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Reintroduce IO accounting on zvols on Linux 3.19+

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zfsonlinux/zfs@e20cd6f7a8 caused us to
lose IO accounting on zvols. When I originally wrote that last year, the
symbols we needed to maintain IO accounting were GPL exported, but
torvalds/linux@394ffa503b provided
suitable symbols for restoring this functionality 4 months later.  We
can call them to restore the IO accounting on Linux 3.19 and later as
well as any older kernels where that patch is backported.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3741
This commit is contained in:
Richard Yao
2015-09-07 12:03:19 -04:00
committed by Brian Behlendorf
parent 1e17e910ea
commit 8198d18ca7
4 changed files with 45 additions and 5 deletions
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config/kernel-generic_io_acct.m4
+26
View File
@@ -0,0 +1,26 @@
dnl #
dnl # 3.19 API addition
dnl #
dnl # torvalds/linux@394ffa503bc40e32d7f54a9b817264e81ce131b4 allows us to
dnl # increment iostat counters without generic_make_request().
dnl #
AC_DEFUN([ZFS_AC_KERNEL_GENERIC_IO_ACCT], [
AC_MSG_CHECKING([whether generic IO accounting symbols are avaliable])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/bio.h>
void (*generic_start_io_acct_f)(int, unsigned long,
struct hd_struct *) = &generic_start_io_acct;
void (*generic_end_io_acct_f)(int, struct hd_struct *,
unsigned long) = &generic_end_io_acct;
], [
generic_start_io_acct(0, 0, NULL);
generic_end_io_acct(0, NULL, 0);
], [generic_start_io_acct], [block/bio.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_GENERIC_IO_ACCT, 1,
[generic_start_io_acct()/generic_end_io_acct() avaliable])
], [
AC_MSG_RESULT(no)
])
])
config/kernel.m4
+1
View File
@@ -94,6 +94,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
ZFS_AC_KERNEL_KMAP_ATOMIC_ARGS
ZFS_AC_KERNEL_FOLLOW_DOWN_ONE
ZFS_AC_KERNEL_MAKE_REQUEST_FN
ZFS_AC_KERNEL_GENERIC_IO_ACCT
AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"