Which timer is tick timer in Linux?
Which timer interrup trigger cfs?
When I run cat /proc/interrupts command, I just seeing local timer interrupt changes in timer peripherals?
Which timer is tick timer in linux in x86 architecture?
I actually wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses ttc (trimple timer counter) as tick timer in zynq series soc. But i couldn't understand which timer is used as tick timer in x86. While content of /sys/devices/system/clocksource/clocksource0/available_clocksources file is acpi_pm,hpet,tsc, content of current_clocksource is tsc. But there aren't any of these peripheral's interrupt in output of cat /proc/interrupts
linux linux-kernel x86-64 interrupt scheduling
asked Nov 26 '18 at 17:26
overlordoverlord
129213
|
show 6 more comments
Which timer interrup trigger cfs?
When I run cat /proc/interrupts command, I just seeing local timer interrupt changes in timer peripherals?
Which timer is tick timer in linux in x86 architecture?
I actually wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses ttc (trimple timer counter) as tick timer in zynq series soc. But i couldn't understand which timer is used as tick timer in x86. While content of /sys/devices/system/clocksource/clocksource0/available_clocksources file is acpi_pm,hpet,tsc, content of current_clocksource is tsc. But there aren't any of these peripheral's interrupt in output of cat /proc/interrupts
linux linux-kernel x86-64 interrupt scheduling
asked Nov 26 '18 at 17:26
overlordoverlord
129213
1
The kernel is free software, so you can study its source code, and is explained in many places. See kernelnewbies.org; BTW I would guess that most (and probaby all) external interrupts are triggering (or could trigger) a context switch. See also operating systems: three easy pieces
– Basile Starynkevitch
Nov 26 '18 at 17:35
Ok. I wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses trimple timer counter as tick timer in zynq series soc. But i culdn't understand which timer is used as tick timer in x86.
– overlord
Nov 26 '18 at 17:51
1
You'll better edit your question to improve it. In general, avoid commenting your own question
– Basile Starynkevitch
Nov 26 '18 at 17:58
TSC is the CPU timestamp counter, queried with therdtscinstruction -> some scaling when a timestamp is needed. It doesn't tick./proc/interruptsshould have an entry for local timer interrupts, though. At least that and probably most other interrupts will callschedule()after executing the top-half IRQ handler, to (I think) either run the bottom half or pick another task to execute.
– Peter Cordes
Nov 26 '18 at 20:24
1
@0andriy Nice to know, I weren't aware of the Reduced Hardware platform, thanks for sharing! though I don't consider smartphones part of x86 IBM PC, those of course have total different needs
– Margaret Bloom
Dec 2 '18 at 16:28
|
show 6 more comments
Which timer interrup trigger cfs?
When I run cat /proc/interrupts command, I just seeing local timer interrupt changes in timer peripherals?
Which timer is tick timer in linux in x86 architecture?
I actually wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses ttc (trimple timer counter) as tick timer in zynq series soc. But i couldn't understand which timer is used as tick timer in x86. While content of /sys/devices/system/clocksource/clocksource0/available_clocksources file is acpi_pm,hpet,tsc, content of current_clocksource is tsc. But there aren't any of these peripheral's interrupt in output of cat /proc/interrupts
linux linux-kernel x86-64 interrupt scheduling
asked Nov 26 '18 at 17:26
overlordoverlord
129213
Which timer interrup trigger cfs?
When I run cat /proc/interrupts command, I just seeing local timer interrupt changes in timer peripherals?
Which timer is tick timer in linux in x86 architecture?
I actually wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses ttc (trimple timer counter) as tick timer in zynq series soc. But i couldn't understand which timer is used as tick timer in x86. While content of /sys/devices/system/clocksource/clocksource0/available_clocksources file is acpi_pm,hpet,tsc, content of current_clocksource is tsc. But there aren't any of these peripheral's interrupt in output of cat /proc/interrupts
linux linux-kernel x86-64 interrupt scheduling
linux linux-kernel x86-64 interrupt scheduling
asked Nov 26 '18 at 17:26
overlordoverlord
129213
asked Nov 26 '18 at 17:26
overlordoverlord
129213
edited Nov 26 '18 at 21:45
overlord
asked Nov 26 '18 at 17:26
overlordoverlord
129213
asked Nov 26 '18 at 17:26
overlordoverlord
129213
asked Nov 26 '18 at 17:26
overlordoverlord
129213
129213
1
The kernel is free software, so you can study its source code, and is explained in many places. See kernelnewbies.org; BTW I would guess that most (and probaby all) external interrupts are triggering (or could trigger) a context switch. See also operating systems: three easy pieces
– Basile Starynkevitch
Nov 26 '18 at 17:35
Ok. I wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses trimple timer counter as tick timer in zynq series soc. But i culdn't understand which timer is used as tick timer in x86.
– overlord
Nov 26 '18 at 17:51
1
You'll better edit your question to improve it. In general, avoid commenting your own question
– Basile Starynkevitch
Nov 26 '18 at 17:58
TSC is the CPU timestamp counter, queried with therdtscinstruction -> some scaling when a timestamp is needed. It doesn't tick./proc/interruptsshould have an entry for local timer interrupts, though. At least that and probably most other interrupts will callschedule()after executing the top-half IRQ handler, to (I think) either run the bottom half or pick another task to execute.
