From: Thomas Gleixner <tglx@linutronix.de> To: LKML <linux-kernel@vger.kernel.org> Cc: Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Helge Deller <deller@gmx.de>, John Stultz <john.stultz@linaro.org>, linux-m68k@vger.kernel.org, dhowells@redhat.com Subject: [patch 0/4] hrtimers: Handle remaining time correctly for CONFIG_TIME_LOW_RES=y Date: Thu, 14 Jan 2016 16:54:45 -0000 [thread overview] Message-ID: <20160114163744.582215466@linutronix.de> (raw) Helge reported, that timerfd returns occasionally remaining time larger than the relative time which was used to arm the timer. This is caused by the extra jiffy which we add in hrtimer_start_range_ns() if CONFIG_TIME_LOW_RES=y. This is not only an issue for timerfd. We have the same problem in posix-timers and itimers. This series adds infrastructure to the core to handle that cases and converts the users over to it. Thanks, tglx --- fs/timerfd.c | 2 - include/linux/hrtimer.h | 34 +++++++++++++++++++++++++-- kernel/time/hrtimer.c | 55 ++++++++++++++++++++++++++++++--------------- kernel/time/itimer.c | 2 - kernel/time/posix-timers.c | 2 - kernel/time/timer_list.c | 2 - 6 files changed, 72 insertions(+), 25 deletions(-)
WARNING: multiple messages have this Message-ID (diff)
From: Thomas Gleixner <tglx@linutronix.de> To: LKML <linux-kernel@vger.kernel.org> Cc: Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Helge Deller <deller@gmx.de>, John Stultz <john.stultz@linaro.org>, linux-m68k@lists.linux-m68k.org, dhowells@redhat.com Subject: [patch 0/4] hrtimers: Handle remaining time correctly for CONFIG_TIME_LOW_RES=y Date: Thu, 14 Jan 2016 16:54:45 -0000 [thread overview] Message-ID: <20160114163744.582215466@linutronix.de> (raw) Helge reported, that timerfd returns occasionally remaining time larger than the relative time which was used to arm the timer. This is caused by the extra jiffy which we add in hrtimer_start_range_ns() if CONFIG_TIME_LOW_RES=y. This is not only an issue for timerfd. We have the same problem in posix-timers and itimers. This series adds infrastructure to the core to handle that cases and converts the users over to it. Thanks, tglx --- fs/timerfd.c | 2 - include/linux/hrtimer.h | 34 +++++++++++++++++++++++++-- kernel/time/hrtimer.c | 55 ++++++++++++++++++++++++++++++--------------- kernel/time/itimer.c | 2 - kernel/time/posix-timers.c | 2 - kernel/time/timer_list.c | 2 - 6 files changed, 72 insertions(+), 25 deletions(-)
next reply other threads:[~2016-01-14 16:55 UTC|newest] Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-01-14 16:54 Thomas Gleixner [this message] 2016-01-14 16:54 ` [patch 0/4] hrtimers: Handle remaining time correctly for CONFIG_TIME_LOW_RES=y Thomas Gleixner 2016-01-14 16:54 ` [patch 1/4] hrtimer: Handle remaining time proper for TIME_LOW_RES Thomas Gleixner 2016-01-14 16:54 ` Thomas Gleixner 2016-01-16 18:36 ` Helge Deller 2016-01-16 18:36 ` Helge Deller 2016-01-16 18:36 ` Helge Deller 2016-01-17 10:42 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner 2016-01-14 16:54 ` [patch 2/4] timerfd: Handle relative timers with CONFIG_TIME_LOW_RES proper Thomas Gleixner 2016-01-17 10:43 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner 2016-01-14 16:54 ` [patch 2/4] " Thomas Gleixner 2016-01-14 16:54 ` [patch 3/4] posix-timers: " Thomas Gleixner 2016-01-14 16:54 ` Thomas Gleixner 2016-01-17 10:43 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner 2016-01-14 16:54 ` [patch 4/4] itimers: " Thomas Gleixner 2016-01-14 16:54 ` Thomas Gleixner 2016-01-17 10:43 ` [tip:timers/urgent] " tip-bot for Thomas Gleixner
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20160114163744.582215466@linutronix.de \ --to=tglx@linutronix.de \ --cc=deller@gmx.de \ --cc=dhowells@redhat.com \ --cc=john.stultz@linaro.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-m68k@vger.kernel.org \ --cc=mingo@kernel.org \ --cc=peterz@infradead.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.