Archive-Team
/
zfs
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 103 Wiki Activity
zfs/config/kernel-bio-failfast.m4

57 lines
1.4 KiB
Plaintext
Raw Normal View History

Add FAILFAST support ZFS works best when it is notified as soon as possible when a device failure occurs. This allows it to immediately start any recovery actions which may be needed. In theory Linux supports a flag which can be set on bio's called FAILFAST which provides this quick notification by disabling the retry logic in the lower scsi layers. That's the theory at least. In practice is turns out that while the flag exists you oddly have to set it with the BIO_RW_AHEAD flag. And even when it's set it you may get retries in the low level drivers decides that's the right behavior, or if you don't get the right error codes reported to the scsi midlayer. Unfortunately, without additional kernels patchs there's not much which can be done to improve this. Basically, this just means that it may take 2-3 minutes before a ZFS is notified properly that a device has failed. This can be improved and I suspect I'll be submitting patches upstream to handle this.
2010-10-01 17:57:56 +00:00
dnl #
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-10 22:40:38 +00:00
dnl # Preferred interface for setting FAILFAST on a bio:
dnl # 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER}
Linux 2.6.36 compat, use REQ_FAILFAST_MASK and remove pre-2.6.36 support Commit f4af6bb783b0b7f2a6075cb1c74c225db8a157b2 which added support for REQ_FAILFAST_MASK but the new autoconf test didn't use the same preprocessor macro name as the code did. The effect is that FAILFAST mode has not been enabled for ZoL in any post-2.6.35 kernel. Retire the HAVE_BIO_RW_FAILFAST interface used in pre-2.6.28 kernels. Raise an error condition if the FAILFAST interface can't be detected. Signed-off-by: Tim Chase <tim@onlight.com Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3386
2015-05-08 20:49:56 +00:00
dnl # >= 2.6.36: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
Add FAILFAST support ZFS works best when it is notified as soon as possible when a device failure occurs. This allows it to immediately start any recovery actions which may be needed. In theory Linux supports a flag which can be set on bio's called FAILFAST which provides this quick notification by disabling the retry logic in the lower scsi layers. That's the theory at least. In practice is turns out that while the flag exists you oddly have to set it with the BIO_RW_AHEAD flag. And even when it's set it you may get retries in the low level drivers decides that's the right behavior, or if you don't get the right error codes reported to the scsi midlayer. Unfortunately, without additional kernels patchs there's not much which can be done to improve this. Basically, this just means that it may take 2-3 minutes before a ZFS is notified properly that a device has failed. This can be improved and I suspect I'll be submitting patches upstream to handle this.
2010-10-01 17:57:56 +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_BIO_FAILFAST_DTD], [
ZFS_LINUX_TEST_SRC([bio_failfast_dtd], [
Add FAILFAST support ZFS works best when it is notified as soon as possible when a device failure occurs. This allows it to immediately start any recovery actions which may be needed. In theory Linux supports a flag which can be set on bio's called FAILFAST which provides this quick notification by disabling the retry logic in the lower scsi layers. That's the theory at least. In practice is turns out that while the flag exists you oddly have to set it with the BIO_RW_AHEAD flag. And even when it's set it you may get retries in the low level drivers decides that's the right behavior, or if you don't get the right error codes reported to the scsi midlayer. Unfortunately, without additional kernels patchs there's not much which can be done to improve this. Basically, this just means that it may take 2-3 minutes before a ZFS is notified properly that a device has failed. This can be improved and I suspect I'll be submitting patches upstream to handle this.
2010-10-01 17:57:56 +00:00
#include <linux/bio.h>
],[
Fix gcc configure warnings Newer versions of gcc are getting smart enough to detect the sloppy syntax used for the autoconf tests. It is now generating warnings for unused/undeclared variables. Newer version of gcc even have the -Wunused-but-set-variable option set by default. This isn't a problem except when -Werror is set and they get promoted to an error. In this case the autoconf test will return an incorrect result which will result in a build failure latter on. To handle this I'm tightening up many of the autoconf tests to explicitly mark variables as unused to suppress the gcc warning. Remember, all of the autoconf code can never actually be run we just want to get a clean build error to detect which APIs are available. Never using a variable is absolutely fine for this. Closes #176
2011-04-19 17:02:21 +00:00
int flags __attribute__ ((unused));
Add FAILFAST support ZFS works best when it is notified as soon as possible when a device failure occurs. This allows it to immediately start any recovery actions which may be needed. In theory Linux supports a flag which can be set on bio's called FAILFAST which provides this quick notification by disabling the retry logic in the lower scsi layers. That's the theory at least. In practice is turns out that while the flag exists you oddly have to set it with the BIO_RW_AHEAD flag. And even when it's set it you may get retries in the low level drivers decides that's the right behavior, or if you don't get the right error codes reported to the scsi midlayer. Unfortunately, without additional kernels patchs there's not much which can be done to improve this. Basically, this just means that it may take 2-3 minutes before a ZFS is notified properly that a device has failed. This can be improved and I suspect I'll be submitting patches upstream to handle this.
