with_hotness: Flag<["--"], "opt-remarks-with-hotness">,
def save_temps: F<"save-temps">;
def thinlto_cache_dir: J<"thinlto-cache-dir=">,
HelpText<"Path to ThinLTO cached object file directory">;
def thinlto_cache_policy: S<"thinlto-cache-policy">,
HelpText<"Pruning policy for the ThinLTO cache">;
def thinlto_jobs: J<"thinlto-jobs=">, HelpText<"Number of ThinLTO jobs">;

9
lld/test/ELF/lto/cache.ll
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@ -3,10 +3,13 @@
; RUN: opt -module-hash -module-summary %s -o %t.o
; RUN: opt -module-hash -module-summary %p/Inputs/cache.ll -o %t2.o
; RUN: rm -Rf %t.cache
; RUN: ld.lld --thinlto-cache-dir=%t.cache -o %t3 %t2.o %t.o
; RUN: rm -Rf %t.cache && mkdir %t.cache
; Create a file that will be removed by cache pruning due to age.
; RUN: touch -d 1970-01-01 %t.cache/foo
; RUN: ld.lld --thinlto-cache-dir=%t.cache --thinlto-cache-policy prune_after=1h -o %t3 %t2.o %t.o
; RUN: ls %t.cache | count 2
; Two cached objects, plus a timestamp file, minus the file we removed.
; RUN: ls %t.cache | count 3
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"