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Dump unshared heap memory ascii-art map by page..

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Change-Id: I21ef386958e651b53b4d8eef434958a20adcbe68
This commit is contained in:
Michael Meeks 2017-11-28 18:08:26 +00:00
parent 5540fc0b7f
commit 2fb4521a9c
1 changed files with 43 additions and 1 deletions
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44
tools/map.cpp
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@ -23,6 +23,7 @@
#include <dirent.h>
#include <locale.h>
typedef unsigned long long addr_t;
#define MAP_SIZE 20
#define PATH_SIZE 1000 // No harm in having it much larger than strictly necessary. Avoids compiler warning.
@ -79,12 +80,52 @@ static int read_buffer(char *buffer, unsigned size,
return total_bytes;
}
static void dump_unshared(unsigned proc_id, const std::vector<addr_t> &heapVAddresses)
{
char path_proc[PATH_SIZE];
snprintf(path_proc, sizeof(path_proc), "/proc/%d/pagemap", proc_id);
int fd = open(path_proc, 0);
if (fd < 0)
error(EXIT_FAILURE, errno, "Failed to open %s", path_proc);
printf("Sharing map:\n");
addr_t numShared = 0, numOwn = 0;
for (auto p : heapVAddresses)
{
if (lseek(fd, (p / 0x1000 * 8), SEEK_SET) < 0)
error(EXIT_FAILURE, errno, "Failed to seek in pagemap");
addr_t vaddrData;
if (read(fd, &vaddrData, 8) < 0)
error(EXIT_FAILURE, errno, "Failed to read vaddrdata");
{
// https://patchwork.kernel.org/patch/6787921/
// fprintf(stderr, "addr: 0x%8llx bits: 0x%8llx : %s\n", p, vaddrData,
// (vaddrData & ((addr_t)1 << 56)) ? "unshared" : "shared");
if (vaddrData & ((addr_t)1 << 56))
{
numOwn++;
printf("*");
}
else
{
numShared++;
printf(".");
}
}
if (!((numShared + numOwn) % 128))
printf("\n");
}
printf ("\nTotals:\n");
printf ("\tshared %5lld (%lldkB)\n", numShared, numShared * 4);
printf ("\tunshared %5lld (%lldkB)\n", numOwn, numOwn * 4);
}
static void total_smaps(unsigned proc_id, const char *file, const char *cmdline)
{
FILE *file_pointer;
char buffer[BUFFER_SIZE];
typedef unsigned long long addr_t;
addr_t total_private_dirty = 0ull;
addr_t total_private_clean = 0ull;
addr_t total_shared_dirty = 0ull;
@ -154,6 +195,7 @@ static void total_smaps(unsigned proc_id, const char *file, const char *cmdline)
printf("--------------------------------------\n");
printf("Heap page cnt :%20lld\n", (addr_t)heapVAddresses.size());
printf("\n");
dump_unshared(proc_id, heapVAddresses);
}
int main(int argc, char **argv)