2010-10-01 17:57:56 +00:00
flags = ((1 << BIO_RW_FAILFAST_DEV) |
(1 << BIO_RW_FAILFAST_TRANSPORT) |
(1 << BIO_RW_FAILFAST_DRIVER));
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_BIO_FAILFAST_DTD], [
AC_MSG_CHECKING([whether BIO_RW_FAILFAST_* are defined])
ZFS_LINUX_TEST_RESULT([bio_failfast_dtd], [
Add FAILFAST support ZFS works best when it is notified as soon as possible when a device failure occurs. This allows it to immediately start any recovery actions which may be needed. In theory Linux supports a flag which can be set on bio's called FAILFAST which provides this quick notification by disabling the retry logic in the lower scsi layers. That's the theory at least. In practice is turns out that while the flag exists you oddly have to set it with the BIO_RW_AHEAD flag. And even when it's set it you may get retries in the low level drivers decides that's the right behavior, or if you don't get the right error codes reported to the scsi midlayer. Unfortunately, without additional kernels patchs there's not much which can be done to improve this. Basically, this just means that it may take 2-3 minutes before a ZFS is notified properly that a device has failed. This can be improved and I suspect I'll be submitting patches upstream to handle this.
2010-10-01 17:57:56 +00:00
AC_MSG_RESULT(yes)
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-10 22:40:38 +00:00
AC_DEFINE(HAVE_BIO_RW_FAILFAST_DTD, 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
[BIO_RW_FAILFAST_* are defined])
Add FAILFAST support ZFS works best when it is notified as soon as possible when a device failure occurs. This allows it to immediately start any recovery actions which may be needed. In theory Linux supports a flag which can be set on bio's called FAILFAST which provides this quick notification by disabling the retry logic in the lower scsi layers. That's the theory at least. In practice is turns out that while the flag exists you oddly have to set it with the BIO_RW_AHEAD flag. And even when it's set it you may get retries in the low level drivers decides that's the right behavior, or if you don't get the right error codes reported to the scsi midlayer. Unfortunately, without additional kernels patchs there's not much which can be done to improve this. Basically, this just means that it may take 2-3 minutes before a ZFS is notified properly that a device has failed. This can be improved and I suspect I'll be submitting patches upstream to handle this.
2010-10-01 17:57:56 +00:00
],[
AC_MSG_RESULT(no)
])
])
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-10 22:40:38 +00:00
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_REQ_FAILFAST_MASK], [
ZFS_LINUX_TEST_SRC([bio_failfast_mask], [
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-10 22:40:38 +00:00
#include <linux/bio.h>
],[
Fix gcc configure warnings Newer versions of gcc are getting smart enough to detect the sloppy syntax used for the autoconf tests. It is now generating warnings for unused/undeclared variables. Newer version of gcc even have the -Wunused-but-set-variable option set by default. This isn't a problem except when -Werror is set and they get promoted to an error. In this case the autoconf test will return an incorrect result which will result in a build failure latter on. To handle this I'm tightening up many of the autoconf tests to explicitly mark variables as unused to suppress the gcc warning. Remember, all of the autoconf code can never actually be run we just want to get a clean build error to detect which APIs are available. Never using a variable is absolutely fine for this. Closes #176
2011-04-19 17:02:21 +00:00
int flags __attribute__ ((unused));
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-10 22:40:38 +00:00
flags = REQ_FAILFAST_MASK;
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_REQ_FAILFAST_MASK], [
AC_MSG_CHECKING([whether REQ_FAILFAST_MASK is defined])
ZFS_LINUX_TEST_RESULT([bio_failfast_mask], [
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-10 22:40:38 +00:00
AC_MSG_RESULT(yes)
Linux 2.6.36 compat, use REQ_FAILFAST_MASK and remove pre-2.6.36 support Commit f4af6bb783b0b7f2a6075cb1c74c225db8a157b2 which added support for REQ_FAILFAST_MASK but the new autoconf test didn't use the same preprocessor macro name as the code did. The effect is that FAILFAST mode has not been enabled for ZoL in any post-2.6.35 kernel. Retire the HAVE_BIO_RW_FAILFAST interface used in pre-2.6.28 kernels. Raise an error condition if the FAILFAST interface can't be detected. Signed-off-by: Tim Chase <tim@onlight.com Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3386
2015-05-08 20:49:56 +00:00
AC_DEFINE(HAVE_REQ_FAILFAST_MASK, 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
[REQ_FAILFAST_MASK is defined])
Linux 2.6.36 compat, use REQ_FAILFAST_MASK As of linux-2.6.36 the BIO_RW_FAILFAST and REQ_FAILFAST flags have been unified under the REQ_* names. These flags always had to be kept in-sync so this is a nice step forward, unfortunately it means we need to be careful to only use the new unified flags when the BIO_RW_* flags are not defined. Additional autoconf checks were added for this and if it is ever unclear which method to use no flags are set. This is safe but may result in longer delays before a disk is failed. Perferred interface for setting FAILFAST on a bio: 2.6.12-2.6.27: BIO_RW_FAILFAST 2.6.28-2.6.35: BIO_RW_FAILFAST_{DEV|TRANSPORT|DRIVER} 2.6.36-2.6.xx: REQ_FAILFAST_{DEV|TRANSPORT|DRIVER}
2010-11-10 22:40:38 +00:00
],[
AC_MSG_RESULT(no)
])
])
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_BIO_FAILFAST], [
ZFS_AC_KERNEL_SRC_BIO_FAILFAST_DTD
ZFS_AC_KERNEL_SRC_REQ_FAILFAST_MASK
])
AC_DEFUN([ZFS_AC_KERNEL_BIO_FAILFAST], [
ZFS_AC_KERNEL_BIO_FAILFAST_DTD
ZFS_AC_KERNEL_REQ_FAILFAST_MASK
])