On Thu, 11 Sep 2014, Leon Romanovsky wrote:
> > Linux kernel memory is not page-able, but memory allocated through vmalloc
> > can still cause page fault. How device drivers using vmalloc handle this?
> Pages allocated via vmalloc call won't generate page-faults.
Kernel faults are used on some pl
On Thu, Sep 11, 2014 at 5:53 PM, Miles MH Chen wrote:
> Not exactly, vmalloc'ed addresses can generate page faults.
>
> vmalloc'ed page entries live in kernel master page table, not in
>
> every process' page table. When a vmalloc page fault occurs,
>
> kernel simply copy the page table entry from
Not exactly, vmalloc'ed addresses can generate page faults.
vmalloc'ed page entries live in kernel master page table, not in
every process' page table. When a vmalloc page fault occurs,
kernel simply copy the page table entry from master page table to
the current process' page table and fix the
On Wed, Sep 10, 2014 at 5:52 PM, Manavendra Nath Manav
wrote:
>
> On 10-Sep-2014 6:24 pm, wrote:
>>
>> On Wed, 10 Sep 2014 14:45:23 +0530, Manavendra Nath Manav said:
>>
>> > But if the total RAM is limited (less than 896MB LOWMEM), for example as
>> > in
>> > embedded devices how the kernel code
On 10-Sep-2014 6:24 pm, wrote:
>
> On Wed, 10 Sep 2014 14:45:23 +0530, Manavendra Nath Manav said:
>
> > But if the total RAM is limited (less than 896MB LOWMEM), for example
as in
> > embedded devices how the kernel code be kept in RAM all the time. Am I
> > correct to assume that the kernel pre-
On Wed, 10 Sep 2014 14:45:23 +0530, Manavendra Nath Manav said:
> But if the total RAM is limited (less than 896MB LOWMEM), for example as in
> embedded devices how the kernel code be kept in RAM all the time. Am I
> correct to assume that the kernel pre-fetches all pages when entering
> kernel mo
On 09-Sep-2014 10:25 pm, "Jeff Haran" wrote:
>
>
> While reading the book Essential Linux device drivers it says "user mode
code is allowed to page fault, however, whereas kernel mode code isn't".
>
> Why is it so? Why can't kernel mode code handle the page fault and reload
the page from swap? Als
in kernel code
While reading the book Essential Linux device drivers it says "user mode code
is allowed to page fault, however, whereas kernel mode code isn't".
Why is it so? Why can't kernel mode code handle the page fault and reload the
page from swap? Also, can page fau
On Tue, 09 Sep 2014 18:53:55 +0530, Manavendra Nath Manav said:
> Why is it so? Why can't kernel mode code handle the page fault and reload
> the page from swap? Also, can page fault occur when kernel is executing in
> process context and/or interrupt context?
There's no inherent chiseled-in-ston
On Tue, Sep 09, 2014 at 06:53:55PM +0530, Manavendra Nath Manav wrote:
> While reading the book Essential Linux device drivers it says "user mode code
> is allowed to page fault, however, whereas kernel mode code isn't".
>
> Why is it so? Why can't kernel mode code handle the page fault and reload
While reading the book Essential Linux device drivers it says "user mode
code is allowed to page fault, however, whereas kernel mode code isn't".
Why is it so? Why can't kernel mode code handle the page fault and reload
the page from swap? Also, can page fault occur when kernel is executing in
pro
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