tools/map.cpp | 44 +++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 43 insertions(+), 1 deletion(-)
New commits:
commit 2fb4521a9cd296163c87c7f24e3b3d9bd9966dd8
Author: Michael Meeks <michael.me...@collabora.com>
Date: Tue Nov 28 18:08:26 2017 +0000
Dump unshared heap memory ascii-art map by page..
Change-Id: I21ef386958e651b53b4d8eef434958a20adcbe68
diff --git a/tools/map.cpp b/tools/map.cpp
index 7bab3f17..cd7fd788 100644
--- a/tools/map.cpp
+++ b/tools/map.cpp
@@ -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)
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