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minix/servers/vm/mem_anon_contig.c

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VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
/* This file implements the methods of physically contiguous anonymous memory. */
#include <assert.h>
#include "proto.h"
#include "vm.h"
#include "region.h"
#include "glo.h"
vm: new secondary cache code Primary purpose of change: to support the mmap implementation, VM must know both (a) about some block metadata for FS cache blocks, i.e. inode numbers and inode offsets where applicable; and (b) know about *all* cache blocks, i.e. also of the FS primary caches and not just the blocks that spill into the secondary one. This changes the interface and VM data structures. This change is only for the interface (libminixfs) and VM data structures; the filesystem code is unmodified, so although the secondary cache will be used as normal, blocks will not be annotated with inode information until the FS is modified to provide this information. Until it is modified, mmap of files will fail gracefully on such filesystems. This is indicated to VFS/VM by returning ENOSYS for REQ_PEEK. Change-Id: I1d2df6c485e6c5e89eb28d9055076cc02629594e
2013-03-20 20:18:52 +01:00
static int anon_contig_reference(struct phys_region *, struct phys_region *);
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
static int anon_contig_unreference(struct phys_region *pr);
static int anon_contig_pagefault(struct vmproc *vmp, struct vir_region *region,
Implement getrusage Implement getrusage. These fields of struct rusage are not supported and always set to zero at this time long ru_nswap; /* swaps */ long ru_inblock; /* block input operations */ long ru_oublock; /* block output operations */ long ru_msgsnd; /* messages sent */ long ru_msgrcv; /* messages received */ long ru_nvcsw; /* voluntary context switches */ long ru_nivcsw; /* involuntary context switches */ test75.c is the unit test for this new function Change-Id: I3f1eb69de1fce90d087d76773b09021fc6106539
2013-06-25 14:41:01 +02:00
struct phys_region *ph, int write, vfs_callback_t cb, void *state,
int len, int *io);
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
static int anon_contig_sanitycheck(struct phys_region *pr, char *file, int line);
static int anon_contig_writable(struct phys_region *pr);
static int anon_contig_resize(struct vmproc *vmp, struct vir_region *vr, vir_bytes l);
static int anon_contig_new(struct vir_region *vr);
struct mem_type mem_type_anon_contig = {
.name = "anonymous memory (physically contiguous)",
.ev_new = anon_contig_new,
.ev_reference = anon_contig_reference,
.ev_unreference = anon_contig_unreference,
.ev_pagefault = anon_contig_pagefault,
.ev_resize = anon_contig_resize,
.ev_sanitycheck = anon_contig_sanitycheck,
.writable = anon_contig_writable
};
static int anon_contig_pagefault(struct vmproc *vmp, struct vir_region *region,
Implement getrusage Implement getrusage. These fields of struct rusage are not supported and always set to zero at this time long ru_nswap; /* swaps */ long ru_inblock; /* block input operations */ long ru_oublock; /* block output operations */ long ru_msgsnd; /* messages sent */ long ru_msgrcv; /* messages received */ long ru_nvcsw; /* voluntary context switches */ long ru_nivcsw; /* involuntary context switches */ test75.c is the unit test for this new function Change-Id: I3f1eb69de1fce90d087d76773b09021fc6106539
2013-06-25 14:41:01 +02:00
struct phys_region *ph, int write, vfs_callback_t cb, void *state,
int len, int *io)
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
{
panic("anon_contig_pagefault: pagefault cannot happen");
}
static int anon_contig_new(struct vir_region *region)
{
u32_t allocflags;
phys_bytes new_pages, new_page_cl, cur_ph;
vm: make WARNS=5 proof Change-Id: I737ded223daf04f1c0c85a2e8e6b36c8fdcd07db
2013-08-20 14:02:33 +02:00
phys_bytes p, pages;
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
allocflags = vrallocflags(region->flags);
pages = region->length/VM_PAGE_SIZE;
assert(physregions(region) == 0);
for(p = 0; p < pages; p++) {
