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readahead: exit after a maximum runtime

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This commit is contained in:
Lennart Poettering 2010-09-25 14:27:16 +02:00
parent 902a339c93
commit 408b85df83
1 changed files with 30 additions and 9 deletions
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39
src/readahead-collect.c
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@ -49,12 +49,18 @@
#include "readahead-common.h"
#define MINCORE_VEC_SIZE (READAHEAD_FILE_SIZE_MAX/PAGE_SIZE)
#define TIMEOUT_USEC (2*USEC_PER_MINUTE)
/* fixme:
*
* - detect ssd/lvm/... on btrfs
* - detect ssd on btrfs/lvm...
* - read ahead directories
* - sd_readahead_cancel
* - gzip?
* - oom adjust
* - remount rw
* - are filenames from anotify normalized regards /../ and // and /./?
* - does ioprio_set work with fadvise()?
*/
static int btrfs_defrag(int fd) {
@ -111,7 +117,7 @@ static int pack_file(FILE *pack, const char *fn, bool on_btrfs) {
pages = l / PAGE_SIZE;
mapped = false;
for (c = 0; c < pages; c++) {
bool new_mapped = (vec[c] & 1);
bool new_mapped = !!(vec[c] & 1);
if (!mapped && new_mapped)
b = c;
@ -206,6 +212,7 @@ static int collect(const char *root) {
char *pack_fn_new = NULL, *pack_fn = NULL;
bool on_ssd, on_btrfs;
struct statfs sfs;
usec_t not_after;
assert(root);
@ -228,7 +235,7 @@ static int collect(const char *root) {
goto finish;
}
if ((fanotify_fd = fanotify_init(FAN_CLOEXEC, O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOATIME)) < 0) {
if ((fanotify_fd = fanotify_init(FAN_CLOEXEC|FAN_NONBLOCK, O_RDONLY|O_LARGEFILE|O_CLOEXEC|O_NOATIME)) < 0) {
log_error("Failed to create fanotify object: %m");
r = -errno;
goto finish;
@ -240,6 +247,8 @@ static int collect(const char *root) {
goto finish;
}
not_after = now(CLOCK_MONOTONIC) + TIMEOUT_USEC;
my_pid = getpid();
zero(pollfd);
@ -261,11 +270,21 @@ static int collect(const char *root) {
} data;
ssize_t n;
struct fanotify_event_metadata *m;
usec_t t;
int h;
if (hashmap_size(files) > READAHEAD_FILES_MAX)
if (hashmap_size(files) > READAHEAD_FILES_MAX) {
log_debug("Reached maximum number of read ahead files, ending collection.");
break;
}
if (poll(pollfd, _FD_MAX, -1) < 0) {
t = now(CLOCK_MONOTONIC);
if (t >= not_after) {
log_debug("Reached maximum collection time, ending collection.");
break;
}
if ((h = poll(pollfd, _FD_MAX, (int) ((not_after - t) / USEC_PER_MSEC))) < 0) {
if (errno == EINTR)
continue;
@ -278,6 +297,11 @@ static int collect(const char *root) {
if (pollfd[FD_SIGNAL].revents != 0)
break;
if (h == 0) {
log_debug("Reached maximum collection time, ending collection.");
break;
}
if ((n = read(fanotify_fd, &data, sizeof(data))) < 0) {
if (errno == EINTR || errno == EAGAIN)
@ -288,8 +312,7 @@ static int collect(const char *root) {
goto finish;
}
m = &data.metadata;
while (FAN_EVENT_OK(m, n)) {
for (m = &data.metadata; FAN_EVENT_OK(m, n); m = FAN_EVENT_NEXT(m, n)) {
if (m->pid != my_pid && m->fd >= 0) {
char fn[PATH_MAX];
@ -320,8 +343,6 @@ static int collect(const char *root) {
if (m->fd)
close_nointr_nofail(m->fd);
m = FAN_EVENT_NEXT(m, n);
}
}