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feat: Add ACE allocation failure tracing and debug hooks

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This commit introduces a comprehensive tracing mechanism for allocation failures within the Adaptive Cache Engine (ACE) component. This feature allows for precise identification of the root cause for Out-Of-Memory (OOM) issues related to ACE allocations.

Key changes include:
- **ACE Tracing Implementation**:
  - Added  environment variable to enable/disable detailed logging of allocation failures.
  - Instrumented , , and  to distinguish between "Threshold" (size class mismatch), "Exhaustion" (pool depletion), and "MapFail" (OS memory allocation failure).
- **Build System Fixes**:
  - Corrected  to ensure  is properly linked into , resolving an  error.
- **LD_PRELOAD Wrapper Adjustments**:
  - Investigated and understood the  wrapper's behavior under , particularly its interaction with  and  checks.
  - Enabled debugging flags for  environment to prevent unintended fallbacks to 's  for non-tiny allocations, allowing comprehensive testing of the  allocator.
- **Debugging & Verification**:
  - Introduced temporary verbose logging to pinpoint execution flow issues within  interception and  routing. These temporary logs have been removed.
  - Created  to facilitate testing of the tracing features.

This feature will significantly aid in diagnosing and resolving allocation-related OOM issues in  by providing clear insights into the failure pathways.
This commit is contained in:
Moe Charm (CI)
2025-12-01 16:37:59 +09:00
parent 2bd8da9267
commit 4ef0171bc0
85 changed files with 5930 additions and 479 deletions
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22
core/hakmem_ace.c
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@ -1,5 +1,6 @@
#include <stdio.h>
#include "hakmem_internal.h"
#include "hakmem_config.h"
#include "hakmem_ace.h"
#include "hakmem_pool.h"
#include "hakmem_l25_pool.h"
@ -81,6 +82,13 @@ void* hkm_ace_alloc(size_t size, uintptr_t site_id, const FrozenPolicy* pol) {
HKM_TIME_END(HKM_CAT_POOL_GET, t_mid_get);
hkm_ace_stat_mid_attempt(p != NULL);
if (p) return p;
if (g_hakem_config.ace_trace) {
fprintf(stderr, "[ACE-FAIL] Exhaustion: size=%zu class=%zu (MidPool)\n", size, r);
}
} else {
if (g_hakem_config.ace_trace) {
fprintf(stderr, "[ACE-FAIL] Threshold: size=%zu wmax=%.2f (MidPool)\n", size, wmax_mid);
}
}
// If rounding not allowed or miss, fallthrough to large class rounding below
}
@ -94,6 +102,13 @@ void* hkm_ace_alloc(size_t size, uintptr_t site_id, const FrozenPolicy* pol) {
HKM_TIME_END(HKM_CAT_L25_GET, t_l25_get);
hkm_ace_stat_large_attempt(p != NULL);
if (p) return p;
if (g_hakem_config.ace_trace) {
fprintf(stderr, "[ACE-FAIL] Exhaustion: size=%zu class=%zu (LargePool)\n", size, r);
}
} else {
if (g_hakem_config.ace_trace) {
fprintf(stderr, "[ACE-FAIL] Threshold: size=%zu wmax=%.2f (LargePool)\n", size, wmax_large);
}
}
} else if (size > POOL_MAX_SIZE && size < L25_MIN_SIZE) {
// Gap 32–64KiB: try rounding up to 64KiB if permitted
@ -104,6 +119,13 @@ void* hkm_ace_alloc(size_t size, uintptr_t site_id, const FrozenPolicy* pol) {
HKM_TIME_END(HKM_CAT_L25_GET, t_l25_get2);
hkm_ace_stat_large_attempt(p != NULL);
if (p) return p;
if (g_hakem_config.ace_trace) {
fprintf(stderr, "[ACE-FAIL] Exhaustion: size=%zu class=64KB (Gap)\n", size);
}
} else {
if (g_hakem_config.ace_trace) {
fprintf(stderr, "[ACE-FAIL] Threshold: size=%zu wmax=%.2f (Gap)\n", size, wmax_large);
}
}
}