From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org, Lukasz Majewski <lukma@denx.de>,
Carlos O'Donell <carlos@redhat.com>
Subject: [PATCH 07/18] linux: Remove supports_time64 () from clock_getres
Date: Thu, 17 Jun 2021 08:50:53 -0300 [thread overview]
Message-ID: <20210617115104.1359598-8-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20210617115104.1359598-1-adhemerval.zanella@linaro.org>
It breaks the usage case of live migration like CRIU or similar.
The performance drawback is it would require an extra syscall
on older kernels without 64-bit time support.
Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel
(with and without --enable-kernel=5.1) and on x86_64-linux-gnu.
---
sysdeps/unix/sysv/linux/clock_getres.c | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/clock_getres.c b/sysdeps/unix/sysv/linux/clock_getres.c
index a9edec93e6..83f0593074 100644
--- a/sysdeps/unix/sysv/linux/clock_getres.c
+++ b/sysdeps/unix/sysv/linux/clock_getres.c
@@ -21,7 +21,6 @@
#include <time.h>
#include <sysdep-vdso.h>
-#include <time64-support.h>
#include <shlib-compat.h>
#include <kernel-features.h>
@@ -34,19 +33,14 @@ __clock_getres64 (clockid_t clock_id, struct __timespec64 *res)
#ifndef __NR_clock_getres_time64
# define __NR_clock_getres_time64 __NR_clock_getres
#endif
- if (supports_time64 ())
- {
+
#ifdef HAVE_CLOCK_GETRES64_VSYSCALL
- r = INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res);
+ r = INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res);
#else
- r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
+ r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
#endif
-
- if (r == 0 || errno != ENOSYS)
- return r;
-
- mark_time64_unsupported ();
- }
+ if (r == 0 || errno != ENOSYS)
+ return r;
#ifndef __ASSUME_TIME64_SYSCALLS
/* Fallback code that uses 32-bit support. */
--
2.30.2
next prev parent reply other threads:[~2021-06-17 11:51 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 11:50 [PATCH 00/18] More y2038 fixes Adhemerval Zanella
2021-06-17 11:50 ` [PATCH 01/18] Use 64 bit time_t stat internally Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-22 19:37 ` Florian Weimer
2021-06-22 19:51 ` Adhemerval Zanella
2021-06-17 11:50 ` [PATCH 02/18] Use LFS and 64 bit time for installed programs Adhemerval Zanella
2021-06-17 12:19 ` Andreas Schwab
2021-06-18 18:50 ` Adhemerval Zanella
2021-06-17 20:49 ` Joseph Myers
2021-06-18 18:14 ` Adhemerval Zanella
2021-06-17 11:50 ` [PATCH 03/18] support: Add support_create_timer Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 04/18] linux: Only use 64-bit syscall if required for ppoll Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 05/18] linux: Only use 64-bit syscall if required for pselect Adhemerval Zanella
2021-06-21 7:42 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 06/18] linux: Only use 64-bit syscall if required for select Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` Adhemerval Zanella [this message]
2021-06-21 7:43 ` [PATCH 07/18] linux: Remove supports_time64 () from clock_getres Lukasz Majewski
2021-06-17 11:50 ` [PATCH 08/18] linux: Remove supports_time64 () from clock_gettime Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 09/18] linux: Remove time64-support Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 10/18] linux: timerfd_gettime minor cleanup Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 11/18] linux: Only use 64-bit syscall if required for semtimedop Adhemerval Zanella
2021-06-21 7:43 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 12/18] linux: Only use 64-bit syscall if required for timerfd_settime Adhemerval Zanella
2021-06-21 7:44 ` Lukasz Majewski
2021-06-17 11:50 ` [PATCH 13/18] linux: Only use 64-bit syscall if required for mq_timedreceive Adhemerval Zanella
2021-06-21 7:44 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 14/18] linux: Only use 64-bit syscall if required for mq_timedsend Adhemerval Zanella
2021-06-21 7:44 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 15/18] linux: Only use 64-bit syscall if required for sigtimedwait Adhemerval Zanella
2021-06-17 12:25 ` Andreas Schwab
2021-06-22 14:58 ` Adhemerval Zanella
2021-06-17 11:51 ` [PATCH 16/18] linux: Only use 64-bit syscall if required for utimensat family Adhemerval Zanella
2021-06-21 7:45 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 17/18] linux: Only use 64-bit syscall if required for internal futex Adhemerval Zanella
2021-06-21 7:45 ` Lukasz Majewski
2021-06-17 11:51 ` [PATCH 18/18] linux: Only use 64-bit syscall if required for clock_nanosleep Adhemerval Zanella
2021-06-17 15:11 ` Lukasz Majewski
2021-06-17 17:45 ` Adhemerval Zanella
2021-06-21 7:46 ` Lukasz Majewski
2021-06-17 14:20 ` [PATCH 00/18] More y2038 fixes Lukasz Majewski
2021-06-17 17:41 ` Adhemerval Zanella
2021-06-17 20:58 ` Joseph Myers
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