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arch-riscv: adding stats to show completed page walks (#869)

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This commit adds statistics showing completed page walks for 4KB and 2MB
pages. This will add to stats.txt the variables num_4kb_walks,
num_2mb_walks and the corresponding values. This is done based on the
level of page table walk traversed specific to Sv39 Virtual Memory
System.
This commit is contained in:
Nitish Arya
2024-03-04 17:38:28 +01:00
committed by GitHub
parent c57a6b0d59
commit 676d571009
2 changed files with 36 additions and 1 deletions
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23
src/arch/riscv/pagetable_walker.cc
View File

@@ -391,6 +391,9 @@ Walker::WalkerState::stepWalk(PacketPtr &write)
}
// perform step 8 only if pmp checks pass
if (fault == NoFault) {
DPRINTF(PageTableWalker,
"#0 leaf node at level %d, with vpn %#x\n",
level, entry.vaddr);
// step 8
entry.logBytes = PageShift + (level * LEVEL_BITS);
@@ -403,6 +406,17 @@ Walker::WalkerState::stepWalk(PacketPtr &write)
if (!pte.d && mode != BaseMMU::Write)
entry.pte.w = 0;
doTLBInsert = true;
// Update statistics for completed page walks
if (level == 1) {
walker->pagewalkerstats.num_2mb_walks++;
}
if (level == 0) {
walker->pagewalkerstats.num_4kb_walks++;
}
DPRINTF(PageTableWalker,
"#1 leaf node at level %d, with vpn %#x\n",
level, entry.vaddr);
}
}
} else {
@@ -649,5 +663,14 @@ Walker::WalkerState::pageFault(bool present)
return walker->tlb->createPagefault(entry.vaddr, mode);
}
Walker::PagewalkerStats::PagewalkerStats(statistics::Group *parent)
: statistics::Group(parent),
ADD_STAT(num_4kb_walks, statistics::units::Count::get(),
"Completed page walks with 4KB pages"),
ADD_STAT(num_2mb_walks, statistics::units::Count::get(),
"Completed page walks with 2MB pages")
{
}
} // namespace RiscvISA
} // namespace gem5

14
src/arch/riscv/pagetable_walker.hh
View File

@@ -46,6 +46,7 @@
#include "arch/riscv/pma_checker.hh"
#include "arch/riscv/pmp.hh"
#include "arch/riscv/tlb.hh"
#include "base/statistics.hh"
#include "base/types.hh"
#include "mem/packet.hh"
#include "params/RiscvPagetableWalker.hh"
@@ -193,6 +194,16 @@ namespace RiscvISA
void recvReqRetry();
bool sendTiming(WalkerState * sendingState, PacketPtr pkt);
struct PagewalkerStats : public statistics::Group
{
PagewalkerStats(statistics::Group *parent);
statistics::Scalar num_4kb_walks;
statistics::Scalar num_2mb_walks;
} pagewalkerstats;
public:
void setTLB(TLB * _tlb)
@@ -209,7 +220,8 @@ namespace RiscvISA
pmp(params.pmp),
requestorId(sys->getRequestorId(this)),
numSquashable(params.num_squash_per_cycle),
startWalkWrapperEvent([this]{ startWalkWrapper(); }, name())
startWalkWrapperEvent([this]{ startWalkWrapper(); }, name()),
pagewalkerstats(this)
{
}
};