diff options
Diffstat (limited to 'runtime/transport/utt.c')
| -rw-r--r-- | runtime/transport/utt.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/runtime/transport/utt.c b/runtime/transport/utt.c index b8281bb4..642fe240 100644 --- a/runtime/transport/utt.c +++ b/runtime/transport/utt.c @@ -27,6 +27,7 @@ #include <linux/init.h> #include <linux/debugfs.h> #include <linux/relay.h> +#include <linux/mm.h> #include "utt.h" static int utt_overwrite_flag = 0; @@ -292,6 +293,8 @@ struct utt_trace *utt_trace_setup(struct utt_trace_setup *utts) struct utt_trace *utt = NULL; struct dentry *dir = NULL; int ret = -EINVAL; + u64 npages; + struct sysinfo si; if (!utts->buf_size || !utts->buf_nr) goto err; @@ -313,6 +316,23 @@ struct utt_trace *utt_trace_setup(struct utt_trace_setup *utts) if (!utt->dropped_file) goto err; + npages = utts->buf_size * utts->buf_nr; + if (!utts->is_global) + npages *= num_possible_cpus(); + npages >>= PAGE_SHIFT; + si_meminfo(&si); +#define MB(i) (unsigned long)((i) >> (20 - PAGE_SHIFT)) + if (npages > (si.freeram + si.bufferram)) { + errk("Not enough free+buffered memory(%luMB) for log buffer\n", + MB(si.freeram + si.bufferram)); + ret = -ENOMEM; + goto err; + } else if (npages > si.freeram) { + printk("Warning: log buffer size exceeds free memory(%luMB)\n", + MB(si.freeram)); + /* exceeds freeram, but below freeram+bufferram */ + } + #if (RELAYFS_CHANNEL_VERSION >= 7) if (utts->is_global) utt->rchan = relay_open("trace", dir, utts->buf_size, utts->buf_nr, |