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extend ctrl process memory cache reads with freshness info - it is a bit too coarse grained at page granularity, that should've been easy to predict... in any case, to start addressing that, start keeping >1 hash key hash history in hash store layer, such that history may be preserved for a bit longer & diff'd with new key hashes

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This commit is contained in:
Ryan Fleury
2024-01-25 09:06:03 -08:00
parent 76b2facbf4
commit d0c3d9dc21
8 changed files with 93 additions and 39 deletions
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src/ctrl/ctrl_core.c
+20 -9
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@@ -754,10 +754,10 @@ ctrl_process_read(CTRL_MachineID machine_id, CTRL_Handle process, Rng1U64 range,
return actual_bytes_read;
}
internal String8
internal CTRL_ProcessMemorySlice
ctrl_query_cached_data_from_process_vaddr_range(Arena *arena, CTRL_MachineID machine_id, CTRL_Handle process, Rng1U64 range)
{
String8 result = {0};
CTRL_ProcessMemorySlice result = {0};
if(range.max > range.min &&
dim_1u64(range) <= MB(256) &&
range.min <= 0x000FFFFFFFFFFFFFull &&
@@ -821,6 +821,7 @@ ctrl_query_cached_data_from_process_vaddr_range(Arena *arena, CTRL_MachineID mac
{
page_found = 1;
MemoryCopy((U8*)read_out + (page_vaddr-page_range.min), page_data.str, KB(4));
result.fresh = result.fresh || !!(node4->page_fresh_flags[lvl5_idx/64] & (1ull<<(lvl5_idx%64)));
}
else
{
@@ -898,6 +899,16 @@ ctrl_query_cached_data_from_process_vaddr_range(Arena *arena, CTRL_MachineID mac
};
U128 page_key = hs_hash_from_data(str8((U8 *)page_key_data, sizeof(page_key_data)));
U128 page_hash = hs_submit_data(page_key, &page_arena, str8((U8 *)page_base, KB(4)));
if(!u128_match(node4->page_hashes[lvl5_idx], u128_zero()) &&
!u128_match(node4->page_hashes[lvl5_idx], page_hash))
{
node4->page_fresh_flags[lvl5_idx/64] |= (1ull<<(lvl5_idx%64));
}
else
{
node4->page_fresh_flags[lvl5_idx/64] &= ~(1ull<<(lvl5_idx%64));
}
result.fresh = result.fresh || !!(node4->page_fresh_flags[lvl5_idx/64] & (1ull<<(lvl5_idx%64)));
node4->page_hashes[lvl5_idx] = page_hash;
}
else
@@ -910,22 +921,22 @@ ctrl_query_cached_data_from_process_vaddr_range(Arena *arena, CTRL_MachineID mac
//- rjf: fill result by skipping/chopping read memory
U64 byte_in_page_idx = (range.min&0x0000000000000FFFull) >> 0;
result.str = (U8*)read_out + byte_in_page_idx;
result.size = dim_1u64(range);
result.data.str = (U8*)read_out + byte_in_page_idx;
result.data.size = dim_1u64(range);
hs_scope_close(scope);
}
return result;
}
internal String8
internal CTRL_ProcessMemorySlice
ctrl_query_cached_zero_terminated_data_from_process_vaddr_limit(Arena *arena, CTRL_MachineID machine_id, CTRL_Handle process, U64 vaddr, U64 limit, U64 endt_us)
{
String8 result = ctrl_query_cached_data_from_process_vaddr_range(arena, machine_id, process, r1u64(vaddr, vaddr+limit));
for(U64 idx = 0; idx < result.size; idx += 1)
CTRL_ProcessMemorySlice result = ctrl_query_cached_data_from_process_vaddr_range(arena, machine_id, process, r1u64(vaddr, vaddr+limit));
for(U64 idx = 0; idx < result.data.size; idx += 1)
{
if(result.str[idx] == 0)
if(result.data.str[idx] == 0)
{
result.size = idx;
result.data.size = idx;
break;
}
}