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From bbd5a5c1f5db3bde04628e75396155260333e53e Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Wed, 19 Jan 2022 16:24:49 +0900
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Subject: [PATCH 08/11] Remove ptype command from "ps -t" option to reduce
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memory and time
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With some vmlinux e.g. RHEL9 ones, the first execution of the gdb ptype
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command heavily consumes memory and time. The "ps -t" option uses it in
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start_time_timespec(), and it can be replaced with the crash macros.
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This can reduce about 1.4 GB memory and 6 seconds time comsumption in
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the following test:
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$ echo "ps -t" | time crash vmlinux vmcore
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Without the patch:
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11.60user 0.43system 0:11.94elapsed 100%CPU (0avgtext+0avgdata 1837964maxresident)k
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0inputs+400outputs (0major+413636minor)pagefaults 0swaps
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With the patch:
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5.40user 0.16system 0:05.46elapsed 101%CPU (0avgtext+0avgdata 417896maxresident)k
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0inputs+384outputs (0major+41528minor)pagefaults 0swaps
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Although the ptype command and similar ones cannot be fully removed,
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but removing some of them will make the use of crash safer, especially
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for an automatic crash reporter.
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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task.c | 25 +++++--------------------
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1 file changed, 5 insertions(+), 20 deletions(-)
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diff --git a/task.c b/task.c
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index 263a8344dd94..a79ed0d96fb5 100644
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--- a/task.c
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+++ b/task.c
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@@ -4662,8 +4662,6 @@ show_task_times(struct task_context *tcp, ulong flags)
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static int
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start_time_timespec(void)
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{
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- char buf[BUFSIZE];
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-
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switch(tt->flags & (TIMESPEC | NO_TIMESPEC | START_TIME_NSECS))
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{
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case TIMESPEC:
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@@ -4677,24 +4675,11 @@ start_time_timespec(void)
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tt->flags |= NO_TIMESPEC;
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- open_tmpfile();
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- sprintf(buf, "ptype struct task_struct");
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- if (!gdb_pass_through(buf, NULL, GNU_RETURN_ON_ERROR)) {
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- close_tmpfile();
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- return FALSE;
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- }
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-
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- rewind(pc->tmpfile);
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- while (fgets(buf, BUFSIZE, pc->tmpfile)) {
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- if (strstr(buf, "start_time;")) {
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- if (strstr(buf, "struct timespec")) {
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- tt->flags &= ~NO_TIMESPEC;
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- tt->flags |= TIMESPEC;
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- }
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- }
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- }
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-
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- close_tmpfile();
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+ if (VALID_MEMBER(task_struct_start_time) &&
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+ STREQ(MEMBER_TYPE_NAME("task_struct", "start_time"), "timespec")) {
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+ tt->flags &= ~NO_TIMESPEC;
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+ tt->flags |= TIMESPEC;
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+ }
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if ((tt->flags & NO_TIMESPEC) && (SIZE(task_struct_start_time) == 8)) {
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tt->flags &= ~NO_TIMESPEC;
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--
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2.20.1
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