struct phys_block *pb = pb_new(MAP_NONE);
struct phys_region *pr = NULL;
if(pb)
vm: new secondary cache code Primary purpose of change: to support the mmap implementation, VM must know both (a) about some block metadata for FS cache blocks, i.e. inode numbers and inode offsets where applicable; and (b) know about *all* cache blocks, i.e. also of the FS primary caches and not just the blocks that spill into the secondary one. This changes the interface and VM data structures. This change is only for the interface (libminixfs) and VM data structures; the filesystem code is unmodified, so although the secondary cache will be used as normal, blocks will not be annotated with inode information until the FS is modified to provide this information. Until it is modified, mmap of files will fail gracefully on such filesystems. This is indicated to VFS/VM by returning ENOSYS for REQ_PEEK. Change-Id: I1d2df6c485e6c5e89eb28d9055076cc02629594e
2013-03-20 20:18:52 +01:00
pr = pb_reference(pb, p * VM_PAGE_SIZE, region, &mem_type_anon_contig);
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
if(!pr) {
if(pb) pb_free(pb);
map_free(region);
return ENOMEM;
}
}
assert(physregions(region) == pages);
if((new_page_cl = alloc_mem(pages, allocflags)) == NO_MEM) {
map_free(region);
return ENOMEM;
}
cur_ph = new_pages = CLICK2ABS(new_page_cl);
for(p = 0; p < pages; p++) {
vm: replace phys avl by array . make vm be able to use malloc() by overriding brk() and minix_mmap() functions . phys regions can then be malloc()ed and free()d instead of being in an avl tree, which is slightly faster . 'offset' field in phys_region can go too (offset is implied by position in array) but leads to bigger code changes
2012-12-17 19:26:52 +01:00
struct phys_region *pr = physblock_get(region, p * VM_PAGE_SIZE);
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
assert(pr);
assert(pr->ph);
assert(pr->ph->phys == MAP_NONE);
assert(pr->offset == p * VM_PAGE_SIZE);
pr->ph->phys = cur_ph + pr->offset;
}
return OK;
}
static int anon_contig_resize(struct vmproc *vmp, struct vir_region *vr, vir_bytes l)
{
printf("VM: cannot resize physically contiguous memory.\n");
return ENOMEM;
}
vm: new secondary cache code Primary purpose of change: to support the mmap implementation, VM must know both (a) about some block metadata for FS cache blocks, i.e. inode numbers and inode offsets where applicable; and (b) know about *all* cache blocks, i.e. also of the FS primary caches and not just the blocks that spill into the secondary one. This changes the interface and VM data structures. This change is only for the interface (libminixfs) and VM data structures; the filesystem code is unmodified, so although the secondary cache will be used as normal, blocks will not be annotated with inode information until the FS is modified to provide this information. Until it is modified, mmap of files will fail gracefully on such filesystems. This is indicated to VFS/VM by returning ENOSYS for REQ_PEEK. Change-Id: I1d2df6c485e6c5e89eb28d9055076cc02629594e
2013-03-20 20:18:52 +01:00
static int anon_contig_reference(struct phys_region *pr,
struct phys_region *newpr)
VM: make mapping types explicit Introduce explicit abstractions for different mapping types, handling the instantiation, forking, pagefaults and freeing of anonymous memory, direct physical mappings, shared memory and physically contiguous anonymous memory as separate types, making region.c more generic. Also some other genericification like merging the 3 munmap cases into one. COW and SMAP safemap code is still implicit in region.c.
2012-10-11 15:15:49 +02:00
{
printf("VM: cannot fork with physically contig memory.\n");
return ENOMEM;
}
/* Methods inherited from the anonymous memory methods. */
static int anon_contig_unreference(struct phys_region *pr)
{
return mem_type_anon.ev_unreference(pr);
}
static int anon_contig_sanitycheck(struct phys_region *pr, char *file, int line)
{
return mem_type_anon.ev_sanitycheck(pr, file, line);
}
static int anon_contig_writable(struct phys_region *pr)
{
return mem_type_anon.writable(pr);
}
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