malloc: use large ZoneHigh when there is enough memory
In case there is enough memory installed use a large ZoneHigh. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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@ -17,7 +17,8 @@
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// Maximum number of map entries in the e820 map
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#define BUILD_MAX_E820 32
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// Space to reserve in high-memory for tables
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#define BUILD_MAX_HIGHTABLE (256*1024)
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#define BUILD_MIN_HIGHTABLE (256*1024)
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#define BUILD_MAX_HIGHTABLE (16*1024*1024)
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// Largest supported externaly facing drive id
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#define BUILD_MAX_EXTDRIVE 16
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// Number of bytes the smbios may be and still live in the f-segment
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14
src/malloc.c
14
src/malloc.c
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@ -423,7 +423,7 @@ malloc_preinit(void)
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// Populate temp high ram
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u32 highram_start = 0;
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u32 highram_size = BUILD_MAX_HIGHTABLE;
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u32 highram_size = 0;
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int i;
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for (i=e820_count-1; i>=0; i--) {
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struct e820entry *en = &e820_list[i];
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@ -434,10 +434,14 @@ malloc_preinit(void)
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continue;
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u32 s = en->start, e = end;
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if (!highram_start) {
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u32 newe = ALIGN_DOWN(e - highram_size, MALLOC_MIN_ALIGN);
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if (newe <= e && newe >= s) {
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highram_start = newe;
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e = newe;
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u32 new_max = ALIGN_DOWN(e - BUILD_MAX_HIGHTABLE, MALLOC_MIN_ALIGN);
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u32 new_min = ALIGN_DOWN(e - BUILD_MIN_HIGHTABLE, MALLOC_MIN_ALIGN);
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if (new_max <= e && new_max >= s + BUILD_MAX_HIGHTABLE) {
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highram_start = e = new_max;
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highram_size = BUILD_MAX_HIGHTABLE;
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} else if (new_min <= e && new_min >= s) {
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highram_start = e = new_min;
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highram_size = BUILD_MIN_HIGHTABLE;
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}
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}
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alloc_add(&ZoneTmpHigh, s, e);
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