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zfs/config/kernel-elevator-change.m4

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Modify vdev_elevator_switch() to use elevator_change() As of Linux 2.6.36 an elevator_change() interface was added. This commit updates vdev_elevator_switch() to use this interface when available, otherwise it falls back to the usermodehelper method. Original-patch-by: foobarz <sysop@xeon.(none)> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #906
2012-08-26 20:38:06 +00:00
dnl #
Linux 4.14 compat: blk_queue_stackable() The blk_queue_stackable() function was replaced in the 4.14 kernel by queue_is_rq_based(), commit torvalds/linux@5fdee212. This change resulted in the default elevator being used which can negatively impact performance. Rather than adding additional compatibility code to detect the new interface unconditionally attempt to set the elevator. Since we expect this to fail for block devices without an elevator the error message has been moved in to zfs_dbgmsg(). Finally, it was observed that the elevator_change() was removed from the 4.12 kernel, commit torvalds/linux@c033269. Update the comment to clearly specify which are expected to export the elevator_change() symbol. Reviewed-by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #7645
2018-06-20 04:52:45 +00:00
dnl # 2.6.36 API, exported elevator_change() symbol
dnl # 4.12 API, removed elevator_change() symbol
Modify vdev_elevator_switch() to use elevator_change() As of Linux 2.6.36 an elevator_change() interface was added. This commit updates vdev_elevator_switch() to use this interface when available, otherwise it falls back to the usermodehelper method. Original-patch-by: foobarz <sysop@xeon.(none)> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #906
2012-08-26 20:38:06 +00:00
dnl #
Perform KABI checks in parallel Reduce the time required for ./configure to perform the needed KABI checks by allowing kbuild to compile multiple test cases in parallel. This was accomplished by splitting each test's source code from the logic handling whether that code could be compiled or not. By introducing this split it's possible to minimize the number of times kbuild needs to be invoked. As importantly, it means all of the tests can be built in parallel. This does require a little extra care since we expect some tests to fail, so the --keep-going (-k) option must be provided otherwise some tests may not get compiled. Furthermore, since a failure during the kbuild modpost phase will result in an early exit; the final linking phase is limited to tests which passed the initial compilation and produced an object file. Once everything has been built the configure script proceeds as previously. The only significant difference is that it now merely needs to test for the existence of a .ko file to determine the result of a given test. This vastly speeds up the entire process. New test cases should use ZFS_LINUX_TEST_SRC to declare their test source code and ZFS_LINUX_TEST_RESULT to check the result. All of the existing kernel-*.m4 files have been updated accordingly, see config/kernel-current-time.m4 for a basic example. The legacy ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases but it's use is not encouraged. master (secs) patched (secs) ------------- ---------------- autogen.sh 61 68 configure 137 24 (~17% of current run time) make -j $(nproc) 44 44 make rpms 287 150 Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #8547 Closes #9132 Closes #9341
2019-10-01 19:50:34 +00:00
AC_DEFUN([ZFS_AC_KERNEL_SRC_ELEVATOR_CHANGE], [
ZFS_LINUX_TEST_SRC([elevator_change], [
Modify vdev_elevator_switch() to use elevator_change() As of Linux 2.6.36 an elevator_change() interface was added. This commit updates vdev_elevator_switch() to use this interface when available, otherwise it falls back to the usermodehelper method. Original-patch-by: foobarz <sysop@xeon.(none)> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #906
2012-08-26 20:38:06 +00:00
#include <linux/blkdev.h>
#include <linux/elevator.h>
],[
struct request_queue *q = NULL;
char *elevator = NULL;
Perform KABI checks in parallel Reduce the time required for ./configure to perform the needed KABI checks by allowing kbuild to compile multiple test cases in parallel. This was accomplished by splitting each test's source code from the logic handling whether that code could be compiled or not. By introducing this split it's possible to minimize the number of times kbuild needs to be invoked. As importantly, it means all of the tests can be built in parallel. This does require a little extra care since we expect some tests to fail, so the --keep-going (-k) option must be provided otherwise some tests may not get compiled. Furthermore, since a failure during the kbuild modpost phase will result in an early exit; the final linking phase is limited to tests which passed the initial compilation and produced an object file. Once everything has been built the configure script proceeds as previously. The only significant difference is that it now merely needs to test for the existence of a .ko file to determine the result of a given test. This vastly speeds up the entire process. New test cases should use ZFS_LINUX_TEST_SRC to declare their test source code and ZFS_LINUX_TEST_RESULT to check the result. All of the existing kernel-*.m4 files have been updated accordingly, see config/kernel-current-time.m4 for a basic example. The legacy ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases but it's use is not encouraged. master (secs) patched (secs) ------------- ---------------- autogen.sh 61 68 configure 137 24 (~17% of current run time) make -j $(nproc) 44 44 make rpms 287 150 Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #8547 Closes #9132 Closes #9341
2019-10-01 19:50:34 +00:00
int error __attribute__ ((unused)) =
elevator_change(q, elevator);
])
])
AC_DEFUN([ZFS_AC_KERNEL_ELEVATOR_CHANGE], [
AC_MSG_CHECKING([whether elevator_change() is available])
ZFS_LINUX_TEST_RESULT([elevator_change], [
Modify vdev_elevator_switch() to use elevator_change() As of Linux 2.6.36 an elevator_change() interface was added. This commit updates vdev_elevator_switch() to use this interface when available, otherwise it falls back to the usermodehelper method. Original-patch-by: foobarz <sysop@xeon.(none)> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #906
2012-08-26 20:38:06 +00:00
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ELEVATOR_CHANGE, 1,
Perform KABI checks in parallel Reduce the time required for ./configure to perform the needed KABI checks by allowing kbuild to compile multiple test cases in parallel. This was accomplished by splitting each test's source code from the logic handling whether that code could be compiled or not. By introducing this split it's possible to minimize the number of times kbuild needs to be invoked. As importantly, it means all of the tests can be built in parallel. This does require a little extra care since we expect some tests to fail, so the --keep-going (-k) option must be provided otherwise some tests may not get compiled. Furthermore, since a failure during the kbuild modpost phase will result in an early exit; the final linking phase is limited to tests which passed the initial compilation and produced an object file. Once everything has been built the configure script proceeds as previously. The only significant difference is that it now merely needs to test for the existence of a .ko file to determine the result of a given test. This vastly speeds up the entire process. New test cases should use ZFS_LINUX_TEST_SRC to declare their test source code and ZFS_LINUX_TEST_RESULT to check the result. All of the existing kernel-*.m4 files have been updated accordingly, see config/kernel-current-time.m4 for a basic example. The legacy ZFS_LINUX_TRY_COMPILE macro has been kept to handle special cases but it's use is not encouraged. master (secs) patched (secs) ------------- ---------------- autogen.sh 61 68 configure 137 24 (~17% of current run time) make -j $(nproc) 44 44 make rpms 287 150 Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #8547 Closes #9132 Closes #9341
2019-10-01 19:50:34 +00:00
[elevator_change() is available])
Modify vdev_elevator_switch() to use elevator_change() As of Linux 2.6.36 an elevator_change() interface was added. This commit updates vdev_elevator_switch() to use this interface when available, otherwise it falls back to the usermodehelper method. Original-patch-by: foobarz <sysop@xeon.(none)> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #906
2012-08-26 20:38:06 +00:00
],[
AC_MSG_RESULT(no)
])
])