– Peter Cordes
Nov 26 '18 at 20:24
1
@0andriy Nice to know, I weren't aware of the Reduced Hardware platform, thanks for sharing! though I don't consider smartphones part of x86 IBM PC, those of course have total different needs
– Margaret Bloom
Dec 2 '18 at 16:28
|
show 6 more comments
1
The kernel is free software, so you can study its source code, and is explained in many places. See kernelnewbies.org; BTW I would guess that most (and probaby all) external interrupts are triggering (or could trigger) a context switch. See also operating systems: three easy pieces
– Basile Starynkevitch
Nov 26 '18 at 17:35
Ok. I wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses trimple timer counter as tick timer in zynq series soc. But i culdn't understand which timer is used as tick timer in x86.
– overlord
Nov 26 '18 at 17:51
1
You'll better edit your question to improve it. In general, avoid commenting your own question
– Basile Starynkevitch
Nov 26 '18 at 17:58
TSC is the CPU timestamp counter, queried with therdtscinstruction -> some scaling when a timestamp is needed. It doesn't tick./proc/interruptsshould have an entry for local timer interrupts, though. At least that and probably most other interrupts will callschedule()after executing the top-half IRQ handler, to (I think) either run the bottom half or pick another task to execute.
– Peter Cordes
Nov 26 '18 at 20:24
1
@0andriy Nice to know, I weren't aware of the Reduced Hardware platform, thanks for sharing! though I don't consider smartphones part of x86 IBM PC, those of course have total different needs
– Margaret Bloom
Dec 2 '18 at 16:28
1
1
The kernel is free software, so you can study its source code, and is explained in many places. See kernelnewbies.org; BTW I would guess that most (and probaby all) external interrupts are triggering (or could trigger) a context switch. See also operating systems: three easy pieces
– Basile Starynkevitch
Nov 26 '18 at 17:35
The kernel is free software, so you can study its source code, and is explained in many places. See kernelnewbies.org; BTW I would guess that most (and probaby all) external interrupts are triggering (or could trigger) a context switch. See also operating systems: three easy pieces
– Basile Starynkevitch
Nov 26 '18 at 17:35
Ok. I wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses trimple timer counter as tick timer in zynq series soc. But i culdn't understand which timer is used as tick timer in x86.
– overlord
Nov 26 '18 at 17:51
Ok. I wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses trimple timer counter as tick timer in zynq series soc. But i culdn't understand which timer is used as tick timer in x86.
– overlord
Nov 26 '18 at 17:51
1
1
You'll better edit your question to improve it. In general, avoid commenting your own question
– Basile Starynkevitch
Nov 26 '18 at 17:58
You'll better edit your question to improve it. In general, avoid commenting your own question
– Basile Starynkevitch
Nov 26 '18 at 17:58
TSC is the CPU timestamp counter, queried with the
rdtsc instruction -> some scaling when a timestamp is needed. It doesn't tick. /proc/interrupts should have an entry for local timer interrupts, though. At least that and probably most other interrupts will call schedule() after executing the top-half IRQ handler, to (I think) either run the bottom half or pick another task to execute.– Peter Cordes
Nov 26 '18 at 20:24
TSC is the CPU timestamp counter, queried with the
rdtsc instruction -> some scaling when a timestamp is needed. It doesn't tick. /proc/interrupts should have an entry for local timer interrupts, though. At least that and probably most other interrupts will call schedule() after executing the top-half IRQ handler, to (I think) either run the bottom half or pick another task to execute.– Peter Cordes
Nov 26 '18 at 20:24
1
1
@0andriy Nice to know, I weren't aware of the Reduced Hardware platform, thanks for sharing! though I don't consider smartphones part of x86 IBM PC, those of course have total different needs
– Margaret Bloom
Dec 2 '18 at 16:28
@0andriy Nice to know, I weren't aware of the Reduced Hardware platform, thanks for sharing! though I don't consider smartphones part of x86 IBM PC, those of course have total different needs
– Margaret Bloom
Dec 2 '18 at 16:28
|
show 6 more comments
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The kernel is free software, so you can study its source code, and is explained in many places. See kernelnewbies.org; BTW I would guess that most (and probaby all) external interrupts are triggering (or could trigger) a context switch. See also operating systems: three easy pieces
– Basile Starynkevitch
Nov 26 '18 at 17:35
Ok. I wonder which timer is equavelent of system tick timer in cortex-m in x86? For example, linux uses trimple timer counter as tick timer in zynq series soc. But i culdn't understand which timer is used as tick timer in x86.
– overlord
Nov 26 '18 at 17:51
1
You'll better edit your question to improve it. In general, avoid commenting your own question
– Basile Starynkevitch
Nov 26 '18 at 17:58
TSC is the CPU timestamp counter, queried with the
rdtscinstruction -> some scaling when a timestamp is needed. It doesn't tick./proc/interruptsshould have an entry for local timer interrupts, though. At least that and probably most other interrupts will callschedule()after executing the top-half IRQ handler, to (I think) either run the bottom half or pick another task to execute.– Peter Cordes
Nov 26 '18 at 20:24
1
@0andriy Nice to know, I weren't aware of the Reduced Hardware platform, thanks for sharing! though I don't consider smartphones part of x86 IBM PC, those of course have total different needs
– Margaret Bloom
Dec 2 '18 at 16:28