[lld] r340374 - [Support][CachePruning] prune least recently accessed files first

[Bob Haarman via llvm-commits]

Author: inglorion
Date: Tue Aug 21 17:52:16 2018
New Revision: 340374

URL: http://llvm.org/viewvc/llvm-project?rev=340374&view=rev
Log:
[Support][CachePruning] prune least recently accessed files first

Summary:
Before this change, pruning order was based on size. This changes it
to be based on time of last use instead, preferring to keep recently
used files and prune older ones.

Reviewers: pcc, rnk, espindola

Reviewed By: rnk

Subscribers: emaste, arichardson, hiraditya, steven_wu, dexonsmith, llvm-commits

Differential Revision: https://reviews.llvm.org/D51062

Modified:
    lld/trunk/test/ELF/lto/cache.ll

Modified: lld/trunk/test/ELF/lto/cache.ll
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/lto/cache.ll?rev=340374&r1=340373&r2=340374&view=diff
==============================================================================
--- lld/trunk/test/ELF/lto/cache.ll (original)
+++ lld/trunk/test/ELF/lto/cache.ll Tue Aug 21 17:52:16 2018
@@ -31,6 +31,20 @@
 ; RUN: ld.lld --thinlto-cache-dir=%t.cache --thinlto-cache-policy prune_after=0s:cache_size=0%:cache_size_files=1:prune_interval=0s -o %t3 %t2.o %t.o
 ; RUN: ls %t.cache | count 3
 
+; Check that we remove the least recently used file first.
+; RUN: rm -fr %t.cache
+; RUN: mkdir %t.cache
+; RUN: echo xyz > %t.cache/llvmcache-old
+; RUN: touch -t 198002011200 %t.cache/llvmcache-old
+; RUN: echo xyz > %t.cache/llvmcache-newer
+; RUN: touch -t 198002021200 %t.cache/llvmcache-newer
+; RUN: ld.lld --thinlto-cache-dir=%t.cache --thinlto-cache-policy prune_after=0s:cache_size=0%:cache_size_files=3:prune_interval=0s -o %t3 %t2.o %t.o
+; RUN: ls %t.cache | FileCheck %s
+
+; CHECK-NOT: llvmcache-old
+; CHECK: llvmcache-newer
+; CHECK-NOT: llvmcache-old
+
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"