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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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bd67d5c15c
Commit commit 5bbe3547aa ("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>
106 lines
2.0 KiB
Bash
Executable File
106 lines
2.0 KiB
Bash
Executable File
#!/bin/bash
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#please run as root
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#we need 256M, below is the size in kB
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needmem=262144
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mnt=./huge
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exitcode=0
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#get pagesize and freepages from /proc/meminfo
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while read name size unit; do
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if [ "$name" = "HugePages_Free:" ]; then
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freepgs=$size
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fi
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if [ "$name" = "Hugepagesize:" ]; then
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pgsize=$size
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fi
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done < /proc/meminfo
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#set proper nr_hugepages
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if [ -n "$freepgs" ] && [ -n "$pgsize" ]; then
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nr_hugepgs=`cat /proc/sys/vm/nr_hugepages`
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needpgs=`expr $needmem / $pgsize`
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if [ $freepgs -lt $needpgs ]; then
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lackpgs=$(( $needpgs - $freepgs ))
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echo $(( $lackpgs + $nr_hugepgs )) > /proc/sys/vm/nr_hugepages
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if [ $? -ne 0 ]; then
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echo "Please run this test as root"
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exit 1
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fi
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fi
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else
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echo "no hugetlbfs support in kernel?"
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exit 1
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fi
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mkdir $mnt
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mount -t hugetlbfs none $mnt
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echo "--------------------"
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echo "running hugepage-mmap"
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echo "--------------------"
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./hugepage-mmap
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if [ $? -ne 0 ]; then
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echo "[FAIL]"
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exitcode=1
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else
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echo "[PASS]"
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fi
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shmmax=`cat /proc/sys/kernel/shmmax`
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shmall=`cat /proc/sys/kernel/shmall`
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echo 268435456 > /proc/sys/kernel/shmmax
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echo 4194304 > /proc/sys/kernel/shmall
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echo "--------------------"
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echo "running hugepage-shm"
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echo "--------------------"
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./hugepage-shm
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if [ $? -ne 0 ]; then
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echo "[FAIL]"
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exitcode=1
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else
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echo "[PASS]"
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fi
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echo $shmmax > /proc/sys/kernel/shmmax
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echo $shmall > /proc/sys/kernel/shmall
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echo "--------------------"
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echo "running map_hugetlb"
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echo "--------------------"
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./map_hugetlb
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if [ $? -ne 0 ]; then
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echo "[FAIL]"
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exitcode=1
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else
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echo "[PASS]"
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fi
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echo "--------------------"
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echo "running hugetlbfstest"
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echo "--------------------"
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./hugetlbfstest
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if [ $? -ne 0 ]; then
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echo "[FAIL]"
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exitcode=1
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else
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echo "[PASS]"
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fi
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#cleanup
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umount $mnt
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rm -rf $mnt
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echo $nr_hugepgs > /proc/sys/vm/nr_hugepages
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echo "-----------------------"
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echo "running compaction_test"
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echo "-----------------------"
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./compaction_test
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if [ $? -ne 0 ]; then
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echo "[FAIL]"
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exitcode=1
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else
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echo "[PASS]"
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fi
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exit $exitcode
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