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15 Commits

Author SHA1 Message Date
Andrew Boie
6c97ab3167 mmu: promote public APIs 
These are application facing and are prefixed with k_.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-23 19:47:23 -05:00
Andrew Boie
c7be5dddda mmu: backing stores reserve page fault room 
If we evict enough pages to completely fill the backing store,
through APIs like k_mem_map(), z_page_frame_evict(), or
z_mem_page_out(), this will produce a crash the next time we
try to handle a page fault.

The backing store now always reserves a free storage location
for actual page faults.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-23 19:47:23 -05:00
Andrew Boie
cad944e259 tests: demand_paging: add more API tests 
Add remaining APIs in mem_manage.h even though not all have
been promoted to public (yet).

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-23 19:47:23 -05:00
Andrew Boie
60d306642e kernel: add z_num_pagefaults_get() 
Simple counter of number of successfully handled page faults by
the core kernel.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-23 19:47:23 -05:00
Andrew Boie
ef65597b73 tests: add intial demand paging testcase 
More to be added, but for now show that we can map more
anonymous memory than we physically have, and that reading/
writing to it works as expected.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-23 19:47:23 -05:00
Anas Nashif
6e4b33e8a5 Revert "tests: add intial demand paging testcase" 
This reverts commit 060462d5c6.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2021-01-22 08:39:45 -05:00
Anas Nashif
c2c87c99c7 Revert "kernel: add z_num_pagefaults_get()" 
This reverts commit d7e6bc3e84.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2021-01-22 08:39:45 -05:00
Anas Nashif
fb4db2c0a8 Revert "tests: demand_paging: add more API tests" 
This reverts commit 7370895c0e.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2021-01-22 08:39:45 -05:00
Anas Nashif
5e978d237c Revert "mmu: backing stores reserve page fault room" 
This reverts commit 7a642f81ab.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2021-01-22 08:39:45 -05:00
Anas Nashif
ef17f889dc Revert "mmu: promote public APIs" 
This reverts commit 63fc93e21f.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
 2021-01-22 08:39:45 -05:00
Andrew Boie
63fc93e21f mmu: promote public APIs 
These are application facing and are prefixed with k_.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-21 16:47:00 -05:00
Andrew Boie
7a642f81ab mmu: backing stores reserve page fault room 
If we evict enough pages to completely fill the backing store,
through APIs like k_mem_map(), z_page_frame_evict(), or
z_mem_page_out(), this will produce a crash the next time we
try to handle a page fault.

The backing store now always reserves a free storage location
for actual page faults.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-21 16:47:00 -05:00
Andrew Boie
7370895c0e tests: demand_paging: add more API tests 
Add remaining APIs in mem_manage.h even though not all have
been promoted to public (yet).

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-21 16:47:00 -05:00
Andrew Boie
d7e6bc3e84 kernel: add z_num_pagefaults_get() 
Simple counter of number of successfully handled page faults by
the core kernel.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-21 16:47:00 -05:00
Andrew Boie
060462d5c6 tests: add intial demand paging testcase 
More to be added, but for now show that we can map more
anonymous memory than we physically have, and that reading/
writing to it works as expected.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
 2021-01-21 16:47:00 -05:00