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Commit commit 5bbe3547aa3b ("mm: allow compaction of unevictable pages")
introduced a sysctl that allows userspace to enable scanning of locked
pages for compaction. This patch introduces a new test which fragments
main memory and attempts to allocate a number of huge pages to exercise
this compaction logic.
Tested on machines with up to 32 GB RAM. With the patch a much larger
number of huge pages can be allocated than on the kernel without the
patch.
Example output:
On a machine with 16 GB RAM:
sudo make run_tests vm
...
-----------------------
running compaction_test
-----------------------
No of huge pages allocated = 3834
[PASS]
...
Signed-off-by: Sri Jayaramappa <sjayaram@akamai.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-api@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric B Munson <emunson@akamai.com>
Reviewed-by: Eric B Munson <emunson@akamai.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
23 lines
378 B
Makefile
23 lines
378 B
Makefile
# Makefile for vm selftests
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CFLAGS = -Wall
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BINARIES = compaction_test
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BINARIES += hugepage-mmap
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BINARIES += hugepage-shm
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BINARIES += hugetlbfstest
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BINARIES += map_hugetlb
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BINARIES += thuge-gen
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BINARIES += transhuge-stress
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all: $(BINARIES)
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%: %.c
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$(CC) $(CFLAGS) -o $@ $^ -lrt
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TEST_PROGS := run_vmtests
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TEST_FILES := $(BINARIES)
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include ../lib.mk
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clean:
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$(RM) $(BINARIES)
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