[scudo][standalone] Various improvements wrt RSS
Summary:
This patch includes several changes to reduce the overall footprint
of the allocator:
- for realloc'd chunks: only keep the same chunk when lowering the size
if the delta is within a page worth of bytes;
- when draining a cache: drain the beginning, not the end; we add pointers
at the end, so that meant we were draining the most recently added
pointers;
- change the release code to account for an freed up last page: when
scanning the pages, we were looking for pages fully covered by blocks;
in the event of the last page, if it's only partially covered, we
wouldn't mark it as releasable - even what follows the last chunk is
all 0s. So now mark the rest of the page as releasable, and adapt the
test;
- add a missing `setReleaseToOsIntervalMs` to the cacheless secondary;
- adjust the Android classes based on more captures thanks to pcc@'s
tool.
Reviewers: pcc, cferris, hctim, eugenis
Subscribers: #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D75142
GitOrigin-RevId: c753a306fd1ad4a7e5c61367225abce86ac29cd7
diff --git a/size_class_map.h b/size_class_map.h
index 3bbd165..5ed8e28 100644
--- a/size_class_map.h
+++ b/size_class_map.h
@@ -170,39 +170,37 @@
struct AndroidSizeClassConfig {
#if SCUDO_WORDSIZE == 64U
- // Measured using a system_server profile.
static const uptr NumBits = 7;
static const uptr MinSizeLog = 4;
static const uptr MidSizeLog = 6;
static const uptr MaxSizeLog = 16;
static const u32 MaxNumCachedHint = 14;
- static const uptr MaxBytesCachedLog = 14;
+ static const uptr MaxBytesCachedLog = 13;
static constexpr u32 Classes[] = {
- 0x00020, 0x00030, 0x00040, 0x00050, 0x00060, 0x00070, 0x00090, 0x000a0,
- 0x000b0, 0x000e0, 0x00110, 0x00130, 0x001a0, 0x00240, 0x00320, 0x00430,
- 0x00640, 0x00830, 0x00a10, 0x00c30, 0x01010, 0x01150, 0x01ad0, 0x02190,
- 0x03610, 0x04010, 0x04510, 0x04d10, 0x05a10, 0x07310, 0x09610, 0x10010,
+ 0x00020, 0x00030, 0x00040, 0x00050, 0x00060, 0x00070, 0x00090, 0x000b0,
+ 0x000c0, 0x000e0, 0x00120, 0x00160, 0x001c0, 0x00250, 0x00320, 0x00450,
+ 0x00670, 0x00830, 0x00a10, 0x00c30, 0x01010, 0x01210, 0x01bd0, 0x02210,
+ 0x02d90, 0x03790, 0x04010, 0x04810, 0x05a10, 0x07310, 0x08210, 0x10010,
};
static const uptr SizeDelta = 16;
#else
- // Measured using a dex2oat profile.
static const uptr NumBits = 8;
static const uptr MinSizeLog = 4;
- static const uptr MidSizeLog = 8;
+ static const uptr MidSizeLog = 7;
static const uptr MaxSizeLog = 16;
static const u32 MaxNumCachedHint = 14;
- static const uptr MaxBytesCachedLog = 14;
+ static const uptr MaxBytesCachedLog = 13;
static constexpr u32 Classes[] = {
0x00020, 0x00030, 0x00040, 0x00050, 0x00060, 0x00070, 0x00080, 0x00090,
- 0x000a0, 0x000b0, 0x000c0, 0x000d0, 0x000e0, 0x000f0, 0x00100, 0x00110,
- 0x00120, 0x00140, 0x00150, 0x00170, 0x00190, 0x001c0, 0x001f0, 0x00220,
- 0x00240, 0x00260, 0x002a0, 0x002e0, 0x00310, 0x00340, 0x00380, 0x003b0,
- 0x003e0, 0x00430, 0x00490, 0x00500, 0x00570, 0x005f0, 0x00680, 0x00720,
- 0x007d0, 0x00890, 0x00970, 0x00a50, 0x00b80, 0x00cb0, 0x00e30, 0x00fb0,
- 0x011b0, 0x01310, 0x01470, 0x01790, 0x01b50, 0x01fd0, 0x02310, 0x02690,
- 0x02b10, 0x02fd0, 0x03610, 0x03e10, 0x04890, 0x05710, 0x06a90, 0x10010,
+ 0x000a0, 0x000b0, 0x000c0, 0x000e0, 0x000f0, 0x00110, 0x00120, 0x00130,
+ 0x00150, 0x00160, 0x00170, 0x00190, 0x001d0, 0x00210, 0x00240, 0x002a0,
+ 0x00330, 0x00370, 0x003a0, 0x00400, 0x00430, 0x004a0, 0x00530, 0x00610,
+ 0x00730, 0x00840, 0x00910, 0x009c0, 0x00a60, 0x00b10, 0x00ca0, 0x00e00,
+ 0x00fb0, 0x01030, 0x01130, 0x011f0, 0x01490, 0x01650, 0x01930, 0x02010,
+ 0x02190, 0x02490, 0x02850, 0x02d50, 0x03010, 0x03210, 0x03c90, 0x04090,
+ 0x04510, 0x04810, 0x05c10, 0x06f10, 0x07310, 0x08010, 0x0c010, 0x10010,
};
static const uptr SizeDelta = 16;
#endif
