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improve cache behavior of gralloc allocations on qsd8k

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make sure to use cached buffers only when frequent cpu access is needed.
also, always flush buffers after they are allocated and cleared.
This commit is contained in:
Mathias Agopian
2009-12-08 19:34:43 -08:00
parent 148f11328f
commit e17d093d0c
1 changed files with 13 additions and 3 deletions
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16
libgralloc-qsd8k/gralloc.cpp
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@ -279,9 +279,16 @@ try_ashmem:
err = -ENOMEM;
} else {
struct pmem_region sub = { offset, size };
int openFlags = O_RDWR | O_SYNC;
uint32_t uread = usage & GRALLOC_USAGE_SW_READ_MASK;
uint32_t uwrite = usage & GRALLOC_USAGE_SW_WRITE_MASK;
if (uread == GRALLOC_USAGE_SW_READ_OFTEN ||
uwrite == GRALLOC_USAGE_SW_WRITE_OFTEN) {
openFlags &= ~O_SYNC;
}
// now create the "sub-heap"
fd = open("/dev/pmem", O_RDWR, 0);
fd = open("/dev/pmem", openFlags, 0);
err = fd < 0 ? fd : 0;
// and connect to it
@ -297,8 +304,11 @@ try_ashmem:
close(fd);
sAllocator.deallocate(offset);
fd = -1;
} else {
memset((char*)base + offset, 0, size);
// clean and invalidate the new allocation
cacheflush(intptr_t(base) + offset, size, 0);
}
memset((char*)base + offset, 0, size);
//LOGD_IF(!err, "allocating pmem size=%d, offset=%d", size, offset);
}
} else {