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Wrap calls from ebpf_drv.c in epoch calls #2189

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merged 4 commits into from
Mar 22, 2023
Merged

Wrap calls from ebpf_drv.c in epoch calls #2189

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96d5054
Replace dynamically sized thread table with fixed
Alan-Jowett Mar 16, 2023
675fe74
Isolate hash-table search logic
Alan-Jowett Mar 22, 2023
af0f635
Fix code analysis failure and test failure
Alan-Jowett Mar 22, 2023
b340eca
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Alan-Jowett Mar 22, 2023
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Signed-off-by: Alan Jowett <alanjo@microsoft.com>
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Alan-Jowett committed Mar 22, 2023
commit b340eca20b8b6a87005117638a9710fed9dffd69
4 changes: 1 addition & 3 deletions libs/platform/ebpf_epoch.c
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Expand Up @@ -42,7 +42,7 @@
// If the stale flag is already set, then the per-CPU stale_worker is scheduled.
//
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// Thread entry table:
// The thread entry is a fixed size per-CPU hash table for tracking per-thread ebpf_epoch_state_t. The hash is
// The thread entry table is a fixed size per-CPU hash table for tracking per-thread ebpf_epoch_state_t. The hash is
// based on the thread ID. The thread entry table is protected by a semaphore that limits the number of threads
// that can be active in the epoch at any one time. If a thread attempts to enter the epoch and the semaphore
// count is 0, then the thread blocks until a thread exits the epoch, which ensures that the thread entry table
Expand All @@ -59,8 +59,6 @@

#define EBPF_NANO_SECONDS_PER_FILETIME_TICK 100

#define EBPF_EPOCH_RESERVED_THREAD_ENTRY_COUNT 1

typedef struct _ebpf_epoch_state
{
int64_t epoch; // The highest epoch seen by this epoch state.
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