On (20/02/14 10:41), Sergey Senozhatsky wrote:
> On (20/02/13 23:36), John Ogness wrote:
[..]
> > We could implement it such that devkmsg_read() will skip over data-less
> > records instead of issuing an EPIPE. (That is what dmesg does.) But then
> > do we need EPIPE at all? The reader can see
On (20/02/13 23:36), John Ogness wrote:
> >> Here prb_read_valid() was successful, so a record _was_ read. The
> >> kerneldoc for the prb_read_valid() says:
> >
> > Hmm, yeah. That's true.
> >
> > OK, something weird...
> >
> > I ran some random printk-pressure test (mostly printks from IRQs;
> >
On (20/02/13 14:07), Petr Mladek wrote:
> On Wed 2020-02-05 17:12:12, John Ogness wrote:
> > On 2020-02-05, lijiang wrote:
> > > Do you have any suggestions about the size of CONFIG_LOG_* and
> > > CONFIG_PRINTK_* options by default?
> >
> > The new printk implementation consumes more than
On 2020-02-13, Sergey Senozhatsky wrote:
@@ -890,30 +758,26 @@ static ssize_t devkmsg_read(struct file *file, char
__user *buf,
logbuf_unlock_irq();
ret = wait_event_interruptible(log_wait,
- user->seq
On Wed 2020-02-05 17:12:12, John Ogness wrote:
> On 2020-02-05, lijiang wrote:
> > Do you have any suggestions about the size of CONFIG_LOG_* and
> > CONFIG_PRINTK_* options by default?
>
> The new printk implementation consumes more than double the memory that
> the current printk
On (20/02/13 10:42), John Ogness wrote:
> On 2020-02-13, Sergey Senozhatsky wrote:
> >> - while (user->seq == log_next_seq) {
> >> + if (!prb_read_valid(prb, user->seq, r)) {
> >>if (file->f_flags & O_NONBLOCK) {
> >>ret = -EAGAIN;
> >>
在 2020年02月13日 03:46, Bhupesh Sharma 写道:
> Hi Lianbo,
>
> Thanks for the patch.
>
> On Wed, Feb 12, 2020 at 6:27 PM Lianbo Jiang wrote:
>>
>> When loading kernel and initramfs for kexec, kexec-tools could get the
>> e820 reserved region from "/proc/iomem" in order to rebuild the e820
>> ranges
On 2020-02-13, Sergey Senozhatsky wrote:
>> -while (user->seq == log_next_seq) {
>> +if (!prb_read_valid(prb, user->seq, r)) {
>> if (file->f_flags & O_NONBLOCK) {
>> ret = -EAGAIN;
>> logbuf_unlock_irq();
>> @@ -890,30 +758,26 @@
On (20/01/28 17:25), John Ogness wrote:
[..]
> - while (user->seq == log_next_seq) {
> + if (!prb_read_valid(prb, user->seq, r)) {
> if (file->f_flags & O_NONBLOCK) {
> ret = -EAGAIN;
> logbuf_unlock_irq();
> @@ -890,30 +758,26 @@
