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authorRickard Green <[email protected]>2013-09-05 14:45:26 +0200
committerSverker Eriksson <[email protected]>2013-09-30 17:45:45 +0200
commitd04e3d43f3a96030db0c9b8da8f88cb78f8ec8dc (patch)
treec0ffc014b0897da6f11a5279bbb378fea7278199 /erts/emulator/sys/common/erl_mmap.c
parent5295a138518df6c9f4907a2fb9afb1282b96ffb7 (diff)
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erts: Improve erts_mmap out of free descriptor management
Diffstat (limited to 'erts/emulator/sys/common/erl_mmap.c')
-rw-r--r--erts/emulator/sys/common/erl_mmap.c100
1 files changed, 60 insertions, 40 deletions
diff --git a/erts/emulator/sys/common/erl_mmap.c b/erts/emulator/sys/common/erl_mmap.c
index 723efa772f..0ac08a0004 100644
--- a/erts/emulator/sys/common/erl_mmap.c
+++ b/erts/emulator/sys/common/erl_mmap.c
@@ -222,6 +222,7 @@ static struct {
mmap_state.size.os.used -= (SZ); \
} while (0)
+
static void
add_free_desc_area(char *start, char *end)
{
@@ -1164,6 +1165,39 @@ static void unreserve_noop(char *ptr, UWord size)
#endif
}
+static ERTS_INLINE UWord
+alloc_desc_insert_free_seg(ErtsFreeSegMap *map, char* start, char* end)
+{
+ UWord ad_sz;
+ char *new_end;
+ ErtsFreeSegDesc *desc = alloc_desc();
+ if (desc) {
+ insert_free_seg(map, desc, start, end);
+ return 0;
+ }
+
+ /* Use part of the free segment for descriptors */
+
+ if (map == &mmap_state.sa.map) {
+ ERTS_MMAP_SIZE_SC_SA_INC(ERTS_SUPERALIGNED_SIZE);
+ ad_sz = ERTS_SUPERALIGNED_SIZE;
+ }
+ else {
+ ERTS_MMAP_SIZE_SC_SUA_INC(ERTS_PAGEALIGNED_SIZE);
+ ad_sz = ERTS_PAGEALIGNED_SIZE;
+ }
+
+ new_end = end - ad_sz;
+ ERTS_MMAP_ASSERT(start <= new_end);
+ if (start != new_end) {
+ desc = alloc_desc();
+ ERTS_MMAP_ASSERT(desc);
+ insert_free_seg(map, desc, start, new_end);
+ }
+
+ return ad_sz;
+}
+
void *
erts_mmap(Uint32 flags, UWord *sizep)
{
@@ -1248,6 +1282,7 @@ erts_mmap(Uint32 flags, UWord *sizep)
end = seg + asize;
if (!mmap_state.reserve_physical(seg, asize))
goto supercarrier_reserve_failure;
+ ERTS_MMAP_SIZE_SC_SUA_INC(asize);
if (org_start != seg) {
ERTS_MMAP_ASSERT(org_start < seg);
resize_free_seg(&mmap_state.sua.map, desc, org_start, seg);
@@ -1257,15 +1292,10 @@ erts_mmap(Uint32 flags, UWord *sizep)
ERTS_MMAP_ASSERT(end < org_end);
if (desc)
resize_free_seg(&mmap_state.sua.map, desc, end, org_end);
- else {
- desc = alloc_desc();
- if (!desc)
- add_free_desc_area(end, org_end);
- else
- insert_free_seg(&mmap_state.sua.map, desc, end, org_end);
- }
+ else
+ alloc_desc_insert_free_seg(&mmap_state.sua.map,
+ end, org_end);
}
- ERTS_MMAP_SIZE_SC_SA_INC(asize);
goto supercarrier_success;
}
}
@@ -1361,6 +1391,7 @@ erts_munmap(Uint32 flags, void **ptrp, UWord *sizep)
char *start, *end;
ErtsFreeSegMap *map;
ErtsFreeSegDesc *prev, *next, *desc;
+ UWord ad_sz = 0;
ERTS_MMAP_ASSERT(mmap_state.supercarrier);
@@ -1432,23 +1463,19 @@ erts_munmap(Uint32 flags, void **ptrp, UWord *sizep)
if (desc)
resize_free_seg(map, desc, start, end);
- else {
- desc = alloc_desc();
- if (desc)
- insert_free_seg(map, desc, start, end);
- else {
- if (map == &mmap_state.sa.map)
- ERTS_MMAP_SIZE_SC_SA_INC(size);
- else
- ERTS_MMAP_SIZE_SC_SUA_INC(size);
- add_free_desc_area(start, end);
- }
- }
+ else
+ ad_sz = alloc_desc_insert_free_seg(map, start, end);
+
+ supercarrier_success: {
+ UWord unres_sz;
- supercarrier_success:
- erts_smp_mtx_unlock(&mmap_state.mtx);
+ erts_smp_mtx_unlock(&mmap_state.mtx);
- mmap_state.unreserve_physical((char *) ptr, size);
+ ERTS_MMAP_ASSERT(size >= ad_sz);
+ unres_sz = size - ad_sz;
+ if (unres_sz)
+ mmap_state.unreserve_physical((char *) ptr, unres_sz);
+ }
}
}
@@ -1548,7 +1575,8 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
else { /* In super carrier */
char *start, *end, *new_end;
ErtsFreeSegMap *map;
- ErtsFreeSegDesc *prev, *next, *desc;
+ ErtsFreeSegDesc *prev, *next;
+ UWord ad_sz = 0;
ERTS_MMAP_ASSERT(mmap_state.supercarrier);
@@ -1586,6 +1614,7 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
new_end = start+asize;
if (asize < old_size) {
+ UWord unres_sz;
new_ptr = ptr;
if (!ERTS_MMAP_IN_SUPERALIGNED_AREA(ptr)) {
ERTS_MMAP_ASSERT(ERTS_IS_PAGEALIGNED(ptr));
@@ -1620,21 +1649,13 @@ erts_mremap(Uint32 flags, void *ptr, UWord old_size, UWord *sizep)
if (next)
resize_free_seg(map, next, new_end, next->end);
- else {
- desc = alloc_desc();
- if (desc)
- insert_free_seg(map, desc, new_end, end);
- else {
- if (map == &mmap_state.sa.map)
- ERTS_MMAP_SIZE_SC_SA_INC(old_size - asize);
- else
- ERTS_MMAP_SIZE_SC_SUA_INC(old_size - asize);
- add_free_desc_area(new_end, end);
- goto supercarrier_resize_success;
- }
- }
- mmap_state.unreserve_physical(((char *) ptr) + asize,
- old_size - asize);
+ else
+ ad_sz = alloc_desc_insert_free_seg(map, new_end, end);
+ ERTS_MMAP_ASSERT(old_size - asize >= ad_sz);
+ unres_sz = old_size - asize - ad_sz;
+ if (unres_sz)
+ mmap_state.unreserve_physical(((char *) ptr) + asize,
+ unres_sz);
goto supercarrier_resize_success;
}
@@ -1921,7 +1942,6 @@ erts_mmap_init(ErtsMMapInit *init)
#endif
}
-
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\
* Debug functions *
\* */