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Report up-to-date RSS in LMK_PROCKILL cmd 

Add RSS field, in LMK_PROCKILL cmd, to report the latest memory usage of
the killed process.

Test: Verified RSS field is captured in ApplicationExitInfo
Bug: 322549716
Change-Id: Ic1788e8121da97cd879bd7e9d685c7b879ea5475
Signed-off-by: Carlos Galo <carlosgalo@google.com>
This commit is contained in:
Carlos Galo 2024-07-10 20:06:12 +00:00
parent 0aeff477af
commit 1e50c6ecc4
2 changed files with 12 additions and 7 deletions
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7
include/lmkd.h
View File

@ -245,11 +245,14 @@ static inline size_t lmkd_pack_set_subscribe(LMKD_CTRL_PACKET packet, enum async
* Prepare LMK_PROCKILL unsolicited packet and return packet size in bytes.
* Warning: no checks performed, caller should ensure valid parameters.
*/
static inline size_t lmkd_pack_set_prockills(LMKD_CTRL_PACKET packet, pid_t pid, uid_t uid) {
static inline size_t lmkd_pack_set_prockills(LMKD_CTRL_PACKET packet, pid_t pid, uid_t uid,
int rss_kb) {
packet[0] = htonl(LMK_PROCKILL);
packet[1] = htonl(pid);
packet[2] = htonl(uid);
return 3 * sizeof(int);
packet[3] = htonl(rss_kb);
return 4 * sizeof(int);
}
/*

12
lmkd.cpp
View File

@ -807,9 +807,9 @@ static int ctrl_data_write(int dsock_idx, char* buf, size_t bufsz) {
* Write the pid/uid pair over the data socket, note: all active clients
* will receive this unsolicited notification.
*/
static void ctrl_data_write_lmk_kill_occurred(pid_t pid, uid_t uid) {
static void ctrl_data_write_lmk_kill_occurred(pid_t pid, uid_t uid, int64_t rss_kb) {
LMKD_CTRL_PACKET packet;
size_t len = lmkd_pack_set_prockills(packet, pid, uid);
size_t len = lmkd_pack_set_prockills(packet, pid, uid, static_cast<int>(rss_kb));
for (int i = 0; i < MAX_DATA_CONN; i++) {
if (data_sock[i].sock >= 0 && data_sock[i].async_event_mask & 1 << LMK_ASYNC_EVENT_KILL) {
@ -866,6 +866,7 @@ static void poll_kernel(int poll_fd) {
int16_t min_score_adj;
int64_t starttime;
char* taskname = 0;
int64_t rss_kb;
int fields_read =
sscanf(rd_buf,
@ -876,9 +877,10 @@ static void poll_kernel(int poll_fd) {
/* only the death of the group leader process is logged */
if (fields_read == 10 && group_leader_pid == pid) {
ctrl_data_write_lmk_kill_occurred((pid_t)pid, (uid_t)uid);
mem_st.process_start_time_ns = starttime * (NS_PER_SEC / sysconf(_SC_CLK_TCK));
mem_st.rss_in_bytes = rss_in_pages * pagesize;
rss_kb = mem_st.rss_in_bytes >> 10;
ctrl_data_write_lmk_kill_occurred((pid_t)pid, (uid_t)uid, rss_kb);
mem_st.process_start_time_ns = starttime * (NS_PER_SEC / sysconf(_SC_CLK_TCK));
struct kill_stat kill_st = {
.uid = static_cast<int32_t>(uid),
@ -2682,7 +2684,7 @@ static int kill_one_process(struct proc* procp, int min_oom_score, struct kill_i
kill_st.free_swap_kb = get_free_swap(mi) * page_k;
stats_write_lmk_kill_occurred(&kill_st, mem_st);
ctrl_data_write_lmk_kill_occurred((pid_t)pid, uid);
ctrl_data_write_lmk_kill_occurred((pid_t)pid, uid, rss_kb);
result = rss_kb / page_k;